Yso black gold coffee, soak a bag of coffee with 100 ml warm water half an hour before breakfast, drink water immediately after drinking, drink more water at ordinary times, and don't drink too much at night, which is easy to edema and will not lose weight or gain weight.

Note: It is not recommended to drink coffee on an empty stomach, which may easily irritate the stomach and cause gastritis. When drinking coffee, whether it is hot or cold, you should drink some boiled water after drinking it.