Lactose intolerance is caused by a deficiency of lactase, which can lead to diarrhea when consuming dairy products. Thus, patients with this condition should avoid consuming milk powder, cow's milk, goat's milk, etc. If they must consume dairy, they should choose products that have been specially processed. Patients with lactose intolerance can drink rice soup, thin porridge, millet congee, and similar foods. It is also important for these patients to maintain dietary hygiene, avoid overeating, and avoid binge eating. Eating small, frequent meals to ensure a steady supply of nutrients is recommended.