It is not true that eating yogurt and dragon fruit together can cause diarrhea, but it may be due to other reasons such as expiration of the yogurt in the case of diarrhea after eating. Yogurt is a common sour dairy drinks, generally need to go through the national food quality inspection before listing, itself is edible and non-toxic. Dragon fruit is a common fruit, rich in vitamins, water-soluble dietary fiber, plant albumin and anthocyanins, etc., the two eaten together generally does not cause diarrhea. After eating yogurt and dragon fruit, diarrhea may occur as a result of acute gastroenteritis, etc. due to expiration of the yogurt, but this is not due to the nature of the two foods themselves. Therefore, the claim that eating yogurt and dragon fruit together will cause diarrhea lacks scientific basis and has no clear evidence-based medical evidence. Diarrhea is recommended to consult a doctor to avoid dehydration and electrolyte metabolism disorders, and follow the doctor’s instructions for treatment.