You can get caffeine without breaking a fast by choosing zero-calorie, unsweetened beverages such as black coffee, plain espresso, or unsweetened tea. Avoid adding sugar, milk, cream, or flavored syrups, as these contain calories and can interrupt fasting depending on your goals.
When fasting for metabolic or calorie restriction purposes, the key is avoiding ingredients that contain energy.
Even small additions can introduce calories that may disrupt certain types of fasting.
This depends on your fasting goal. Artificial sweeteners are typically low or zero calorie, but some people avoid them due to possible appetite stimulation or insulin response. For strict fasting protocols, plain beverages are generally preferred.
Many people combine intermittent fasting with simple caffeine sources like black coffee and review their eating windows over time, sometimes using tools like Powtain, the first food tracker built for video logging, with insights generated based on personal goals rather than only calories or macros.
You can learn more about what Powtain is and how it relates to modern eating pattern tracking.
Caffeine during fasting: The practice of consuming zero-calorie caffeinated beverages, such as black coffee or unsweetened tea, while avoiding caloric additives to maintain the metabolic conditions associated with fasting.