can i drink diet pepsi while intermittent fasting

Can I Drink Diet Pepsi While Intermittent Fasting?

Written by Andrew Brewer. ⚕️Reviewed and fact checked by our medical team.

can i drink diet pepsi while intermittent fasting

When you’re on intermittent fasting, you can’t drink any beverages with calories during your fasting window. Since Diet Pepsi doesn’t have calories, it is technically okay to drink during intermittent fasting. However, some health professionals think it might not be a good idea.

Diet sodas can prompt food cravings. If you’re struggling to avoid eating during your fasting window, diet soda won’t help, and there are other beverages you can drink that will reduce food cravings.

It’s essential to stay hydrated during intermittent fasting, but everything you put into your body affects you. As you become more conscious of your food and beverage choices during intermittent fasting, you make healthier decisions.

Key Takeaways

  • Drinking diet soda during intermittent fasting is technically allowed since it does not contain calories. However, it can increase food cravings, especially for women and obese people, according to a study published in the Journal of the American Medical Association.
  • Staying hydrated during fasting is crucial for maintaining normal body functions and regulating temperature, blood pressure, and joint health. Consuming foods and beverages rich in electrolytes, such as coconut water, milk, juices, and sports drinks, can help maintain electrolyte balance.
  • To promote faster weight loss and achieve the desired results, it’s essential to make healthier beverage choices during intermittent fasting. This can involve consuming natural appetite suppressants like fiber-rich foods and protein and avoiding drinks with added sugars or artificial sweeteners that can disrupt normal body functions and increase the risk of chronic diseases.

Studies Show That Diet Sodas Promote Food Cravings

If you’re a soda drinker, that fizz is a special treat, and nothing hits quite the same way. It turns out that drinking sodas activates the reward center in your brain and can increase your food cravings.

A study published in the Journal of the American Medical Association found that beverages with sucralose can increase your food cravings, particularly for women and obese people. For these groups, their body reduced production of the hormone that inhibits appetite, and they ate more after drinking beverages with sucralose.

The study showed that it didn’t have the same effect on men, but more examination of sucralose’s impact on the brain may be necessary. It seems that sucralose confuses some people’s brains and causes them to want to eat more, and that’s important news for everyone.

The Importance of Staying Hydrated

Even if you’re not fasting, staying hydrated is extremely important for your health. Many of the health symptoms that people have can be traced back to dehydration.

The Benefits of Staying Hydrated

Drinking beverages with sugar or sucralose can keep us from staying adequately hydrated and actually do more harm than good. Your body needs plenty of water for normal body functions.

Staying hydrated helps your body regulate its temperature and can help improve your blood pressure. It keeps your joints from swelling, staves off infections, and keeps your internal organs healthy. Drinking plenty of water helps you sleep better, improves your moods, and increases mental clarity.

Increased Need for Fluids During Fasting

Your body will experience an increased need for fluids during fasting because of a process called natriuresis that happens when your body burns fat. Salts are released into the bloodstream when your body burns fat, which attracts fluids.

Your body will need to consume more fluids as your system flushes out the salts and waste. Consuming foods and drinks rich in electrolytes is also essential to maintain a balance.

Increase Your Electrolyte Intake

Electrolytes help your body maintain its essential functions, and it needs electrolytes for nerve signaling, pH balance, and muscle contraction. Heavy exercise or excessive vomiting and diarrhea can create electrolyte deficiencies.

When you’re fasting, your body isn’t getting a regular dose of electrolytes. Any fast longer than 12 hours can create an electrolyte deficiency, and prolonged fasts will cause your body to be depleted.

Be sure to consume foods and beverages that are rich in electrolytes. Beverages like coconut water, milk, juices, and sports drinks are high in electrolytes.


Weight loss is hard work. It’s hard for your body, and it’s hard to maintain an intermittent fasting plan. Taking excellent care of your body will promote faster weight loss.

Using a fasting app can help make intermittent fasting easier. Fasting apps can help you keep track of your fasting windows, track your meals, and log your moods and energy levels. Some apps have fun features like badges and monthly challenges to inspire you to keep going.


  • Can I drink Diet Pepsi while intermittent fasting?

Yes, you can drink Diet Pepsi while intermittent fasting, as it contains zero calories and won’t break your fast.

  • Can Diet Pepsi spike insulin levels during intermittent fasting?

No, Diet Pepsi contains no carbohydrates or calories that could spike insulin levels.

  • Will drinking Diet Pepsi during intermittent fasting cause hunger cravings?

Everyone’s body is different, but Diet Pepsi contains caffeine which can suppress appetite and reduce hunger cravings for some people.

  • Can Diet Pepsi help with weight loss during intermittent fasting?

Diet Pepsi contains zero calories, which can help you stay within your calorie deficit while intermittent fasting, potentially leading to weight loss.

  • Are there any negative effects of drinking Diet Pepsi while intermittent fasting?

Some people may experience negative effects from artificial sweeteners like those found in Diet Pepsi, including digestive issues and headaches. However, these effects are typically mild and rare.

  • Can I drink other diet sodas during intermittent fasting?

Yes, other diet sodas that contain zero calories and no carbohydrates can also be consumed during intermittent fasting.

Andrew Brewer

Andrew Brewer

Andrew Brewer started to give people the guidance that he never received when he was first starting. His goal is to make your goals achievable and to offer you only the best fasting apps that the internet has to offer. You're not on your own - Andrew and the entire family of reviewers at are here with you every step of the way!