White, thick and greasy tongue coating in traditional Chinese medicine is mostly due to internal stagnation of dampness and phlegm, or stagnation of food (indigestion of food and its accumulation in the stomach), so the diet should avoid indigestible, greasy and spicy food. White and greasy tongue coating is mostly due to internal stagnation of dampness and phlegm, or stagnation of food and drink, while greasy and sweet foods can produce dampness and phlegm; spicy and stimulating foods, as well as fried foods, can easily produce heat; cold and cold can easily damage the spleen and stomach and aggravate phlegm and dampness; and inappropriate foods such as meat and other foods that should not be digested can easily aggravate the stagnation of food and drink. Therefore, we should try to avoid greasy, spicy, cold, cold, indigestible food and sweets. For people with white thick and greasy tongue, not only should they try to avoid the above foods in their diet, but also pay attention to develop good eating habits, such as trying to eat three meals at regular intervals, avoiding over-fullness and over-fatigue, overeating, and chewing and swallowing slowly during the process of eating.