Only those who are allergic to dairy products should not eat yogurt, in addition to gastric ulcer patients, diabetics and other people need to properly control the intake. 1. Dairy allergy: dairy allergy should not drink yogurt, so as not to cause an allergic reaction, rash, itching, edema, breathing difficulties and other symptoms. 2. Gastric ulcer patients: yogurt contains more lactic acid, lactic acid will stimulate the secretion of gastric acid, so gastric ulcer patients should not drink a lot of yogurt, is not conducive to the alleviation of the condition. 3. Diabetic patients: yogurt may be added sugar or fructose syrup and other sugars, diabetic patients should avoid drinking a lot of yogurt or choose not to contain sugar.