Weight gain or weight gain is when energy intake exceeds energy expenditure and excess energy is stored in the body. It is usually the method used by the thin people. Can be from a healthy diet, reasonable exercise and improve living habits in three areas with each other to complete weight gain: 1, healthy diet: to avoid partial diet, to ensure that the diet is scientific, reasonable and adequate. Ensure protein, fat and carbohydrate intake, with high protein, high calorie, easy to digest diet. Eat more staple foods, such as steamed buns, noodles, rice, etc., and more high-protein foods, such as eggs, milk, beef, fish, shrimp, soy products, etc. Also increase the intake of high-calorie foods in moderation, such as cakes, chocolate, snacks, cookies, etc., while ensuring adequate daily intake of fruits and vegetables. Need to avoid eating too much greasy, fried food in order to gain weight, which is not conducive to weight gain, too much intake is also likely to increase the gastrointestinal burden. Also need to avoid overeating, moderate diet, it is recommended that a professional nutritionist to develop a reasonable fattening meal; 2, reasonable exercise: increase the diet at the same time, the need for appropriate exercise to promote the body’s metabolism, help digestion and absorption, aerobic exercise can be carried out, such as running, swimming, climbing, etc., to ensure that the amount of daily exercise, reasonable fattening; 3, improve living habits: maintain healthy habits for fattening is also very important The first thing is to ensure adequate sleep, avoid staying up late, high-quality sleep can promote the secretion of human growth hormone. Secondly, we must also maintain a happy mood, avoid anxiety or stress, otherwise it is not conducive to weight gain. It is important to note that if you are suffering from certain diseases, such as diabetes, hyperthyroidism, tuberculosis and gastrointestinal diseases that cause wasting, and need to gain weight, it is recommended to first treat the cause of the disease, on the basis of which adjust the diet, do not blindly gain weight.