There are ways to lose weight and gain weight. Healthy weight gain means exercise plus a healthy diet. You must exercise. Some people eat nothing. Exercise can stimulate their appetite. Of course, eating high sugar, high fever and high cholesterol is not good for anyone. To eat healthy food, you usually have to eat coarse grains at a ratio of more than 6: 4, which means you can't just eat coarse grains. Eating too much cellulose will accelerate gastrointestinal peristalsis and reduce absorption efficiency. Eating too much cellulose will stimulate the stomach and cause a burden.
Summary: You should exercise more when you gain weight, and you should eat healthily whether you lose weight, gain weight or keep it.