Can You Drink Diet Soda While Intermittent Fasting?

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

Can You Drink Diet Soda While Intermittent Fasting

Drinking diet soda is something that many Americans struggle with. It’s an addictive drink that provides a small amount of energy and is marketed as the healthy alternative to everyone’s favorite sugary beverage. Diet soda tastes great and offers none of the drawbacks of regular soda, right? Unfortunately, that school of thought might not necessarily be true.

But is it at least okay to drink diet soda while intermittent fasting? Many diet sodas are low in sugar, have 0 calories, and offer healthier ingredients than their regular counterparts. Again, that, unfortunately, doesn’t make them the healthy alternative. Drinking diet soda impacts your body in different ways that can make intermittent fasting nearly impossible.

Let’s take a look at what makes diet soda so difficult for your body to process and why it shouldn’t be part of your intermittent fasting menu.

Key Takeaways

  • Diet soda, while marketed as a healthy alternative to regular soda, is not a recommended drink during intermittent fasting as it contains artificial sweeteners that can impact weight loss and insulin production.
  • Drinking diet soda can break a fast quickly, even if it has zero calories, as insulin production can be triggered by artificial sweeteners.
  • Cutting both regular and diet soda is one of the fastest ways to lose weight, along with intermittent fasting.
  • Alternatives to soda during intermittent fasting include plain tea, coffee, and lemon-infused water, which can provide flavor and nutrients while helping distract from hunger and cravings.
  • Intermittent fasting apps can be helpful in tracking your fasting and eating windows and making your intermittent fasting journey easier.

“Diet” Soda

While it’s true that some diet sodas have zero sugar and zero calories, it’s also true that diet sodas are packed with artificial sweeteners which have been tied to obstructing weight loss. Sweeteners like aspartame could even cause weight gain which is certainly not what you want if you’re intermittent fasting. Don’t make the weight loss process harder on yourself with diet sodas.

But how do they compare to regular sodas when it comes to weight loss? This is a debate of calories versus artificial substances and how they impact the body. Diet soda might not have any calories, but calories aren’t the only things that lead to weight gain. So as unfortunate as it is, cutting both regular and diet sodas is one of the fastest ways to lose weight along with intermittent fasting.

Drinking While Fasting

Let’s take a look at what happens to your body when you drink a diet soda while intermittent fasting. For starters, diet soda will break your fast pretty quickly. One of the most popular determining factors for fast-breaking is the 50 calorie threshold – if you have more than 50 calories, then your fast is broken. But, as we’ve mentioned, calories aren’t the only fast breakers.

Insulin production is another major factor in breaking your fast as many supplements are designed to trigger production and break a fast. The artificial sweeteners can quickly activate insulin production which leads to your fast-breaking. Diet sodas might even be more effective at fast-breaking than their regular counterparts.

If you’re looking to avoid breaking your fast and assisting your body in quick weight loss, then diet soda should be cut from the menu. It’s quite effective at promoting weight gain which essentially makes it an obstacle for intermittent fasting.

Popular Alternatives For Intermittent Fasters

We all have that sweet tooth that regular water simply cannot calm, that’s why so many of us are soda and diet soda drinkers. But, it’s just not an acceptable intermittent fasting drink for our bodies. It negates the benefits of intermittent fasting and makes weight loss much more difficult. Luckily, there are some alternatives to diet sodas that aren’t water!

If you’re looking for that blast of flavor throughout your fast that water can’t provide, then you’re in luck. Intermittent fasters can enjoy teas, coffee, and even a splash of lemon in their water. While it is a far cry from soda and its sweet flavoring, these healthy alternatives will be just what your body needs to make it through the fasting window.

Plain tea and coffee provide many of the nutrients our bodies need while helping to distract our brains from hunger and cravings. They’re the perfect bridge between the fasting period and eating. Once your eating window returns, you can have diet sodas again, but be sure to limit the amount you’re drinking.

Don’t forget to check our recommended intermittent fasting apps to make your intermittent fasting journey easier.


  • Can you drink diet soda while intermittent fasting?

Yes, you can drink diet soda while intermittent fasting, as it contains zero calories and no nutritional value.

  • Does drinking diet soda break your fast?

No, drinking diet soda does not break your fast because it contains zero calories and no nutritional value. However, some experts suggest avoiding artificial sweeteners during fasting.

  • Can diet soda affect weight loss during intermittent fasting?

While diet soda contains zero calories, some studies suggest that artificial sweeteners can cause cravings and lead to overeating, impacting weight loss during intermittent fasting.

  • Is diet soda healthier than regular soda?

Diet soda is lower in calories and sugar than regular soda, benefiting those trying to lose weight or manage their blood sugar levels. However, some studies have suggested that diet soda may have negative health effects.

  • What other beverages can you consume while intermittent fasting?

You can consume plain water, black coffee, and unsweetened tea while intermittent fasting. Some experts also suggest drinking bone broth or other low-calorie, low-carbohydrate beverages.

  • What should I avoid consuming while intermittent fasting?

You should avoid consuming food or beverages containing calories or sugar while intermittent fasting. This includes most types of juice, milk, and other sweetened beverages.

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!