Reduce the intake of starch and meat every day, but you can't help eating (the human body still needs some nutrition). I think you can eat and drink according to the following plan:

Solution: The first thing after getting up in the morning is to drink a cup of warm water and start eating breakfast after 20 or 30 minutes. A bowl of porridge (preserved eggs and lean meat, millet porridge, red dates and tremella soup, shredded pork porridge with mushrooms ...), a kind of fruit (apples, pears, kiwis ...) and a piece of bread.

Breakfast should have staple food, complementary food and fruit, which can ensure your nutrition for a day.

Noon: If you are at school, you can eat the school canteen. Try to order something light. If you need to lose a lot of weight, you can skip the meat. Can eat: shredded lettuce, scrambled eggs with tomatoes, mushrooms and other dishes such as Flammulina velutipes, mushrooms, Coprinus comatus, you can eat more fungus.

These dishes have the effect of losing weight and are not high in calories. It can not only ensure your nutrition, but also make you lose weight.

Evening: This is the time to test your willpower. If you are not so hungry, you can choose to drink a cup of yogurt or a cup of honey water. If you think this is not enough, you can add another plate of vegetables, such as vegetables, zucchini and cucumber slices.

This will ensure that you won't get fat because you rest immediately after overeating.

As for exercise, you have already reported to the gym. I don't recommend you to increase too much exercise. However, you can do 100 leg lifts before going to bed and keep lifting your legs for 5 minutes.