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Dr. Anila Chandy is a senior physician based in Chennai , India, and she states that these essential nutrients, if deficient, can cause recurrent and prolonged infections. Apart from commonly known diseases like diabetes that weaken the immune system, these deficiencies seem to affect a large segment of society and is hardly dealt with.
The first nutrient is Iron, deficiency of which causes not only anemia but also a weak immune system.
The second is Vitamin B12 which is usually deficient in vegan diets and so supplemets need to be taken.
The third is folic acid; the fourth is Zinc and the fifth is Vitamin C.
She also lays emphasis on adequate water consumption for a healthy immune system.

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