It is best not to eat purple potatoes when you have diarrhea. Diarrhea when the gastrointestinal peristalsis is hyper, this time because there is inflammation stimulation, intestinal hyperperistalsis can not be normal absorption of food, it is recommended that during the period of diarrhea to the well-digested fluids or semi-liquid diet, such as gastric congee, millet porridge, rotten noodles, etc., do not eat spicy, stimulating, and cold, greasy food. Purple potatoes are more gas-producing and difficult to digest food, so eating purple potatoes during diarrhea may aggravate the burden on the gastrointestinal tract, resulting in intestinal non-absorption, diarrhea is more serious. When diarrhea is serious, in addition to pay attention to diet, you can take appropriate oral antidiarrheal drugs, such as montelukast.