This article explains why logging some liquid intakes while fasting can interrupt the fast.
🍵 Some drinks are just liquid meals
A common misconception among fasting practitioners is that food doesn't really count as food if it comes in liquid form. Nonetheless, a lot of soft drinks (like juice or soda) can contain a substantial amount of calories and/or sugar in them.
Even if you don't treat a can of soda as a meal, your body's digestion system most certainly does. That's why your data will record that your current fast will be interrupted if you have a beverage rich in sugar and/or calories — after all, every fast start and ends with a meal, right? And, as we said, your body will treat some liquid intakes as a proper meal.
How to tell fast-breaking beverages in Simple?
Whenever you log a liquid intake, you will notice that every drink which can break a fast will be tagged with This drink will break your fast!, so you can easily tell them from safe intakes.
What should I drink when I’m fasting?
During a fast, we highly recommend that you limit your choice of liquid intakes to the following list:
pure water (or lemon water);
coffee with no milk and no sugar;
tea with no milk and no sugar (herbal and ginger tea are also cool).
On sugar-free sweeteners
Diet soda. While diet soda does not technically contain any sugar and thus will not interrupt your fast, we suggest you avoid having it during a fast. Even without added sugar, a sweet drink can trick your body into starting a digestive process.
Sugar substitutes. The same could be said for any natural sweetener or sugar substitute product; it's best to avoid these during a fast.
Now you know which liquid intake may interrupt your fast. Time to move forward!
If you have any questions or difficulties using the app, we would be happy to assist you—simply open the widget 
in the lower right corner and contact us.