You can't live without eating. You can try not to eat for a week. I only drink water and don't eat for a week. Occasionally eat fruit cucumber, thin 15 kg. But I feel that most of the loss is water, not fat. I was an athlete and needed to lose weight near the competition. However, this method is very harmful. You can try jogging for an hour every day, because sweating for 20 minutes will burn fat, and the more tired you are, the more you burn. It may be because the body has not adapted to it for a few days, but it will be effective if it persists for 10 days. There is hope to cooperate with other fitness.