Generally speaking, women are more afraid of the cold than men. Not long ago, two experts from an American institute of human health conducted a group experiment on female volunteers. The experimental report found that people with low cold tolerance have obviously insufficient iron content in their blood. The main cause of iron deficiency in women is menstruation, which leads to a large loss of iron. As we all know, iron is an important raw material for producing hemoglobin, which is the main functional substance in red blood cells and is responsible for the transportation and metabolism of oxygen in the body. Iodine and tyrosine are the main raw materials for making thyroxine. Iodine needs to be continuously ingested from food, while tyrosine is generally synthesized by itself in the body. Long-term iodine deficiency will affect the synthesis of thyroxine and reduce the body's ability to keep out the cold. How to warm hands and feet ● Soaking hands and feet locally with hot water before going to bed can not only promote the circulation of vascular endings, but also help sleep. ● After bathing or soaking in hot water, put on socks to keep warm immediately after drying. ● If women are often afraid of cold feet in winter, they can put hot water, rice wine and ginger slices in a bucket (the ratio of hot water to rice wine is 1: 1). Watching TV or getting off work in winter helps to improve women's fear of cold. Doing sports is not afraid of cold weather. When you eat too much and exercise too little, it is easy to accumulate excess fat in your body. At this time, you can do more exercise, which can not only consume too much fat, but also strengthen blood circulation and warm your body. What to eat is not afraid of cold. Choosing warm food or medicinal materials for tonic in winter can make the body's blood circulation smooth and qi and blood active, which can achieve the effect of keeping out the cold. Foods with warming function are generally red and sweet foods, or spicy condiments and foods. These foods have the functions of warming, nourishing and promoting metabolism. Warm food meat suitable for winter: mutton, beef, shrimp, sea cucumber, oyster, eel, venison, chicken liver, etc. Rich in lipids, protein and other meats. Fruits and vegetables: leek, perilla, green pepper, mustard, cabbage, pepper, onion, pumpkin, litchi, peach, longan, onion, ginger, garlic, etc. Others: brown rice, sorghum, sesame, nuts, cashews, walnuts, chestnuts and other drupe foods. When cooking or eating cold food, you can add some spicy spices such as onion, ginger, garlic, pepper, pepper, ginseng, astragalus, dried tangerine peel or Chinese herbal medicine to blend. For example, if you eat cold crabs, you can fry crabs with hot ginger to reduce the coldness of crabs. Common cold foods are loofah, wax gourd, celery, cucumber, kelp, frozen watercress, cabbage and so on. When cooking, you can use appropriate seasonings such as onion, ginger and garlic to achieve the effect of neutralizing the cold. In addition, you can also use Lycium barbarum, red dates, ginseng, longan pulp or ginger to make tea, which can also play a role in keeping out the cold.