Eating not absorbed, very thin body, may be genetic factors, lactose intolerance, intestinal parasitic infection, peptic ulcer and other reasons, according to its cause, give general treatment, drug treatment. 1. Hereditary factors: some people are affected by heredity, which can lead to non-absorption of food and thin body shape, usually appropriate exercise to enhance physical fitness. 2. Lactose intolerance: some people lack lactase enzyme in their body, which can not break down lactose, leading to diarrhea and body thinning, probiotics can be given, such as Saccharomyces boulardii, and lactase preparations for comprehensive management, to promote digestion and absorption. 3. Intestinal parasite infection: intestinal infection with parasites, affecting the digestion and absorption of food, body wasting, diarrhea and other symptoms, can be given to albendazole and other drugs deworming treatment. 4. peptic ulcer: gastric mucous membrane damage affects the digestion and absorption of food, resulting in body wasting, can be given omeprazole, pantoprazole, magnesium aluminum carbonate chewable tablets and other drugs. Eat does not absorb very thin, there are other reasons, it is recommended to seek medical advice, identify the causes, follow the doctor’s instructions for treatment. The above medication is in accordance with medical advice.