Eat not fat if because of physiological reasons, generally can be adjusted by adjusting the diet, improve lifestyle, appropriate exercise and so on to regulate; if caused by consumptive diseases, should be actively treating the disease at the same time. 1. Physiological reasons (1) Adjust the diet: it is recommended that the skinny people, can be appropriate to more intake of high energy food or staple food, such as meat, rice, steamed buns nuts, etc., or more intake of high-quality protein, such as milk, lean meat and so on. (2) improve lifestyle: usually to regular work and rest, avoid staying up late, etc., should also maintain a positive and optimistic mindset, read more books, listen to music, help to avoid, anxiety, depression mood. (3) appropriate exercise: it is recommended that usually also appropriate exercise, such as squatting, sit-ups, etc., not only can exercise muscles, but also to increase body weight. 2. Diseases: clinically, there are many diseases that can lead to wasting, such as diabetes, tuberculosis and so on. (1) Diabetes mellitus: It is mostly incurable and requires comprehensive management. The five points of comprehensive management of diabetes include: diabetes education, medical nutrition therapy, exercise therapy, medication, and blood glucose monitoring. (2) Tuberculosis: mostly drug therapy, commonly used drugs are isoniazid, rifampicin, pyrazinamide, ethambutol and other treatments, the principle of tuberculosis drug therapy for early, regular, full, appropriate amount, joint. It can be seen, eat not fat generally need comprehensive management, need to pay attention to if once the other symptoms of discomfort, should consult a doctor in a timely manner, clear reasons, and under the guidance of the doctor for treatment. The above medication is in accordance with medical advice.