1. Eat less and eat more meals instead of increasing the amount of food per meal. Choose nutritious foods, that is, foods rich in vitamins, minerals and calories. You are underweight because you can't get all the vitamins and minerals your body needs, especially iron. You must eat a lot of foods with high nutrition, low cholesterol and low unsaturated fatty acids, such as lean meat, fish, low-fat dairy products, fruits, vegetables and bean products, supplemented by high-calorie foods (such as sweets) and high-fat foods (such as margarine).

Eat whatever you want, not just for "necessity". Don't just eat dessert (such as ice cream, milk, cake, etc.). ), you should eat more ordinary food, such as sesame cake, cheese, raisin bread, cream and so on. As long as it suits your taste, whether it's chewing, smoking, cold, hot or creamy, as long as you like it, just enjoy it.

3. The secret of eating high-calorie food. Skim milk powder with juice, sandwiches with butter, pork floss, fried ribs with two spoonfuls of cream can all consume more calories. You can also choose high-calorie foods and mix high-calorie and low-calorie foods, such as tortillas with coffee or tea.

4. imitate the skills of dieters, but use them in reverse. For example, put ready-to-eat food or snacks at home, school or office. Put some raisins, walnuts or snacks in the glass jar; Put some cheese and ice cream in the refrigerator; Put some ready-to-eat fruits in the basket on the dining table; Put some chocolate, walnuts, potato chips, biscuits, etc. In your wallet, you can eat at any time.

Pay more attention to your oral health. Eat more snacks and pay more attention to your oral hygiene. You must brush your teeth and rinse your mouth more often than usual. Eat less sticky sweets.