An empty stomach, as the name implies, means not eating, but drinking water, because the stomach normally secretes gastric juice every day. Therefore, drinking water can't hurt the stomach, and the body needs to replenish water, preferably mineral water, not boiled water, which is useless. The shortest time 1 day can clean the stomach and preserve health; Fasting for a short time. If it is the first time, it will be a little sad, which will have a certain effect on detoxification and health preservation. In the middle stage, fast for one day and only drink water. Remember, the first day of fasting is not difficult. The hardest thing is the first day, and the next two days are better than many fasts. The shortest time 1 day, you can fast many times 1 day (each time). It is easier to fast for three days (the interval between three days is 1 day), but you can fast for three days (the interval between each time is about 1.5 months) after you have the foundation and experience of the day. This fasting can be done step by step, so as to go on for a long time, haste makes waste. Me too, day after day, day after day. The method is as follows: breakfast: eat pasta, you can eat some vegetables and chew them up, but don't eat meat. Noon: Eat noodles, the kind with soup, less oil and less seasoning. You can have some vegetables, but you should chew them up so that they can be digested. Evening: After three days, like noon, you can feel fine, but you should eat normally.