Some people have diarrhea when they drink too much yogurt for the following reasons: 1. Most yogurt is kept refrigerated, so if you drink yogurt taken directly from the refrigerator, the gastrointestinal tract will get cold and cause diarrhea. 2. yogurt contains lactobacillus, and intestinal intolerance to lactobacillus will cause diarrhea. 3. 4. Yogurt contains lactose, which requires lactase for digestion and absorption, and if lactase is not secreted enough, diarrhea will also occur. Therefore, if you are prone to diarrhea, you should not drink too much yogurt. It is recommended to drink a small amount of warm yogurt, and you can take lactobacillus tablets to regulate intestinal flora imbalance when you have diarrhea.