Yogurt and milk can usually be eaten together. Because yogurt is fermented from milk, both are dairy products that do not produce toxic substances when mixed, so they can be eaten together. The lactic acid bacteria in yogurt helps digestion, balances the intestinal flora and promotes intestinal peristalsis, while lactose is consumed to a large extent during the fermentation process of yogurt, making it the best choice for lactose intolerant patients. However, mixing milk and yogurt together for lactose intolerant patients may still lead to lactose allergy, bloating, diarrhea, nausea, vomiting and other symptoms. Milk and yogurt are both good for replenishing calcium and protein for the body, but those who are allergic to dairy products should not consume milk and yogurt. Diabetics are advised to consume unsweetened yogurt, and patients with hyperlipidemia and other conditions can choose low-fat or skim milk.