In today's world, obesity and overweight have become an epidemic. This epidemic has a heavy burden both in terms of cost and mental health for individuals and society. We always see many people who are following different diets and using slimming devices, and they are even willing to accept the risk of various surgeries to achieve body fitness. Unfortunately, many people, after that difficult and sometimes exhausting period, only maintain their body fitness for a short time and then quickly regain weight.