Generally speaking, you are not allowed to eat any food for three days before losing weight. Can only drink raw water. Ensure at least 800 ml of water every day, and then eat some vegetables and fruits after three days. Only by persisting for a long time can we see the effect of breaking the valley. However, for some obese people, it is not suitable for a complete hunger strike. At this time, you can eat some porridge, vegetables or fruits appropriately to meet your basic nutritional needs.