The cause of diarrhea in the elderly eating fruit may be caused by weak gastrointestinal function or spleen and stomach cold (spleen and stomach weak cold). 1. Weak gastrointestinal function: for example, chronic enteritis and patients with irritable bowel syndrome are often more likely to lead to the rejection of any cold and raw food, such as hot pot, barbecue, instant noodles, and some raw and cold, spicy and greasy food, which will cause diarrhea once used. 2. Cold spleen and stomach: it will cause diarrhea after eating fruits. This is because most of the fruits are often cool, such as persimmons, watermelon and pears, etc., once a large number of patients with cold spleen and stomach to eat, it will cause diarrhea symptoms. It is recommended that patients need to go to a regular hospital to receive relevant examinations, after diagnosing the cause of the disease, under the guidance of specialists and active treatment.