Nourishing the liver should not be sour, greasy or alcoholic in season. Spring is the season of vigorous liver fire, and the focus of spring health preservation is to keep the liver healthy. When the liver fire is strong, it is easy to be weak in the spleen and stomach. Chinese medicine believes that "beginning of spring has been sour and sweet for 72 days to nourish his temper." In other words, eat less acid in spring to increase sweetness. Eating too much acidic food will make the liver fire more prosperous, while sweet food can effectively regulate the liver fire. If you eat more yam, chrysanthemum, Malantou, leek, chicken liver and so on. It can play its due role in clearing the liver. However, it is not advisable to eat too much greasy food such as meat in spring. Alcohol is the number one enemy of the liver. Excessive drinking can also lead to fat accumulation in the liver, causing fatty liver. It is suggested that nourishing the liver in spring should avoid acid, greasy and alcohol. It is also worth reminding that fresh fruits in spring must wait until they are ripe and sweet. Unfamiliar fruit is too sour, and eating too much is easy to hurt the liver. In addition, fatty foods such as mutton, marine fish and shrimp should be avoided in spring, and attention should be paid to the intake of vitamins, inorganic salts and high-quality protein. Medical research also shows that the lack of adequate vitamin B can easily lead to sleepiness in spring, and vitamins can also enhance human immunity.