Diet conditioning: The basic principle of diet health in winter should be "storing calories". Therefore, the foods to be eaten in winter are mutton, dog meat, goose, duck, radish, walnut, chestnut and sweet potato. At the same time, we must follow the principle of "eat less salty and suffer more": winter is the time when the kidney meridian is vigorous, while the kidney is salty and the heart is bitter. Eating too much salty will make the kidney water that is already high stronger, thus weakening the power of the heart yang. Therefore, we should eat more bitter food to help the heart yang.