Blog Diets Fasting Can Intermittent Fasting Cause Weight Gain?

Can Intermittent Fasting Cause Weight Gain?

Imagine that you’ve jumped on the Intermittent Fasting (IF) bandwagon, convinced it’s your ticket to quick and steady weight loss — only to notice the weighing scale is creeping upwards. It can be an alarming discovery that leads to a lot of confusion and doubt. Can intermittent fasting cause weight gain? Or is there more to the story?

IF itself does not cause weight gain. Rather, it is how you approach and implement IF that will have a direct impact on your weight-loss journey. So before you toss out your fasting schedule, let’s unravel the mystery together. 

In this post, we’re going on a deep dive into the world of intermittent fasting and weight loss, armed with scientific research and expert analysis to separate fact from fiction. 

How Does Intermittent Fasting Relate To Weight Loss?

Intermittent fasting (IF) is an eating pattern that cycles between periods of fasting and eating (7). It doesn’t focus on specific foods, but rather on when you should eat them. The primary goal of IF is to create a calorie deficit, which can lead to weight loss. 

Here’s how intermittent fasting works for weight loss, with a science-based approach:

1. Hormonal Changes

When you fast, several hormonal changes are thought to occur in your body that may facilitate weight loss (3). Insulin levels drop, which promotes fat burning, while growth hormone and norepinephrine levels increase, further enhancing the breakdown of stored fat for energy.

2. Reduced Calorie Intake

By restricting your eating window, intermittent fasting may naturally lead to a reduction in your daily calorie intake. Consuming fewer calories than you burn is crucial for weight loss (12).

3. Increased Metabolic Rate

Short-term fasting has been shown to temporarily increase your metabolic rate, helping you burn more calories. This effect is attributed to an increase in norepinephrine, which boosts your metabolism during fasting periods (8).

4. Enhanced Fat Oxidation

Intermittent fasting promotes the use of stored fat as an energy source. When glycogen stores (your body’s primary energy source from carbohydrates) are depleted during fasting, your body switches to burning fat for fuel, possibly leading to weight loss (6).

See also
The Simplest Intermittent Fasting Guide of 2023

Read More: 9 Intermittent Fast Belly Fat Burner Hacks That Are Science-Backed

5. Improved Insulin Sensitivity

Fasting might improve insulin sensitivity, making it easier for your body to process glucose. Better insulin sensitivity can help reduce the risk of type 2 diabetes (4).

6. Cellular Repair And Autophagy

During fasting, your body is believed to initiate cellular repair processes, including autophagy. Autophagy is the removal of damaged cells and cellular components, which can contribute to overall health (1).

7. Reduced Inflammation

Intermittent fasting has been shown to reduce inflammation in the body (6). Lower inflammation levels may support weight loss by improving metabolic function and reducing the risk of weight-related health issues.

Can Intermittent Fasting Cause Weight Gain

Can You Gain Weight While Intermittent Fasting?

Yes, it is possible to gain weight while practicing intermittent fasting. While it can be an effective tool for weight loss, it’s not a one-size-fits-all solution. 

The optimal fasting method, duration, and eating window will vary from person to person. Additionally, maintaining a healthy diet and engaging in regular physical activities are vital for sustainable weight loss and overall health.

Below are some mistakes you may be making that can cause you to gain weight while on intermittent fasting and some solutions you can try to aid them:

1. Overeating During Eating Windows

Overeating during your eating window can be problematic because it can offset the calorie deficit created during the fasting period. This interferes with intermittent fasting’s ability to trigger weight loss, as consuming more calories than you burn will lead to weight gain.


  1. Plan your meals ahead of time to avoid compulsive eating.
  2. Prioritize nutrient-dense, whole foods to keep you feeling full and satisfied.
  3. Practice mindful eating and avoid distractions while eating.
  4. Control portion sizes and listen to your body’s hunger cues.

2. Not Engaging In Regular Physical Activity

Lack of physical activity can contribute to weight gain, even if you are practicing intermittent fasting. Exercise is essential for burning calories, maintaining muscle mass, and boosting metabolism, all of which are crucial for weight loss (12).

See also
Alternate Day Fasting: Schedule, Benefits, Risks, And More


  1. Incorporate a mix of cardio and strength training exercises into your routine.
  2. Aim for at least 150 minutes of moderate-intensity aerobic activity per week.
  3. Schedule exercise during your eating window to optimize energy levels.
  4. Find activities you enjoy to make exercise a sustainable habit.

Can Intermittent Fasting Cause Weight Gain

3. Consuming Nutrient-Poor, Calorie-Dense Foods

Focusing on meal timing without considering the quality of food consumed can lead to poor nutrition and weight gain. Nutrient-poor, calorie-dense foods can interfere with weight loss by causing you to consume more calories than necessary during your eating window (11).


  1. Fill your plate with whole, minimally processed foods like fruits, vegetables, lean proteins, and whole grains.
  2. Limit ultra processed and sugary foods, which are often high in calories and low in nutrients.
  3. Monitor your macronutrient balance to ensure you’re consuming adequate protein, healthy fats, and complex carbohydrates.
  4. Stay hydrated by drinking water and avoiding sugary beverages.

4. Not Getting Enough Sleep

Sleep deprivation can lead to weight gain because it disrupts the hormones that regulate your appetite and metabolism (9). Insufficient sleep can cause an increase in hunger and cravings while reducing your body’s ability to burn calories effectively.


  1. Aim for 7-9 hours of sleep per night.
  2. Establish a consistent bedtime routine and sleep schedule.
  3. Create a sleep-friendly environment by keeping your bedroom cool, dark, and quiet.
  4. Limit exposure to screens and stimulants like caffeine and nicotine when close to bedtime.

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5. Fasting For Too Long Or Too Often

Overdoing fasting can lead to muscle loss, metabolic slowdown, and nutrient deficiencies, which can ultimately result in weight gain. It’s essential to find a fasting schedule that works for your body and lifestyle without causing negative side effects.


  1. Experiment with different fasting methods and durations to find out what works best for you.
  2. Listen to your body and adjust your fasting schedule as needed.
  3. Consult with a healthcare professional or registered dietitian for personalized guidance.

6. Not Managing Stress Effectively

Uncontrolled stress can negatively impact your weight loss efforts by triggering emotional eating and causing hormonal imbalances that promote weight gain (10). Learning to manage stress is crucial for maintaining a healthy weight during intermittent fasting.

See also
The Stages Of Intermittent Fasting, Explained


  1. Practice relaxation techniques like deep breathing, meditation, or yoga.
  2. Engage in hobbies and activities that bring you joy and relaxation.
  3. Build a strong support system and communicate your feelings with friends, family, or a therapist.
  4. Prioritize self-care and set realistic expectations for yourself.

Can Intermittent Fasting Cause Weight Gain

7. Skipping Meals During Your Eating Window

Skipping meals during your eating window can lead to extreme hunger, causing you to overeat later and potentially gain weight. Consuming regular, balanced meals during your eating window is essential for maintaining a calorie deficit and promoting weight loss.


  1. Plan your meals and snacks within your eating window.
  2. Focus on nutrient-dense foods that keep you feeling full and satisfied.
  3. Avoid skipping meals, even if you’re not feeling hungry, to prevent overeating later.

8. Not Tracking Your Progress

Failing to monitor your progress can make it challenging to identify potential issues and adjust your strategy accordingly. Keeping track of your weight, measurements, and other relevant metrics can help you stay on track and fine-tune your intermittent fasting approach.


  1. Weigh yourself regularly, but avoid daily weigh-ins to prevent fluctuations from discouraging you.
  2. Take body measurements and progress photos to track changes in body composition.
  3. Use a food diary or app to monitor your calorie intake and ensure you’re maintaining a calorie deficit.

9. Dependency On Caffeine

Overconsumption of caffeine can have negative effects on your body, including impacting insulin sensitivity. While moderate caffeine intake may offer some benefits, excessive consumption can cause blood sugar fluctuations and interfere with intermittent fasting’s potential ability to improve insulin sensitivity (5).


  1. Limit your daily caffeine intake to 400 mg or less (approximately 4 cups of brewed coffee).
  2. Opt for caffeine-free alternatives like herbal tea or water infused with fruits.
  3. Gradually reduce your caffeine intake if you’re currently consuming excessive amounts, to avoid withdrawal symptoms.

Read More: Can You Drink Tea While Fasting? Yes, You Can But Read This First!

See also
Water Fasting For A Week: Benefits And Dangers

10. Setting Unrealistic Expectations

Expecting rapid weight loss or dramatic results can set you up for disappointment and frustration, which may lead to weight gain if you give up on intermittent fasting altogether. It’s crucial to set realistic goals and be patient with the process.


  1. Focus on gradual, sustainable weight loss (1-2 pounds per week).
  2. Celebrate small victories and non-scale achievements.
  3. Understand that weight loss plateaus are normal and adjust your strategy as needed.
  4. Allow yourself flexibility and remember that progress is not always linear.

Can Intermittent Fasting Cause Weight Gain

Is Rapid Weight Gain After Stopping Intermittent Fasting Normal?

Rapid weight gain after stopping intermittent fasting can happen if you don’t transition back to a regular eating pattern mindfully. 

This weight gain might be due to several factors:

1. Overeating

After stopping intermittent fasting, you may feel an urge to overeat or indulge in high-calorie foods during the previously restricted hours. Overeating can cause rapid weight gain, especially if you’re consuming more calories than your body needs.

2. Water Weight

When you stop intermittent fasting, your body might store more glycogen, which binds with water. As glycogen levels increase, so does water retention, leading to an increase in weight (2). This rapid weight gain is usually not due to fat accumulation but rather increased water weight.

3. Decreased Metabolic Rate

Intermittent fasting can temporarily boost your metabolism (8). However, when you stop fasting, your metabolic rate may return to its original state or potentially slow down if you’ve lost significant weight. A slower metabolism can contribute to weight gain over time.

4. Lack Of Portion Control

If you’re not paying attention to portion sizes after stopping intermittent fasting, you may inadvertently consume more calories than you need. This can lead to rapid weight gain, especially if you’re eating calorie-dense foods.

Can Intermittent Fasting Cause Weight Gain

Can Intermittent Fasting Cause Weight Gain: Tips To Consider

To prevent rapid weight gain after stopping intermittent fasting, consider the following tips:

1. Transition Gradually

Ease back into a regular eating pattern by slowly increasing your meal frequency and adjusting portion sizes. This will allow your body to adapt to the change without triggering overeating.

See also
10 Intermittent Fasting Mistakes People Make And How To Avoid Them

2. Maintain A Balanced Diet

Continue to prioritize nutrient-dense, whole foods in your meals, even after stopping intermittent fasting. A balanced diet will help you manage your calorie intake and maintain a healthy weight.

3. Monitor Your Calorie Intake

Keep track of your daily caloric intake to ensure you’re not consuming more calories than your body needs. Adjust your portions and food choices accordingly.

4. Stay Active

Regular physical activity is essential for maintaining a healthy weight (12). Incorporate both cardio and strength training exercises into your routine to support weight management and overall health.

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5. Monitor Your Progress

Keep an eye on your weight and other relevant metrics to ensure you’re maintaining a healthy weight. Make adjustments to your diet and exercise routine as needed.

Remember, it’s normal for your weight to fluctuate slightly after stopping intermittent fasting. Focus on maintaining healthy habits and listening to your body’s needs to prevent rapid weight gain and support long-term weight management. 

Can Intermittent Fasting Cause Weight Gain: The Bottom Line 

Can intermittent fasting cause weight gain? Intermittent fasting can be an effective weight loss strategy for many people, as it may help create a calorie deficit, promote hormonal changes, and improve insulin sensitivity. However, it’s crucial to avoid common mistakes like overeating during eating windows, consuming nutrient-poor foods, and not engaging in regular physical activity to ensure success.

If you decide to stop intermittent fasting, it’s essential to transition back to a regular eating pattern mindfully to avoid rapid weight gain. Focus on maintaining a balanced diet, practicing portion control, staying active, and monitoring your progress to support long-term weight management and overall health. 

Remember that everyone’s body is different, and finding the right balance that works for you is key to achieving and maintaining a healthy weight.


This article is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional advice or help and should not be relied on to make decisions of any kind. Any action you take upon the information presented in this article is strictly at your own risk and responsibility!


  1. Autophagy (2022,
  2. Early weight gain and glycogen-obligated water during nutritional rehabilitation (1982,
  3. Endocrine Changes in Obesity (2022,
  4. Effect of Intermittent Fasting Diet on Glucose and Lipid Metabolism and Insulin Resistance in Patients with Impaired Glucose and Lipid Metabolism: A Systematic Review and Meta-Analysis (2022,
  5. Effects of coffee consumption on glucose metabolism: A systematic review of clinical trials (2019,
  6. Flipping the Metabolic Switch: Understanding and Applying Health Benefits of Fasting (2017,
  7. Intermittent fasting and weight loss (2022,
  8. Intermittent Fasting and Metabolic Health (2022,
  9. Molecular ties between lack of sleep and weight gain (2016,
  10. Obesity and Stress: A Contingent Paralysis (2022,
  11. Optimal Diet Strategies for Weight Loss and Weight Loss Maintenance (2020,
  12. Role of Physical Activity for Weight Loss and Weight Maintenance (2017,
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