For most people, short-term water fasting is generally safe when used correctly. A 2018 study reported minimal risks, with common side effects including fatigue, headaches, and sleep disturbances.
However, prolonged fasting beyond three days can impair kidney function and should only be done under medical supervision.
Doctors advise against water fasting for children, pregnant women, people with certain types of diabetes, or people with a history of eating disorders.
Possible risks and side effects
While water fasting has benefits, it also has potential disadvantages, such as:
- Temporary fatigue, headaches and indigestion
- The possibility of overeating after fasting
- Increased risks for people with pre-existing medical conditions
Prolonged fasting (more than three days) should be approached with caution and carried out under medical supervision.
How to water really quickly
For a safe fasting experience, it is recommended to drink 2 to 3 liters of water daily. While shorter fasts (1 to 3 days) are generally safe, longer fasts require professional supervision.
Before fasting:
Reduce food intake gradually to help your body adjust.
Avoid alcohol, caffeine and foods high in sugar.
Before fasting, focus on eating nutrient-rich fruits and vegetables.
After fasting:
Break the fast gradually with juices, bone broth, or soft fruits and vegetables.
To prevent digestive problems, reintroduce solid food slowly over the next few days.
Tips for a successful water fast
- Avoid strenuous activities or stressful situations.
- Start your fast slowly rather than stopping eating abruptly.
- Do not fast if you are feeling unwell or recovering from an illness.
- Make sure you drink enough fluids and listen to your body’s signals.
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