Too thin is due to lack of nutrition.
There are three reasons for malnutrition:
1, eat too little.
2. There is a disease. If there are parasitic diseases such as ascaris lumbricoides, it consumes a lot of nutrients, and the absorption and utilization rate of nutrients in gastrointestinal tract is low.
3. Excessive exercise. If you are too old, you are too tired.
Treatment measures
1, increase the amount of meals and the number of meals. If conditions permit, it is recommended to eat four meals a day, and eat as balanced nutrients as possible.
2. Take insect repellent and stomach medicine under the guidance of a doctor.
3. Try to reduce the amount of exercise and get more rest.