What are deficiency diseases

an disease caused by the lack of some essential or important element in the diet, usually a particular vitamin or mineral.

deficiency diseases are those diseases that  are cause because of lack of element in diet, usually an particular vitamins or the minerals.

Explanation:

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the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.