You can add another meal in the evening, that is, eat midnight snack. If you persist in this way, you will gradually improve your thin physique. Eat three meals on time every day, and the law of life must be normal. I think you need a slowly recuperating body. Unilateral weight gain is not enough. I think you can start with the usual bits and pieces. After three meals, you can always prepare some desserts for yourself, or have a midnight snack at an appropriate night. These are good helpers to assist your weight gain plan, which can not only improve your gastrointestinal activity, but also adapt your body to the process of eating less and eating more meals. Why not? I used to have a brother-in-law who went to the hospital because he smoked for a long time and had a bad appetite. The doctor said it would be better to suggest Chinese medicine for conditioning. Later, I happened to find that Taobao Chinese medicine was satisfied, and a well-known old Chinese medicine practitioner had a fever. He told his brother-in-law the beauty of conditioning and fattening.