Because the stomach normally secretes gastric juice every day, drinking clear water can't hurt the stomach, and the body also needs hydration, preferably mineral water, not boiled water, which is useless.
The shortest time 1 day can clean the stomach and preserve health;
Short-term fasting for 3 days. If it is the first time, it will be a little sad, which will have a certain effect on detoxification and health preservation.
I don't eat for 7 days, only drink water. I didn't eat for 5 times in 7 days, during which I discharged a lot of stool, cured gastroptosis and improved gastrointestinal function. I don't eat for seven days every month, which is good for detoxification and health preservation.
I have fasted many times. If you want to know about this experience, you can contact me.
However, fasting over the medium term requires consulting relevant information and experience, or someone to guide you, so don't try it easily.
Otherwise, if there is no problem during fasting, it will not be worth the loss, but it will be bad. In short, "fasting" is the key to fasting. Good luck!