You can't eat too much if you don't want to be fat. Every food you eat is energy. If you can't consume a certain amount of energy through exercise, the fat in food will be stored and you will get fat. To lose weight, you must exercise more than you take in.

Give you some advice:

There are no restrictions on eating, but you can choose to eat more fruits and vegetables and less meat and staple food.

The best exercise is running. You don't have to run too much every day, just 3000 meters. Don't run straight down in the middle. Don't squat down and walk to the left after running, and then walk slowly 500 meters home. If you insist, one month will do, and you will come to me in three months.

It is best not to eat after 8 o'clock in the evening, but to drink more water at ordinary times.