Don't eat for 24 hours, just drink water. Just water, including all kinds of mineral water, pure water and so on. , excluding drinks. Because water can be directly absorbed by the human body, there are other things to digest and absorb, such as cellulose and protein. It requires the body to produce corresponding enzymes to help digestion and absorption. Drinks contain sugar, pulp and other ingredients. Therefore, drinking only water on an empty stomach will not cause extra burden to the body. 2, the amount and temperature of drinking water:
The amount of water you drink every day is more than twice the usual amount, that is, you should drink 1200ml- 1500ml at ordinary times and 2400-3000ml on an empty stomach. The water temperature should be kept at the indoor temperature of 20-25℃, that is, don't drink too cold or too hot water.