Vitamin A is an important part of the immune system. It is required in the development of both helper T cells (help suppress or regulate immune responses, including helping B cells to secrete antibodies) and B cells (make antibodies, presents antigens to T cells that kills foreign substances such as bacteria, viruses, fungi, and parasites, and memorizes the antigen after its activation by an antigen). Vitamin A is essential for our vision.
Vitamin A sources include lean meats (particularly liver), dairy foods, green and yellow vegetables, and fruits with beta carotene (red-orange pigment found in vegetables and fruits), which converts to Vitamin A in the body.
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