Apples boiled in water can not treat diarrhea, but cooked apples can help treat diarrhea for the following reasons: 1. Apples contain a large amount of tannins, which can play a role in protecting the mucosa of the gastrointestinal tract and can play an effective protective role against damage to the intestinal mucosa caused by bacterial enteritis. 2. It contains a large amount of fructose and pectin, both of which have the function of promoting intestinal peristalsis, lubricating the intestines and laxative, which can aggravate diarrhea after eating, but after steaming apples, the fructose and pectin are broken down, thus not aggravating diarrhea. There is no diarrhea treatment in the water of boiled apples, so it is not possible to treat diarrhea. Diarrhea cannot be treated by eating boiled apples alone, but needs to be treated with medication.