Of course it's fake. If you want to lose weight without rebounding, you must always adhere to the diet during weight loss. If ordinary people are not born with poor gastrointestinal absorption or special genes, they will definitely get fat if they eat too much. And once you lose weight successfully and feel that you can eat and drink, then this is the beginning of your weight gain. The energy you eat won't disappear for no reason, and after you lose weight successfully, your basal metabolism will be reduced accordingly because of your weight loss, so you won't get fat unless you keep eating during weight loss.