After drinking, I felt useless, but at that time I basically didn't eat for a day and lost a lot of weight, so I'd better eat less and exercise more, dear. Black coffee seems to hurt my stomach, but I bought it very cheaply online, which varies from person to person. Anyway, you can try it. It's not expensive, but it mainly depends on your willpower. If you really want to be thin, don't hurt yourself like this. Stick to 80% fullness and exercise more, and you will really lose weight. The key is to form a good habit.