On the one hand, you should undergo a comprehensive health assessment to find the reasons for your thin weight, and take targeted weight gain methods according to the reasons for your thinness; on the other hand, through a healthy lifestyle, gradually and gradually, your weight will increase slowly to reach a standard healthy weight. There are many ways to increase weight: 1. Nutritious diet: eat more fatty, starchy and high protein foods in daily life as appropriate. These nutritional elements can not only give people additional energy and enhance physical fitness, but also play a role in increasing body weight; 2, to develop a good lifestyle: appropriate exercise, avoid excessive exercise to consume calories, and at the same time should be regular rest and rest, to ensure adequate sleep, and some people who smoke and drink should quit smoking and limit alcohol; 3, taking nutritional products: increase body weight by taking nutritional products, such as enteral nutrition preparations or protein powder 4, active treatment of disease: some people by the disease caused by thinning, such as diabetes, hyperthyroidism, tumors, etc., then need to actively treat the original disease.