You may be familiar with vitamin D, which is one of the essential 13 vitamins. In recent years, perhaps because of the improvement of our living standards, most people take it for granted that there is no shortage of vitamin D in our bodies, but around the world, the survey data actually found that more than half of the people in the world lack vitamin D! Most people's understanding of vitamin D begins with bones, but they don't know that vitamin D can not only promote calcium absorption and bone growth, but also play an important role in immune regulation. Some medical studies have found that vitamin D can actually help people lose weight! Today, we will reveal the superiority of vitamin D 0 1 improve immunity. According to the British journal Nature Immunology, vitamin D plays an important role in immunity and is the "commander" of immune cells T cells attacking foreign bodies. When the human body lacks vitamin D, the immune balance will be destroyed, and the risk of diseases such as respiratory tract infection will increase. According to a new study published by medRxiv, a medical preprint platform, patients with severe COVID-19 are generally deficient in vitamin D. The latest epidemiological study on preventing diabetes shows that the higher the level of vitamin D in blood, the lower the risk of diabetes, because vitamin D can stimulate the body to produce more insulin. Protecting blood vessels and taking enough vitamin D can reduce the risk of premature death of cardiovascular patients by 30%. The reason is that vitamin D can regulate blood pressure, improve heart function and reduce the risk of heart disease and stroke. Helping to lose weight and supplementing vitamin D can improve the body mass index and blood lipid status of overweight/obese people. Promoting the absorption of calcium Vitamin D can enhance the absorption of calcium in the intestine, promote the application of calcium and phosphorus in the body, ensure sufficient calcium and phosphorus in the body, and ensure the continuous regeneration of bone tissue. Vitamin D is also used to ensure the normal function of thyroid and pituitary in the body. The maximum tolerable intake of vitamin D in China is 20μg g. Excessive intake will cause vitamin D poisoning. Vitamin D poisoning can be manifested as anorexia, constipation, vomiting, headache, polydipsia, decreased muscle tone, increased and abnormal heart rate, and even soft tissue softening. Especially infants are most prone to vitamin D poisoning. People can supplement vitamin D by eating more fish oil, eggs, fruits and vegetables. More sun exposure can also help people synthesize vitamin D, but not too much sun exposure.