A new issue of British Nature Immunology magazine reports that vitamin D is not only necessary for the growth and development of the body, but also plays an important role in immunity. It is an immune cell T cell that attacks foreign bodies "Commander".

Researchers at the University of Copenhagen in Denmark reported that T cells in the immune system have the function of recognizing and attacking foreign bodies such as bacteria and viruses, but it is not normally in a "battle state" and requires an "attack signal" to complete the inactive state. Transition to the active state. Vitamin D played the role of "commander" in this process. This study found that if there is no vitamin D, T cells will not take action even if they detect a foreign body, and remain inactive.

The researchers say this finding shows that the immune response can be controlled by regulating vitamin D levels in the body. For example, people with weakened immune functions can increase their resistance to disease by supplementing with vitamin D; and after surgery such as organ transplantation, they can reduce rejection by reducing the amount of vitamin D in the body.

Vitamin D exists in natural foods such as fish and eggs. Sun exposure also helps the body synthesize vitamin D. Vitamin D maintains the normal growth and development of bones and teeth by regulating the metabolism of calcium and phosphorus in the body.

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