Water Fasting
Research, safety and clarity on water fasting and prolonged fasting
Learn how the body responds, assess the risks and see the scientific documentation — before considering a fast.
How we communicate
- This we know.
- This is uncertain.
- This we do not know.
- This requires an individual professional assessment.
Quick overview
Types of fasting
Evidence about one type cannot be transferred to another. Every study and AI answer is labeled with the fasting type it concerns.
1. Time-restricted eating
Eating within a daily window, e.g. 8–10 hours.
2. Intermittent fasting
Recurring fasting periods, e.g. 5:2 or alternate days.
3. Whole-day fasting
Roughly 24–48 hours without food.
4. Prolonged fasting
More than 48 hours, often with some energy intake.
5. Water-only fasting
Only water — no energy intake.
Search water fasting
Find it in the app's own water-fasting texts — with the evidence level where stated.
The search runs in your own browser and only uses the app's own content — nothing is sent anywhere.
How we label the documentation
All health content carries a visible evidence level, so you can see how solid a statement is.