You can’t eat pineapple, bananas, persimmons, hawthorn and other fruits on an empty stomach, as follows: 1. Although pineapple can promote the secretion of digestive juices, try to eat it after meals. In the state of fasting eat pineapple, pineapple enzymes in the pineapple will cause stimulation of the mucosa of the stomach wall, leading to spasm contraction of the stomach wall, and even cause nausea, vomiting; 2, bananas have laxative effect, but in the state of fasting eat, bananas in potassium ions and magnesium ions will be absorbed by the body in large quantities, the body of calcium, sodium imbalance. And bananas will be quickly discharged into the intestines, causing irritation to the mucous membrane of the intestinal wall causing diarrhea; 3, persimmons are high in tannic acid and pectin content, eaten on an empty stomach, tannic acid will be combined with stomach acid to produce gastric persimmon stones. Persimmon stone is not only difficult to digest and empty, but also irritates the mucous membrane of the stomach wall, causing gastric distension and stomach pain. 4. Although hawthorn has the function of strengthening the spleen and stomach and eliminating food, but when eaten on an empty stomach, the organic acids in hawthorn will cause irritation to the stomach wall, even causing stomach pain and stomach cramps.