It's that every nutrient affects the immune system. A balanced diet is probably the most important consideration in maintaining a healthy immune system. When the body is deprived of some minerals, it is more likely to retain pollutants. The immune system maintenance spotlight has recently turned to the functions of vitamins A, C and E in protecting the body's cells from damage caused by natural body processes, lifestyles, environment and chemical pollutants. Scientific research has also revealed zinc and selenium as essential minerals for the immune system.
Skin cells are impervious to many chemicals and are an effective barrier against bacteria.
However, without vitamin A, these cells would not be able to perform their protector function. Chemicals and bacteria would then be more able to penetrate the body. The body needs vitamin C to maintain normal levels of plasma during acute emotional or environmental stress. Plus, a rich source of vitamin C is necessary in the formation of white blood cells, which bear the brunt of the battle against bacteria and viruses. Vitamin E helps protect red blood cell membranes against oxygen damage.