After beginning of winter, heating began in the north, and the dry indoor air made people "get angry". At this time, you can eat more white food, which can best prevent dryness and heat. When cooking, you can choose white radish, cabbage, wax gourd, lily, lotus root and so on. Among them, cabbage and radish are the most effective and economical supplements, but people with cold stomachs should eat less in winter. We should also cultivate the habit of going to bed early and getting up late. Going to bed early can preserve the yang, keep your body warm, and get up late to supplement the yang. Yang is the guardian of human body, distributed on the skin surface, responsible for resisting all external evils and maintaining human safety. Only in this way can we achieve the effect of health preservation in winter.