What is the relationship between nutrition and health?

The word nutrition comes from a Latin root nutr-, which means to nurture or nourish. Nourishment is that which sustains life. Therefore, the science of human nutrition focuses on nourishing human life. From the moment of conception until death the body needs energy and nutrients to carry out vital functions such as breathing, digestion, metabolism, and every other physiological process in the body. Nutrition is thus the study of food; its nutritional components; the nutrient requirements of humans; and the means by which humans can maintain health and prevent disease through optimal nourishment from a healthy diet.

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