My method is:
1 Eat many meals every day, with few meals, at least five meals a day. The purpose of this is to ensure the normal nutrient intake of the human body and prevent the body from accumulating fat. On the contrary, eating more and eating less will accumulate fat, and athletes in Japanese elephant park just eat more and eat less.
Exercise more. It's not necessarily strenuous exercise, just exercise. I exercise for a long time every day. I walk to and from work every day, plus I take time to walk, which is about 3 hours on average every day.
It is ok to do other sports, but it is not easy to stick to it.
You can also wear less clothes appropriately, as long as you don't get sick, don't wear too much. Cold also consumes a certain amount of heat.