Intermittent fasting has become a popular weight loss trend in recent years. It involves fasting for a certain period, usually between 16-24 hours, followed by a period of normal eating. While many people swear by the effectiveness of intermittent fasting for weight loss, people often overlook the potential side effects of this diet. Any diet that requires extreme measures can lead to various negative consequences, and intermittent fasting is no exception.

While weight loss is essential to a healthy lifestyle, it should not come at the cost of one’s well-being. Therefore, sustainable measures promoting overall health and long-term weight management are crucial. The following sections of this article will delve into the side effects of intermittent fasting and why it is vital to pay attention to them. By understanding the potential risks, you can make an informed decision about whether intermittent fasting is the right approach for you or if more sustainable options are available.

Intermittent Fasting: An Overview

Intermittent fasting is a dietary approach that involves alternating between periods of eating and fasting. The concept of intermittent fasting is simple- alternating between eating and fasting, with regular periods of consuming little to no calories. There is a lot of focus on when you eat than on calorie restriction.

The eating window refers to consuming all your meals and snacks, while the fasting window is when you refrain from eating. Water and non caloric beverages like green tea or black coffee are allowed in the fasting window. There are different forms of intermittent fasting, each with its own eating and fasting windows. In addition, the length of the eating and fasting periods can vary depending on the chosen method of intermittent fasting. 

Some of the most popular variations include:

Time-Restricted Eating (TRE)

Time-restricted eating  involves restricting the time when meals are consumed within 24 hours. Typical eating times range from 4–12 hours, without caloric restriction. The most common form of TRE is 16:8, with 8 hours of eating window. It involves eating within a specific time frame every day, typically within an 8-hour window, and fasting for the remaining 16 hours. The eating and fasting windows can suit individual preferences and lifestyles. Other variations of TRE include 18:6 and 20:4 eating schedules. TRE reduces insulin levels, boosts metabolism, and improves overall health.

Alternate Day Fasting (ADF)

ADF involves eating as usual for one day, followed by a day of fasting, and so on. Some people modify ADF by consuming around 25% of their daily calories (about 500 calories) on their fasting days. As a result, ADF can help with weight loss and improve insulin sensitivity.

The 5:2 Diet

The 5:2 diet involves eating normally five days a week and consuming only 500–800 calories on the remaining two days. This form of intermittent fasting shows to be effective for weight loss, improving energy levels, and reducing inflammation.

Eat-Stop-Eat

This intermediate fasting involves fasting for 24 hours once or twice a week.

The Warrior Diet

It involves fasting during the day and eating a larger meal at night.

Summary

Intermittent fasting is a dietary approach that involves alternating between periods of eating and fasting. The timing of the food is as important as the quality of food. Different forms of intermittent fasting include time-restricted eating, alternate-day fasting, the 5:2 diet, eat-stop-eat, and the warrior diet. Each has its own eating and fasting windows, with varying lengths. Intermittent fasting can have several health benefits, including weight loss, improved metabolism, and reduced inflammation.

Why do People Choose Intermittent Fasting?

Intermittent fasting has gained popularity as an eating pattern for numerous reasons. Below are some of the most common reasons why people choose intermittent fasting.

Weight Loss

One of the main reasons people choose intermittent fasting is for weight loss. It is a highly effective tool for reducing overall calorie intake, which can lead to weight loss.

Improved Energy and Focus

Fasting gives the body a break from digesting food, which allows it to focus on healing and detoxifying. It can also improve energy levels and mental clarity, improving focus and productivity.

Better Metabolic Health

Research shows intermittent fasting can help regulate hormones and insulin levels, leading to better metabolic health. It can also aid in fat burning, benefiting those looking to lose weight.

Improved Digestion

Intermittent fasting can give the digestive system a break, allowing it to work more efficiently. In addition, it can lead to improved digestion and reduced inflammation.

Reduced Inflammation

Research shows intermittent fasting can reduce inflammation, lowering the risk of certain diseases like heart disease.

Benefits for Those with High Blood Sugar

Intermittent fasting can help regulate insulin levels and improve glucose uptake, making it beneficial for those with high blood sugar. It can also help reduce blood sugar levels and manage appetite.

Benefits for Athletes

Intermittent fasting can optimise muscle recovery and reduce fat burning during exercise, improving sports performance.

Summary

Intermittent fasting has gained popularity for a variety of reasons. It can aid in weight loss, improve energy levels and focus, benefit metabolic health, aid digestion, reduce inflammation, help those with high blood sugar, and benefit athletes. However, any restrictive diet, including intermittent fasting, can lead to side effects if followed for too long. Therefore, adopting sustainable and long-term measures for weight loss and overall health is crucial. While intermittent fasting may offer benefits, it is important to weigh them against the potential risks and decide whether it is right for you.

10 Unavoidable Side Effects of Intermittent Fasting

Before selecting an intermittent fasting plan, it’s crucial to consult a medical professional about its potential side effects. Although some strategies may cause more side effects than others, knowing the top ten common side effects can assist you in managing them efficiently.

Unhealthy Eating Habits

Healthy eating habits are crucial for maintaining overall health and well-being. Fasting may result in unhealthy food cravings, particularly for sugary, ultra-processed snacks. Instead of fasting to maintain a healthy weight, it is better to establish sustainable eating habits that include nutrient-dense foods. Planning healthy snacks and incorporating them into your diet can help you achieve your health goals without risking your health. Therefore, it is advisable to avoid extreme dieting methods like fasting and focus on developing healthy, long-term habits.

Hunger and Cravings

While intermittent fasting has gained popularity, it is essential to note that it can sometimes increase appetite and cravings for food. In addition, when starting fasting, the body may take time to adjust to the new routine, leading to increased hunger. A study on obese adults showed that the 5:2 diet and calorie restriction resulted in similar weight loss and heart health benefits, but the 5:2 group reported more hunger. 

Paying attention to your body and adjusting your fasting schedule accordingly is essential. For example, shortening the fasting window or eating a limited amount during the fast can help reduce hunger. Remember, choosing a sustainable weight loss approach that works best for you is crucial.

Headache

Your body needs time to adjust when you start intermittent fasting, and it’s not uncommon to experience a headache, research. It could be due to a drop in blood glucose levels and caffeine withdrawal during fasting. Fasting can make you more susceptible to both of these things, which can contribute to feelings of dizziness or headaches. It’s also crucial to stay hydrated, as dehydration can worsen headaches. 

These heady feelings usually only happen in the first few days and are typically mild and manageable. However, if you’re prone to headaches and fast for more than 16 hours a day, you may be at a higher risk for fasting headaches.

Regulating caffeine intake and maintaining hydration and sleep patterns are essential to avoid frequent fasting headaches.

Digestive Issues

Studies show intermittent fasting has digestive troubles like bloating, constipation, diarrhoea, nausea, and dehydration. Don’t worry; it’s not uncommon. Your body is adaptable, but changes in your eating routine can throw your gut off balance. When you alter your eating schedule, your gut bugs need to adjust, which can cause tummy troubles. 

Once your body settles in and you are not eating anything new, intermittent fasting can help balance your gut bacteria and reduce inflammation, which may minimise stomach troubles. However, the improvement in gut health over time requires more research.

Irritability and Other Mood Changes

Intermittent fasting can sometimes affect your mood and make you irritable and moody. It is because when your blood sugar level drops, you may experience anxiety and have difficulty concentrating. However, the accomplishment and pride you get when you achieve your fasting goals can make the struggle worthwhile.

Some studies show that intermittent fasting can improve symptoms of anxiety and depression, but that’s not always the case for everyone. As a newbie to fasting, you may feel stressed and crankier initially. However, research shows that many people with obesity experience improvements in energy and mood.

Fatigue and Low Energy

Intermittent fasting may leave you feeling low on energy and fatigued, at least initially. Your blood sugar levels may drop when you skip meals. It makes you feel weak and disrupts your sleep. It’s like that afternoon slump you experience where you only want to close your eyes and nap.

For some people, the fatigue usually subsides once your body gets used to this new routine. In addition, intermittent fasting improves mental health and reduces physical and psychological fatigue in some cases. So, if you do not feel improvement in your mood over time, please consult a certified nutritionist.

Bad Breath

If you’re doing intermittent fasting, you might experience bad breath. It is a common symptom called halitosis. A study reveals that when you fast, your body uses fat for energy, producing acetone as a byproduct. This acetone can cause your breath to smell funky, like nail polish remover. Additionally, fasting can lead to dehydration, which can also cause bad breath. And since dehydration can decrease your saliva flow, your mouth can dry out, worsening the bad breath. So if you’re fasting, be aware that bad breath might be one of the side effects you’ll have to deal with.

Poor Sleep

If you’re trying out intermittent fasting, you may experience some trouble with your sleep. It could be because your new meal schedule interferes with your body’s internal clock. Some studies show that sleep disturbances are a common side effect initially, but they tend to decrease over time. However, other research suggests that intermittent fasting may improve sleep quality. 

More research is required to comprehend the relationship between intermittent fasting and sleep fully, but it’s possible that meal timing and size could be factors. Over time, though, intermittent fasting may help reinforce your internal body clock and lead to better sleep.

Dehydration

When you fast, your body loses water and salt through your urine, especially in the first few days. It can result in dehydration, which can cause dizziness, headaches, and fatigue. Drinking more water is essential if you experience these symptoms during a fast. Severe dehydration can even affect your ability to concentrate, remember things, and affect your mood. So, it’s vital to ensure you drink enough water during fasting. If you notice a significant colour change in urination, it is a sign that you need to increase your water intake. It is no secret that staying hydrated is vital for your overall health. But it is even more necessary when fasting.

Malnutrition

If you want to try intermittent fasting, ensure you don’t jump into it too quickly, or you could have a nutritional deficiency. Calorie intake is often the focus of fasting, but remember your body’s dietary requirements. Also, remember that fasting only affects when you eat, not what you eat. And prolonged fasting can lead to malnutrition, resulting in unintentional weight loss, fatigue, mood changes, and difficulty concentrating. 

Eating nutrient-dense foods like fruits, vegetables, nuts, seeds, legumes, grains, and fats to stay healthy. To stay on track, consult a dietician and create a nutritious meal plan you can follow during fasting. Avoid restricting calories excessively, as it can affect your body’s functioning. 

Summary

Intermittent fasting is a popular weight loss approach that involves fasting and eating windows. Although the benefits are numerous, it is essential to note that there are side effects to be aware of. Ten common side effects include unhealthy eating habits, hunger and cravings, headaches, digestive issues, irritability and mood changes, fatigue and low energy, bad breath, poor sleep, and dehydration. For some, these side effects may be mild and manageable; most people adjust after a few days. However, if symptoms persist or become severe, it is best to consult a medical professional.

Who Should Not Choose Intermittent Fasting?

Intermittent fasting is a widespread practice for improving health and losing weight, but it’s not suitable for everyone. 

Here’s who should avoid it:

• If you’re pregnant or breastfeeding, it’s best to avoid intermittent fasting. It could negatively affect your baby’s health and development.
• Elderly individuals who experience weakness, immunodeficient people, those with dementia, or a history of traumatic brain injury should also avoid intermittent fasting.
• Those with eating disorders like anorexia nervosa or bulimia nervosa should avoid intermittent fasting, as it could exacerbate their condition.
• For people with diabetes or on chronic medications, it’s crucial to discuss fasting with a healthcare provider beforehand, as it could adversely affect their condition.
• Finally, children and teenagers still growing and underweight should not participate in intermittent fasting as it could impede their physical development and overall health.

Remember, intermittent fasting may not be for everyone. Before starting a new dietary regimen, one must always consult a healthcare professional or certified nutritionist.

Summary

While intermittent fasting has gained popularity as a way to improve health and lose weight, it’s not suitable for everyone. Pregnant or breastfeeding women, elderly individuals, immunodeficient people, those with dementia or a history of traumatic brain injury, people with eating disorders, and children and teenagers should avoid intermittent fasting. Additionally, those with diabetes or on chronic medications should discuss fasting with a healthcare provider beforehand.

The Final Word

Intermittent fasting can have numerous health benefits, including weight loss, improved metabolism, and reduced inflammation. However, one must be aware of the potential side effects of this diet, and any other diet that requires extreme measures, to make a well-informed decision about whether it is the right approach for you. In addition, adopting sustainable measures promoting overall health and long-term weight management is crucial. Therefore, finding a balanced diet and exercise routine that works for your lifestyle is essential for achieving long-term weight loss goals.

Disclaimer: The purpose of this article is just to disperse knowledge and raise awareness. It does not intend to replace medical advice from professionals. For further information, please contact our certified nutritionists Here.

Frequently Asked Questions (FAQs)

Q. What are the common side effects of intermittent fasting? 

A. Intermittent fasting can cause hunger, cravings, headaches, digestive problems, irritability, mood swings, fatigue, and low energy. In addition, it also results in bad breath, inadequate sleep, dehydration, and malnutrition. However, these side effects may not affect everyone, but following a sustainable weight-loss measure is crucial to ensure healthy and long-term weight loss.

Q. Is it normal to feel hungry during intermittent fasting? 

A. Yes, intermittent fasting can sometimes make you hungry and crave food. During the start of fasting, your body might endure an adjustment period. It is where you feel hungrier than usual. However, the temporary hunger may not last for long for everyone. But, it is still better to choose sustainable measures.

Q. Can intermittent fasting cause headaches or migraines? 

A. Yes, during intermediate fasting, headache is common. It is because of a drop in blood glucose levels and caffeine withdrawal during fasting. Additionally, dehydration can also result in headaches. However, for some people, it lasts for only a few days of fasting. 

Q. Is it safe to do intermittent fasting if you have diabetes? 

A. However, it is considered that intermediate fasting helps regulate insulin levels and improve glucose uptake. People with diabetes should discuss this with healthcare providers before a fasting regime, which may result in adverse impacts.

Q. Can intermittent fasting lead to nutritional deficiencies? 

A. Yes, intermediate fasting could lead to nutritional deficiencies. Also, prolonged fasting can result in malnutrition, leading to unintentional weight loss, fatigue, and difficulty focusing. Therefore, ensure you should eat nutrient-dense foods during your non-fasting period.

Q. Does intermittent fasting cause muscle loss? 

A. Several studies reveal that intermittent fasting leads to the loss of lean muscle mass. However, if you eat an adequate or high-protein diet, you don’t need to be concerned about losing muscle with short-term intermittent fasting. But it is best to choose more sustainable and healthy measures for those who aim for long-term results.

Q. Can intermittent fasting affect my menstrual cycle? 

A. Yes, intermediate fasting can affect menstrual cycles in women. It is because women’s reproductive systems are sensitive to calorie restrictions. That means prolonged fasting can affect the oestrogen that is vital to the menstruation process. 

Q. Are there any negative impacts of intermittent fasting on sleep quality? 

A. Yes, intermediate fasting can trouble your sleep. It is due to your new dietary schedule, which interferes with your body clock. However, for some, it is a minor side effect of fasting, lasting only a few days. But for some, it may be a long term side effect. Hence, one should look for more sustainable and healthy ways.

Q. Can intermittent fasting lead to increased stress levels? 

A. Yes, intermediate fasting leads to increased stress levels. It is because intermediate fasting can increase cortisol levels, a stress hormone. Therefore, if you are doing intermediate fasting for a long time, it makes you stressed.

Q. Is it safe to exercise while doing intermittent fasting?

A. Yes, it is entirely safe to exercise while doing intermediate fasting. It reduces fat burning during exercise and improves sports performance by optimising muscle recovery. 

Research Sources

1. Patterson RE, Laughlin GA, LaCroix AZ, Hartman SJ, Natarajan L, Senger CM, Martínez ME, Villaseñor A, Sears DD, Marinac CR, Gallo LC. Intermittent Fasting and Human Metabolic Health. J Acad Nutr Diet. 2015 Aug;115(8):1203-12. doi: 10.1016/j.jand.2015.02.018. Epub 2015 Apr 6. PMID: 25857868; PMCID: PMC4516560.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4516560/

2. Aly SM. Role of intermittent fasting on improving health and reducing diseases. Int J Health Sci (Qassim). 2014 Jul;8(3):V-VI. DoI: 10.12816/0023985. PMID: 25505868; PMCID: PMC4257368.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4257368/

3. Sundfør TM, Svendsen M, Tonstad S. Effect of intermittent versus continuous energy restriction on weight loss, maintenance and cardiometabolic risk: A randomised 1-year trial. Nutr Metab Cardiovasc Dis. 2018 Jul;28(7):698-706. doi: 10.1016/j.numecd.2018.03.009. Epub 2018 Mar 29. PMID: 29778565.

https://pubmed.ncbi.nlm.nih.gov/29778565/

4. Torelli P, Manzoni GC. Fasting headache. Curr Pain Headache Rep. 2010 Aug;14(4):284-91. DoI: 10.1007/s11916-010-0119-5. PMID: 20490742.

https://pubmed.ncbi.nlm.nih.gov/20490742/

5. Wilhelmi de Toledo F, Grundler F, Bergouignan A, Drinda S, Michalsen A. Safety, health improvement and well-being during a 4 to 21-day fasting period in an observational study including 1422 subjects. PLoS One. 2019 Jan 2;14(1):e0209353. DoI: 10.1371/journal.pone.0209353. PMID: 30601864; PMCID: PMC6314618.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6314618/

6. Anic K, Schmidt MW, Furtado L, Weidenbach L, Battista MJ, Schmidt M, Schwab R, Brenner W, Ruckes C, Lotz J, Lackner KJ, Hasenburg A, Hasenburg A. Intermittent Fasting-Short- and Long-Term Quality of Life, Fatigue, and Safety in Healthy Volunteers: A Prospective, Clinical Trial. Nutrients. 2022 Oct 10;14(19):4216. doi: 10.3390/nu14194216. PMID: 36235868; PMCID: PMC9571750.

https://pubmed.ncbi.nlm.nih.gov/36235868/

7. Harvie M, Howell A. Potential Benefits and Harms of Intermittent Energy Restriction and Intermittent Fasting Amongst Obese, Overweight and Normal Weight Subjects-A Narrative Review of Human and Animal Evidence. Behav Sci (Basel). 2017 Jan 19;7(1):4. DoI: 10.3390/bs7010004. PMID: 28106818; PMCID: PMC5371748.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5371748/

8. Anderson JC. Measuring breath acetone for monitoring fat loss: Review. Obesity (Silver Spring). 2015 Dec;23(12):2327-34. DoI: 10.1002/oby.21242. Epub 2015 Nov 2. PMID: 26524104; PMCID: PMC4737348.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737348/

9. Almeneessier AS, BaHammam AS. How do diurnal intermittent fasting impact sleep, daytime sleepiness, and markers of the biological clock? Current insights. Nat Sci Sleep. 2018 Dec 7;10:439-452. doi: 10.2147/NSS.S165637. PMID: 30573998; PMCID: PMC6292409.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6292409/

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Fasting is an age-old tradition practised for centuries for soul purification & body cleansing. It is a well-known practice in various cultures & religions. However, the past decade has witnessed intermittent fasting as one of the most popular fitness & health trends globally. It has moved beyond rituals and has established itself to be effective in improving & maintaining a healthy lifestyle, promoting weight loss, and increasing longevity.

Intermittent fasting or energy restriction involves abstaining from eating either partially or entirely for a stipulated time before resuming a regular eating schedule. It can last anywhere between 12 to 40 hours. It would be best to refrain from consuming calorie-containing drinks or solid food during this period. Instead, you can opt for water, black coffee, or any other calorie-free beverage.

Here is the general concept with an example. For a 24-hour fasting regimen, if someone finishes the meal by 7 pm Monday, the next meal is instructed on Tuesday after 7 pm. The time frame chosen for intermittent fasting depends on the person, and it can last from lunch to lunch or breakfast to breakfast.

In its most conventional sense, intermittent fasting governs when you should eat. Hence, this form of calorie restriction becomes a part of an eating pattern. You can classify intermittent fasting into types depending on the calorie allowance and duration. The choice of which calorie-restricting diet yields the best result is decided by finding the most suitable diet according to your lifestyle.

Types of Intermittent Fasting

The five most prevalent eating patterns of intermittent fasting which you can add to the diet include:

1. The Leangains Protocol or Time-restricted Eating

This fasting regimen involves restricting the daily eating periods to 8 hours or longer. One of the most popular examples of such a type of intermittent fasting is the 16/8 method. This fasting pattern features a window of 8 hours of eating, followed by 16 hours of fasting. During the 8-hour eating period, one is allowed to fit in 2 or more meals as per choice.

The proponents of the 16/8 method often claim it to be the most sustainable, convenient, and easy way to burn calories, shed extra kilos, and significantly improve health. Moreover, it also assists in combating high blood pressure and efficiently controlling blood sugar levels. You can repeat this fasting cycle as per your preference. It can range from once or twice every week or even every day.

The 16/8 regimen is more accessible to follow than other intermittent fasting routines. Moreover, it provides comparatively better results with nominal disruption to your lifestyle. The growing popularity of 16/8 fasting is due to its flexibility, fewer restrictive protocols, and ease of adoption into varying lifestyles. However, a few factors are essential to negate this method’s potential health risks. These include choosing a whole-food balanced diet and avoiding packaged food, sugary drinks, deep-fried items, & other ultra-processed foods. 

Several studies have also associated drawbacks of this fasting technique which include:

• Possibility of potential weight gain due to overeating
• Incidence of physical symptoms
• Hormonal alterations and effect on reproductive health

Studies have found that intermittent fasting may cause hormonal variations. Among females, this can impact menstrual cycles and, at times, fertility.

2. The 5:2 Diet

Also known as the Fast Diet, it ranks among one of the most preferred intermittent fasting regimens. Michael Mosley, a British journalist, initially popularised this diet form.

In this method, you need to follow five days of normal eating with two days of the restricted calorie intake of up to 500-600/day. A quarter of the standard calorie requirement is prescribed during these two days. The choice of the two days of limited diet in a particular week is as per the candidate’s preference, with at least a day of non-fasting. However, it is essential to note that, on days of non-fasting, the eating routine should be “normal” instead of consuming anything, especially junk or unhealthy food.

The 5:2 diet regimen showed benefits in line with other calorie restricting techniques. Moreover, studies conducted on the 5:2 diet and very similar alternate-day fasting routines like the 4:3 diet demonstrated several benefits, including:

• Improvement in blood lipid levels
• Studies have shown that this diet regimen effectively improves insulin sensitivity and ensures efficient control of insulin levels.
• Reduction in fat mass with no alteration in muscle mass
• Reduction of blood triglyceride levels by approximately 20%
• Better effectiveness on inflammation by reducing C-reactive protein (CRP) levels
• About 40% reduction in leptin levels, a hormone secreted by fat cells that assist in regulating body weight.

3. Eat Stop Eat

The Eat Stop Eat intermittent fasting module has been gaining popularity recently. This fasting routine involves fasting for an entire day (24 hours) twice a week. Brad Pilon spoke about this method in his famous book ‘Eat Stop Eat.’ This form of intermittent fasting focuses more on the correlation between health and meal frequency & timing.

You need to fast for two days and then have a regular diet for the rest of the five days. However, a sensible decision of food choices and appropriate quantity consumption is ideal for the five days. In addition, you need to maintain optimum hydration levels while fasting. Also, you can consume calorie-free tea or coffee.

This practice also encourages weight loss through calorie deficit and metabolic shift processes. However, preliminary research also suggests that, during prolonged fasting, the process of metabolic shift may promote additional fat utilisation than conventional dieting strategies.

The fasting protocol implemented in the module is safe for most healthy adults. However, before adopting it, potential downsides should be considered, which include:

• Insufficient intake of nutrients
• Hormonal alterations
• Sense of deprivation due to eating restrictions

4. Alternate Day Fasting 

Another way of intermittent fasting is alternate-day fasting. In this, an individual fasts every other day and consumes anything the day after. All calorie-free beverages like water, tea, and unsweetened coffee are permitted. You can also consume 20-25% of the minimum energy requirement or roughly 500 calories. Studies have found that this modified approach is more sustainable and effective than conventional alternate-day fasting.

The benefits shown are similar to other forms, which include:

• Reduction of risks associated with type 2 diabetes
• Lowering risks of heart disease among obese individuals
• Decrease in LDL cholesterol levels
• Lowering of blood triglyceride level
• Impact on autophagy, a process associated with degradation & recycling of old cells. This process plays a vital role in preventing neurodegeneration, cancer, heart disease, and other conditions.

Fasting promotes autophagy which plays a significant role in maintaining a healthy and long life. Although this fasting method looks promising, additional research on establishing a correlation between longevity is required further.

5. The Warrior Diet

This form of intermittent fasting involves short bursts of overeating, followed by a long duration of undereating. This method may lead to effective weight loss. However, it is often inappropriate as it leads to disordered eating. The genesis of this diet is from the eating patterns of ancient warriors, who feasted during the night after minimal food during the day.

Former Israeli Special Forces Ori Hofmekler first designed the warrior diet. Practitioners follow a 20-hour fasting period and consume healthy food during the leftover four-hour window.

The warrior diet yields similar benefits compared to other forms of intermittent fasting. However, it is more extreme than others. There is an absence of relevant research studies on this making it tough to follow perfectly.

Intermittent Fasting – Salient Points

Promising health outcomes and improving lifestyle are a few of the tempting promises made when you follow intermittent fasting. In addition, it is simple to implement. Fasting claims benefits by simply changing mealtimes. However, several dietitians ask you to exercise caution. A careful approach to intermittent fasting provides many potential benefits. Below are 10 points to keep in mind when starting with intermittent fasting.

1. Choosing the appropriate regimen according to one’s lifestyle

A few of the most popular modules include The Leangains Protocol, the 5/2 approach, and Eat Stop Eat module, and others.

The Leangains Protocol is one of the most widely followed fasting schedules worldwide. This fasting form is subdivided into several other types depending on the duration of fasting & non-fasting periods. However, the 16/8 method is considered one of the most popular regimens among all other calorie-restricting diets.

2. Controlling late-night eating episodes may prove to be highly beneficial

Eating right before bed causes indigestion, acid reflux, and circadian disruption, leading to discomfort & fatigue. Fasting in the morning followed by eating right before bedtime disrupts the circadian cycle. It promotes the occurrence of several ailments and also increases their severity. Conditions that can arise from eating a late meal at night include Type 2 Diabetes and various cardiovascular diseases. Moreover, eating late also messes with the body’s biological clock and may result in anxiety & depression.

3. Maintaining a controlled eating approach during non-fasting periods

Being mindful of food choices during non-fasting hours is extremely important for obtaining desired results from intermittent fasting. The quality of the meal is something you need to monitor.

Intermittent fasting should go hand in hand with a balanced diet. Nutritionists & dieticians recommend whole grains, lean protein, fibre-containing foods, and vegetables. In addition, you should include fruits with a low-glycemic index that do not spike up blood glucose levels. A stable blood sugar level is necessary as it helps avoid unnecessary cravings.

4. Maintaining a window of a minimum of 12-hours between meals

Depending on the size of the last consumed meal, 8 hours are required for the meal to be digested, absorbed & assimilated. However, in most cases, 8-hours is not enough for the body to complete these processes. Hence, professionals recommend at least a 12-hour window between meals for this detoxification process to sustain the system’s cleanliness.

5. Being aware of boundaries and restrictions

Individuals need to realise & be aware of the boundaries of intermittent fasting. Therefore, many should avoid such prolonged periods of fasting. For example, young adults, breastfeeding or pregnant women need to avoid fasting regimens as they have strict nutrient requirements.

Diabetic patients need to refrain from such fasting methods. They require regular insulin administration and are instructed on a strict diet of regular small meals at even intervals to avoid feeling dizzy or fatigued. Intermittent fasting among women can cause hormonal imbalance, affecting mood, fertility, and menstruation. Therefore, consulting professionals is advisable before such regimens.

6. Drink Plenty of Water

Drinking plenty of water: The body gets confused between feeling thirsty and hungry. Hence, the body needs ample hydration during intermittent fasting. 

7. Add Healthy Fat

Please add two to three spoonfuls of healthy fats to the last meal to keep blood sugar levels steady during the fasting window. 

8. Devising an appropriate workout routine

Exercising during a fasting diet is recommended by keeping certain factors in mind. Right exercises and the timing are some of them. For instance, exercising during a fasting state and early in the morning is advised by experts. A well-designed routine & workout schedule is also highly endorsed. People must be aware of the required exercises.

9. Listening to your body

It is necessary to listen to one’s body. Being mindful determines an individual’s health. For instance, symptoms like weakness or fatigue, irritation, anxiety, dizziness, and lack of concentration are usual at the outset of intermittent fasting. They indicate that the body is undernourished and starved. Hence keep a watch out and decide on modifying the fasting schedule accordingly.

It is natural for the body to react to the changes of fasting. Hence, experts recommend monitoring them and giving the diet schedule roughly a week to adjust to normalcy. However, suppose such symptoms persist for longer. Then, it is highly advisable to discontinue the diet and opt for other means to lose weight.

10. Maintaining the status of the journey

In intermittent fasting, a food journal plays an effective role in gauging progress, for instance, keeping track of the food consumed, symptoms, and emotions.

A few other pointers include playing around with different methods and breaking the fasting period steadily, regularly & uniformly. Also, it would help if you ate when the need arises. Finally, be gentle while commencing an eating plan and be aware of the difference between wanting to eat & needing to eat.

Benefits of Intermittent Fasting

The benefits of intermittent fasting are not limited to just weight loss. Several promising findings suggest that such time-restricted diets may offer several additional benefits.

1. Weight Loss and Control on Obesity

When the body gets used to alternate fasting & non-fasting periods, it consumes less, resulting in fewer calorie intake. Therefore, it is a primary factor for weight loss within intermittent fasting norms.

Moreover, it also facilitates weight loss by enhancing hormonal functions and promoting metabolic rates. Increments in metabolism positively control several hormone-induced insulin changes, norepinephrine, and HGH cholesterol. High metabolism rates burn additional calories and encourage weight loss.

A  study on intermittent fasting demonstrated that it led to a highly appreciable 3-8% weight loss within 6-24 weeks. In addition, this research revealed loss of visceral fat where participants lose 4-7% of waist fat. Moreover, another study also highlighted that intermittent fasting results in lower loss of muscle mass than continuous calorie restricting diets.

2. Combating Type 2 Diabetes

According to the International Diabetes Federation (IDF), in 2021, globally, type 2 diabetes between 20 & 79 years stood at roughly 537 million. This number will reach 643 million and 783 million by 2030 and 2045. Also, the healthcare expenditure on diabetes was a staggering US$ 966 billion in 2021.

High blood sugar levels in diabetes result from increased insulin resistance. Therefore, any physical activity, fasting regimens, or food habits that reduce insulin resistance, assists in combating diabetes better. In addition, research says that intermittent fasting is highly beneficial to promote insulin resistance encouraging efficient reduction in blood sugar levels. For example, the prediabetes study demonstrated that intermittent fasting led to a 3-6% reduction in fasting blood sugar over 8-12 weeks.

3. Management of Heart Health

Hypertension is a common ailment affecting worldwide. According to a study in 2014, the prevalence of hypertension in rural & urban households in India stood at roughly 25% and 33%, respectively. In 2010, the problem ranked 3rd in entire South Asia. It is highly worrying as it indicates an abnormally high prevalence of cardiovascular diseases (CVD) and healthcare expenditure costs among Asian countries.

Animal studies on the effectiveness of intermittent fasting diets have demonstrated that it offers noticeable results in lowering blood pressure. A yearlong follow-up intermittent fasting study conducted by Buchinger Wilhelmi clinic in Germany on 1422 people showed outcomes similar to animal studies. Additional research on intermittent fasting suggests that it plays a pivotal role in lowering cholesterol and improving overall heart health.

Intermittent fasting significantly improves other risk factors associated with heart health, such as blood triglycerides, inflammatory markers, and LDL cholesterol levels. However, the majority of research was on animals. Therefore, the effects of intermittent fasting on humans need to be studied further before any recommendations.

4. Promoting Longevity

The ability of the intermittent fasting methods to positively contribute to a long life is perhaps one of its most exciting & researched outcomes. Furthermore, the impact of such a fasting regimen on health markers and metabolism suggests that it can play a substantial role in the same arena.

Studies on rodents found that both calorie-restricting diets led to long life. A 2017 study on mice concluded similar findings. During the experiment, they fasted alternatively. The results showed a whopping 13% increase in lifespan. Nonetheless, research studies on the effect of intermittent fasting on human lives’ longevity are pointedly understudied.

5. Increase in Cell Turnover

Intermittent fasting helps in the body’s detoxification by inducing autophagy. Autophagy is a lysosome-dependent regulated mechanism that removes damaged organelles, abnormal proteins, and other dysfunctional components. When the body goes through an intermittent fasting schedule, it initiates a process of healing and cleansing.

According to research on 11 participants, time-restricted feeding between 8 am to 2 pm only led to the expression of protein MTOR and autophagy gene LC3A. However, another study on mice verified that restriction of food intake led to a significant increase in neuronal autophagy specifically.  

6. Reduced Inflammation and Protection Against Cancer

Several animal studies have demonstrated that calorie-restricting diets inclusive of intermittent fasting routines can lower inflammation levels. For example, a survey of 50 participants fasting for Ramadan involved eating at night and fasting between sunrise and sunset. They showed lower blood pressure, body fat, and pro-inflammatory markers during fasting hours.

Moreover, studies have also demonstrated that fasting every alternate day decreases the chances of lymphoma development, thereby reducing the risk of cancer.

The Final Word

Research studies demonstrate intermittent fasting is quite advantageous compared to many kinds of calorie-restricting diets. Additional benefits include protection against CVDs, amplification of brain functions, and better sleep patterns. It is vital to remember that intermittent fasting may have several potential side effects, but they vary within individuals. It can lead to insomnia, hunger, headaches, fatigue, and nausea. These possible side effects are temporary and generally settle down within a month. In addition, intermittent fasting assists in weight management. Finally, it helps address several chronic ailments like high cholesterol, irritable bowel syndrome (IBS), and arthritis.

However, intermittent fasting and other calorie-restricting diets are not suited for everyone. Experts always recommend consulting a primary care practitioner beforehand. A few groups of people who must avoid these fasting routines strictly include:

• Teens & children under the age of 18
• Breastfeeding or pregnant women
• Individuals suffering from abnormal blood sugar levels or diabetes
• People with a history of eating disorders

Frequently Asked Questions (FAQs)

Q. How much weight can you lose in a month with intermittent fasting?

Intermittent fasting can lead to up to 2 to 6 kilos of weight loss in a single month if done in adherence to all protocols and mindfully. However, consider age, sex, stress level, and physical activity before choosing from the different intermittent fasting methods.

Q. How soon will I see results from intermittent fasting?

It takes approximately ten days to notice a difference in body structure. However, it may take roughly 2 to 10 weeks to lose significant weight. Generally, a week is usually required to lose a pound.

Q. Do I have to do intermittent fasting every day? 

Since intermittent fasting can come in different forms, it would be wrong to conclude that all the methods are for daily practice. You can follow a few techniques every day but under the supervision of an expert. However, intermittent fasting, like The Warrior Diet, is not for every day.

The Leangains Protocol, especially the 16/8 method, is often considered the most sustainable, convenient, and easy way to burn calories, shed extra kilos, and improve health. This regimen features an 8-hour feeding window, followed by 16-hours of fasting. Compared to other intermittent fasting routines, the 16/8 regimen is easy and maintains a normal lifestyle. You can repeat this fasting and the non-fasting cycle as per your comfort. You can adjust the frequency from once or twice a week to every day. However, expert advice is of utmost importance before adopting the regimen.

Q. Can fasting bring on your period? 

The impact of fasting and other diets on menstruation and overall reproductive health is minimal. Hence, whether fasting affects the menstruation cycle or not isn’t conclusive. However,  studies say that diet restriction may impact the female reproductive organ. For example, the long duration of fasting affects the brain’s hypothalamus, which is responsible for regulating hormones like oestrogen, which in turn regulates menstruation. Similarly, studies have also confirmed that calorie restriction lowers the level of progesterone, which again reduces the chances of ovulation.

Q. Is 12 hours enough for intermittent fasting? 

Researchers have found that subjecting the body to 10 to 16 hours of fasting transforms fat into energy. It releases ketones into the bloodstream and encourages weight loss. The 12-hour fasting period is suitable for beginners as it gives the body time to adjust to the new routine with ease. Once the body gets adapted to this, weight loss follows naturally.

Q. Does sleeping count as fasting? 

Yes, while following intermittent fasting, sleeping is considered a fasting period. Therefore, one does not consume food or drinks during this state. 

Q. What are the basic rules of intermittent fasting?

Intermittent fasting is a form of eating pattern where periods of eating and fasting are alternate according to a well-designed procedure. This fasting is to avoid any form of food or beverages containing calories strictly. One should eat a balanced, wholesome diet during the eating period and avoid unhealthy food. The most appropriate intermittent fasting method should be chosen and exactly followed. Few other basic rules of this form of fasting include:

• Staying hydrated
• Avoiding sweeteners
• Avoiding late-night eating
• Keeping a tab on day-to-day activities

Q. What is a good intermittent fasting time for beginners?

It is necessary to be gentle with oneself. Therefore, maintaining a window of a minimum of 12-hours between meals is highly beneficial. Furthermore, since the duration of the fasting window is small, it is easier for beginners to adjust to such a routine with minimal difficulty. Moreover, including the sleeping period within these 12-hours is effective. Finally, maintaining at least a 12-hour window between meals ensures proper digestion, absorption, and assimilation. Therefore, professionals highly recommend this as it helps detoxify the body. 

Q. Can I eat fruits during intermittent fasting?

Consumption of highly nutritious foods during the eating phase of intermittent fasting is highly encouraged. Since fruits contain high minerals, vitamins, fibres, and phytonutrients, these components play a crucial role in controlling cholesterol & blood glucose levels and maintaining a healthy bowel. However, it is also recommended to avail of fruits with a low-glycemic index, as these do not lead to a rapid increase in blood glucose level. 

Q. Will a banana break a fast? 

According to experts, bananas as a single food product are not recommended as a medium to break a fast. Also, bananas are more popular for their iron & sugar content rather than proteins or fats. Hence, combining bananas with other high-quality sources of proteins, fibres, and fat can break an intermittent fast. However, the consumption of bananas is encouraged before beginning the fasting phase since it digests significantly slower and provides a source of lasting energy.

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Over recent years, fasting has drastically risen in popularity primarily because of endorsement from celebrities and experts. The fact remains though; there are still risks related to fasting if done incorrectly – particularly, dehydration, which is why Muslims are advised by scientists and charities alike to drink lots of water before fasting periods in Ramadan. Many devout Muslims have wondered: what are the health benefits of fasting during Ramadan?

So, does fasting have a positive impact on your health? Hopefully, through this short guide, we will be able to explore this question and highlight some of the benefits that come with effective fasting regimes and systems.

The Health Benefits of Fasting During Ramadan 

This article discusses three of the most signifcant health benefits of fasting during Ramadan.

1. Inflammation and Disease

It is widely theorised and agreed upon that inflammation is an accurate indicator of disease, but it’s also been theorised that inflammation could be a cause of disease too. This means that ensuring your body is safe and experiences low levels of inflammation is a brilliant way of avoiding sickness and disease, which fasting can help with a lot.

Research shows that intermittent fasting and the calorie restrictions that come with it are effective at reducing the effects of pro-inflammatory cells in the body. This research was done explicitly during Ramadan, meaning that the participants had a very high likelihood of being strict with their dieting patterns, adding validity to the conclusions of the research.

By fasting intermittently, the participants were naturally reducing their body’s inflammation, decreasing the risk of multiple diseases. This is incredibly valuable to help you stay healthy.

2. Diabetes

Diabetes is one of the most widespread and challenging diseases in the world, as well as costing medical professional and citizens lots of money each year. With this in mind, it makes more sense to focus on prevention rather than cure, and as this research demonstrates, fasting can play a big part in that.

In particular, this investigation found that fasting was effective at preventing diabetes in ‘at-risk’ individuals, meaning that for those who aren’t at risk, it could be even more effective. The reason why fasting helps to prevent diabetes is that it assists in preventing insulin resistance, which is when the pancreas cannot produce adequate levels of insulin for the body and becomes overwhelmed. This inability to me the needed level of insulin leads to a rise in blood sugar levels, along with an increased risk of diabetes.

The study suggests that fasting encourages the body to consume ‘bad’ cholesterol and fats to sustain itself. These same ‘bad’ fats are fundamental in causing insulin resistance in the first place and so with their removal, the risk of diabetes decreases. Using this information as a basis, it becomes clear that fasting could play a huge role in preventing diabetes.

3. Weight and Health

One of the most commonly cited and undeniably true advantages of fasting during the Ramadan are its benefits to weight loss and health. By limiting calorie intake, fasting encourages the body to consume fats that you already have, making you lose weight which undoubtedly has a positive effect on both your physical and mental health.

This impact has the power to vastly impact our society, especially considering the increasing obesity problem across the globe.

Taking one demographic alone, Ramadan is practised by almost all of the 1.8 billion Muslims around the world (according to 2015 figures). This means that approximately a quarter of the planet’s population will have a month where they reduce their risk of disease, along with their weight and other disease indicators.

This alone would have a significant impact on health systems around the world, meaning that it could be even more impactful if more individuals chose to fast intermittently, whether as part of a religious celebration or not.

This is just the tip of the iceberg. There are plenty more health benefits of fasting during Ramadan and much more research to support claims of fasting being an adequate answer to many of the world’s health concerns. Without a doubt, fasting can make your life easier and healthier.

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People fast for various reasons. Some people fast for religious reasons, for example the Ramadan, while some fast for weight loss. A lot wonder if fasting is a dangerous activity, and the answer is no.

Once you can keep to the following tips, you would breeze through the fasting without breaking a sweat. Whatever your reason may be, the following are things you should do while fasting:

10 Healthy Things To Do While Fasting

Healthy Things to do While Fasting

1. Ensure you keep a short fasting period

It isn’t advisable to go on a dry fasting for days, as this is perilous. It can also cause some serious problems for your immune system. Doctors and researchers have confirmed that fasting periods shouldn’t extend beyond an 8-24 hours time period. 

Once it goes beyond this, the person stands the risk of facing problems that have been associated with fasting. The likely symptoms include irritation, dehydration, fainting, extreme hunger amongst schools. Considering that people react to things differently, there would be various reactions to it. 

2. Avoid over eating when you break your fast

Once fasting is over, some people tend to overeat. They believe this is to store up food in their system for later while they’re fasting. However, doing this would only make you tired through the day and would increase your chances of getting bloated. 

If weight loss is one of the main reasons behind your fasting, then you should be conscious of this. Regardless of how hungry you might think you feel, it is only advisable that you continue with eating your normal rations. 

3. Sleep

With the fact that there are different reactions to fasting, some people tend to feel exhausted while fasting. If you also face this, you shouldn’t avoid it. What you can do is to simply take a nap of at least 15 minutes. You can sleep for longer hours if you feel tired.

Taking a nap would help to get your system in order so you don’t end up dozing off while busy with work. 

4. Stay hydrated

You should drink more water within the short period of your fasting. If you avoid taking water for a long period, it might increase the chances of you having some side effects. These side effects include fainting, dehydration and dizziness. 

Increasing your water intake helps you stay energized through your fasting period. There are other ways to stay more hydrated.

5. Avoid carrying out rigorous exercises

While fasting, it isn’t good to exert too much force on the body by exercising. This doesn’t strengthen the body’s ability but, sometimes, makes it weaker. Though you can carry out exercises like walking, house chores, meditation and even yoga. 

Doing these would give you the chance to relax your body. However, if your reason for exercising is because you feel stressed while fasting, you should get some rest. 

6. Eat healthy

It is ideal that the food you eat before, after and during your fasting is a balanced diet. In situations where you don’t eat healthy meals before your fasting, you feel sluggish throughout the day. This can impact you negatively. 

Eating healthy within the three time periods helps to improve the state of your health. Also, it prevents you from feeling sick during your fast.

7. Avoid the hot sun

Health experts advise that people who are fasting should not go out and spend long hours unnecessarily under the sun during daytime. This will help prevent heat exhaustion. If it is necessary to go out, you should cover your head with a hat or cloth and try to avoid exposure to sunlight as much as possible.

8. Stop fasting if you feel sick

This is one of the healthy things to do while fasting. It is normal to feel tired, hungry, and irritable while you fast, but you should not feel sick. Some symptoms that indicate you need to stop fasting include dizziness, loss of consciousness, nausea and vomiting, diarrhea, burning sensation in the stomach, and chest pain or stomach pain.

9. Take supplements

When you fast, you miss out on essential nutrients, which makes it harder for your body to get its nutritional needs. Thus, those who fast should consider taking dietary supplements and multivitamins that will nourish the body with nutrients.

10. Keep yourself busy with wholesome activities

It can be excruciating to fast, especially if you are feeling bored and hungry. However, you avoid can unintentionally breaking your fast by engaging in wholesome activities while fasting. For example, you can read a book, take a walk, meditate, spend time with nature, write, or listen to a podcast. There are so many other healthy things to do when bored.

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These are the patients a registered dietitian would never recommend intermittent fasting to.

Intermittent fasting (IF) has been a weight-loss method many individuals have turned to. It involves an alternating eating and fasting pattern with a goal of weight loss, better metabolic wellness, and reduced inflammation. Some common patterns include fasting for 16 hours and restricting food intake to an eight-hour window. Others assume their regular eating pattern for five days straight, then limit their calorie intake to between roughly 500 and 600 for two consecutive days.

While positive results can be achieved from IF, there are also risks. If you are pregnant or have certain chronic conditions, intermittent fasting is not a viable choice for you. To learn more about this weight-loss method, we spoke with Ana Reisdorf, MS, RD, Registered Dietitian and Founder at GLP-1 Hub, who shares why she tells certain clients to avoid IF altogether.

For those in their 40s, 50s, and beyond, IF can make it challenging to meet daily protein needs, which can lead to increased muscle loss. This is concerning, as muscle mass already naturally decreases with age. In addition, it can decrease metabolic rate and increase cortisol (the stress hormone) over time.

Who Shouldn’t Intermittent Fast

While IF can be a successful method for some—and there’s a ton of supporting research behind its benefits—it’s not the right path for everyone.

“In those with hormonal changes (menopause/perimenopause), high stress, or on GLP-1s, fasting can cause calorie/protein intake to drop too low, increasing fatigue, muscle loss, or hormonal dysregulation,” says Reisdorf.

Who’s More Likely To Experience Negative Effects

According to Reisdorf, women in menopause and perimenopause, those who have diabetes (especially type-1), those with greater nutritional requirements (i.e. athletes), and individuals taking GLP-1 medication are most likely to experience negative side effects of IF.6254a4d1642c605c54bf1cab17d50f1e

“These groups have higher protein needs, hormonal imbalances, and can’t really afford to underfuel,” Reisdorf explains.

How Common It Is To Experience Setbacks With IF

Experiencing setbacks with IF is quite common, particularly in women who aren’t already consuming sufficient calories or those under significant stress.

“Many don’t realize they’re not eating enough because of IF until they feel exhausted, their hair starts falling out, they lose muscle, or weight loss completely stalls,” Reisdorf points out.

Mental and Behavioral Challenges You May Face When Fasting

IF typically increases obsessive thoughts about food, rebound overeating, and “black and white thinking” around eating habits.

“For some, IF makes an all-or-nothing mindset worse,” Reisdorf says.

​​If you’re curious about what else GLP-1s can do, check out 5 Surprising Health Benefits of GLP-1 Drugs That Have Nothing to Do With Weight Loss.

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