top of page
  • frank49709

Can you lose weight with intermittent fasting?

Intermittent fasting has become a popular health and fitness trend in recent years. It's not just another diet fad but a lifestyle change many people have adopted to lose weight, improve their health, and simplify their lifestyles. Unlike traditional diets that focus on what to eat, intermittent fasting is about when to eat.

lose weight with intermittent fasting
Is intermittent fasting right for you?

Understanding Intermittent Fasting

Intermittent fasting is a pattern of eating that cycles between periods of fasting and eating. It doesn't specify which foods you should eat but when you should eat them. There are several different types of intermittent fasting, including the 16/8 method (fasting for 16 hours and eating during an 8-hour window), the 5:2 diet (eating normally for five days of the week and restricting calories to 500-600 on two days), and Eat-Stop-Eat (involves a 24-hour fast once or twice a week).

The science behind intermittent fasting lies in the way our bodies function. When we eat, our body spends a few hours processing the food, burning what it can from what we just consumed. Because it has this readily-available, easy-to-burn energy in its bloodstream, thanks to the food we eat, our bodies will use it as energy rather than the fat we have stored. This is especially true if we use carbohydrates/sugar, as our bodies love to burn sugar instead of fat. But, if we fast (stop eating) for a significant amount of time, our body has no choice but to dig into our stored fat for energy. Hence, we lose weight.

With that being said, there are a few drawbacks or possible side effects to consider when it comes to intermittent fasting:

  1. Hunger and Cravings: When you reduce your calorie intake or go long periods without eating, you may experience increased appetite. This is a common side effect, especially during the initial days of intermittent fasting. However, these symptoms may resolve as your body adapts to regular fasting periods.

  2. Headaches and Lightheadedness: Headaches are a common side effect of intermittent fasting, typically occurring during the first few days of a fasting protocol. Low blood sugar and caffeine withdrawal may contribute to headaches during intermittent fasting.

  3. Digestive Issues: Digestive issues, including constipation, diarrhea, nausea, and bloating, are symptoms you might experience if you do intermittent fasting. The reduced food intake with some intermittent fasting regimens may negatively affect your digestion.

  4. Irritability and Mood Changes: Some people may experience irritability and other mood disturbances while practicing intermittent fasting. Low blood sugar, or hypoglycemia, can occur during periods of calorie restriction or over periods of fasting. This can lead to irritability, anxiety, and poor concentration.

  5. Fatigue and Low Energy: Some people practicing various methods of intermittent fasting experience fatigue and low energy levels. Low blood sugar related to intermittent fasting can cause you to feel tired and weak. Plus, intermittent fasting may lead to sleep disturbances in some people, which can cause tiredness during the day.

  6. Bad Breath: Bad breath is an unpleasant side effect that can occur in some people during intermittent fasting. This is caused by a lack of salivary flow and the rise of acetone in the breath, a by-product of fat metabolism, so it increases in your blood and breath during fasting.

  7. Sleep Disturbances: Some research suggests that sleep disturbances, such as being unable to fall or stay asleep, are among the most common side effects of intermittent fasting.

Please note that these side effects may not occur in everyone and can vary based on individual factors. It's also important to note that intermittent fasting is not suitable for everyone, especially those with certain health conditions. Always consult a healthcare provider before starting any new diet or eating regimen.


Now that we've discussed the potential benefits and disadvantages of intermittent fasting let's delve into some practical tips and strategies for those considering this approach to weight loss.

1. Choose the Right Fasting Method for You:

  • The 16/8 Method (Leangains protocol): This method involves fasting every day for 14-16 hours and restricting your daily eating window to 8-10 hours. You can fit two, three, or more meals within the eating window. This is one of the most popular intermittent fasting methods, perhaps because it's quite flexible and can be easier for beginners to start with. For example, if you finish dinner by 8 p.m., you wouldn't eat again until noon the next day.

  • The 5:2 Diet: With this method, you consume only 500-600 calories on two non-consecutive days of the week but eat normally the other five days. For example, you might eat normally every day except Tuesdays and Fridays, where you eat two small meals (250 calories per meal for women and 300 for men).

  • Eat-Stop-Eat: This involves a 24-hour fast once or twice a week. For example, if you finish dinner at 7 p.m., you wouldn't eat again until dinner the next day. This method can be more challenging and may require more willpower than the other methods.

  • Alternate-Day Fasting: As the name suggests, you fast every other day. Some versions allow about 500 calories on fasting days. This method is more extreme and could potentially lead to side effects or nutritional deficiencies if not properly managed.

  • The Warrior Diet: This diet involves eating small amounts of raw fruits and vegetables during the day and one huge meal at night, basically fasting during the day and feasting at night within a four-hour window.

Choosing the right method depends on your lifestyle, health status, and personal preferences. For instance, if you're a morning person who loves breakfast, the 16/8 method of skipping breakfast might not be for you. On the other hand, if you're not usually hungry in the morning or are already used to skipping breakfast, it might be a perfect fit.

If you prefer to eat smaller meals throughout the day, the 5:2 diet might be a better option. This method allows you to eat small amounts on your fasting days, which might help you manage hunger and maintain energy levels.

It's also important to consider your schedule. Certain methods might be easier to stick to if you have a regular 9-5 job. For example, the 16/8 method could be a good fit since you can eat breakfast later, have lunch as usual, and eat dinner before 8 p.m.

Remember, the goal is to find a method that feels sustainable to you. It's not about choosing the "best" method or the one that will make you lose weight the fastest. It's about finding a strategy that fits into your lifestyle and that you can stick with in the long term. Always consult a healthcare provider before starting a new diet or eating regimen.

2. Stay Hydrated: During your fasting periods, it's crucial to stay hydrated.

Hydration is a key aspect of any diet or health regimen, and it's vital when you're fasting.

Here's why:

During fasting periods, you're not taking in any food or beverages (except for water and other non-caloric drinks), which can potentially lead to dehydration. Dehydration can cause various symptoms, including fatigue, dizziness, and confusion, making you feel hungrier than you actually are.

Here are some tips to ensure you stay hydrated during intermittent fasting:

  • Drink Plenty of Water: Water should be your go-to beverage during fasting periods. It's calorie-free, helps to stave off hunger, and keeps your body functioning properly. Aim to drink at least 8-10 glasses of water daily, but remember that individual needs can vary.

  • Don't Wait Until You're Thirsty: If you're already feeling thirsty, it's likely that your body is already slightly dehydrated. Always drink water consistently throughout the day, even if you don't feel thirsty.

  • Hydrate with Other Non-Caloric Beverages: Besides water, you can also drink other non-caloric beverages to stay hydrated. This includes black coffee, herbal tea, and bone broth. However, be mindful of your intake of these beverages, as too much caffeine can lead to dehydration, and bone broth can be high in sodium.

  • Eat Hydrating Foods: Once your eating window begins, opt for foods high in water content. Fruits and vegetables like cucumbers, watermelon, oranges, and strawberries are great choices.

  • Listen to Your Body: Everyone's hydration needs differ, so listening to your body is important. If you're feeling thirsty, drink up. If you're feeling lightheaded or dizzy, it could be a sign that you're dehydrated.

Remember, staying hydrated is crucial for your overall health and can help you navigate fasting periods more comfortably. It can also help prevent some side effects associated with fasting, such as headaches and constipation.

3. Eat Nutrient-Dense Foods: Maintaining a balanced and nutrient-rich diet is important. Ensure that your meals include a variety of protein, fiber, and healthy fats to promote satiety and provide your body with essential nutrients. Nutrient-dense foods offer a high concentration of nutrients with fewer calories. These foods are rich in vitamins, minerals, complex carbohydrates, lean protein, and healthy fats. By consuming nutrient-dense foods, you can meet your body's nutritional requirements while still managing your calorie intake. This is especially vital during intermittent fasting when your eating time is limited.

Here are some tips to ensure you're consuming nutrient-dense foods during your eating window:

  • Opt for Whole Foods: Whole foods, such as fruits, vegetables, lean proteins, and whole grains, are packed with essential nutrients. They are much healthier than processed foods, which often contain empty calories in the form of added sugars and unhealthy fats.

  • Include Lean Proteins: Proteins are essential for repairing and building muscle tissues. Lean proteins, such as poultry, fish, eggs, and legumes, provide you with the necessary protein without the extra saturated fat found in fattier cuts of meat.

  • Eat Plenty of Fruits and Vegetables: Fruits and vegetables are high in vitamins, minerals, and fiber but low in calories. They are excellent sources of antioxidants, which can protect your body against damage from harmful molecules called free radicals.

  • Choose Healthy Fats: Not all fats are bad. Healthy fats, such as those found in avocados, nuts, seeds, and fatty fish, are essential for your body to absorb certain vitamins and produce hormones.

  • Don't Forget About Whole Grains: Whole grains are a great source of fiber and other nutrients. They can help control blood sugar, make you feel full, and aid in digestion.

  • Stay Hydrated with Water: While not a food, water is a crucial part of your diet. Staying hydrated helps your body function properly and can help control hunger.

  • Limit Added Sugars and Processed Foods: While these might be tempting, they often contain empty calories and can lead to weight gain, blood sugar problems, and other health issues.

Remember, the goal of intermittent fasting isn't to starve yourself but to create a healthier eating pattern.

By choosing nutrient-dense foods, you can ensure your body gets the necessary nutrients it needs to function properly, even on fasting days.

4. Listen to your body: It's common to hear the phrase "Listen to your body," but what does it really mean? Essentially, it's important to pay attention to how you're feeling. If you're experiencing discomfort or stress while fasting, it's crucial to acknowledge these signals and prioritize your well-being. Intermittent fasting may not suit everyone, and stopping if it doesn't work for you is okay. Listening to your body is fundamental to any dietary or lifestyle change, including intermittent fasting. This involves being attuned to your body's cues and taking appropriate action. Here are some ways you can practice this while fasting:

  • Understand Hunger Signals: During your fasting periods, it's normal to feel some level of hunger. However, it's important to distinguish between true hunger and habitual eating. True hunger is your body's way of telling you it needs nutrients, while factors like boredom, stress, or the sight and smell of food often trigger habitual eating.

  • Monitor Your Energy Levels: If you're feeling excessively tired or weak during your fasting periods, it might be a sign that you're not getting enough calories or nutrients during your eating windows. In such cases, you may need to adjust your meal plan or eating window.

  • Pay Attention to Mood Changes: Changes in diet can sometimes affect your mood. If you're feeling irritable, anxious, or depressed, it could be a sign that your body is not adapting well to intermittent fasting. It's important to address these issues early, as they can impact your overall well-being and the sustainability of your diet plan.

  • Check Your Physical Performance: If you're finding it hard to maintain your usual level of physical activity or if you're not recovering well from your workouts, these could be signs that you're not fueling your body properly. You might need to adjust your eating window to better align with your workout schedule or increase your intake of certain nutrients.

  • Look Out for Signs of Stress: Fasting is a form of stress that can positively affect the body. However, when combined with other forms of stress, it can lead to issues like poor sleep, hormonal imbalances, or weakened immunity. If you're experiencing these symptoms, it might be a sign that you need to modify your fasting regimen or incorporate stress management techniques into your routine.

  • Regular Health Check-ups: Regular health check-ups can help monitor how your body responds to intermittent fasting. Keep an eye on key health markers like blood pressure, blood sugar, and cholesterol levels.

Remember, everyone's body responds differently to intermittent fasting. What works for one person might not work for another. The key is to listen to your body and adjust your approach as needed. Always consult a healthcare professional if you're unsure or experiencing persistent discomfort or negative side effects.

5. Consult a Healthcare Professional: Before starting any new diet plan, including intermittent fasting, it's always a good idea to consult a healthcare professional. They can provide personalized advice and guidance based on your individual health needs and goals.

To sum up, intermittent fasting is a useful way to lose weight and enhance your health, but it has some potential drawbacks. It's essential to approach this diet with a balanced view and an unwavering commitment to maintaining your overall health and well-being. Just like any other lifestyle or diet change, individual experiences with intermittent fasting can differ significantly. What works well for one person may not work as effectively for another. It's always vital to seek advice from a healthcare provider before starting any new diet or eating routine.

Always remember that the aim of any diet should not solely be weight loss but also the promotion of long-term health and wellness.

Intermittent fasting, when done correctly, can be a part of a balanced and healthy lifestyle. However, it's also crucial to combine this eating pattern with other healthy habits, such as regular physical activity, sufficient sleep, and stress management. In the end, the best diet is the one that you can maintain, that matches your lifestyle, and that helps you achieve your health objectives.


Please note that while these sources provided valuable information, the blog post was written in my own words and includes general advice and information that is widely accepted in the field of nutrition and dietetics. Always consult with a healthcare provider for personalized advice.


bottom of page