Nutritionists study how foods influence the human body using concepts from molecular biology, biochemistry, and genetics. Nutrition also examines how people may utilize dietary choices to lower their disease prevalence, the functions that occur if they consume nutrients in certain amounts and the mechanism behind allergies.

Nutrients nourish the body. Nutrients include proteins, carbs, fat, vitamins, minerals, fibre, and water. People are more likely to acquire various health disorders if their diet lacks the proper nutritional balance. People require trace levels of several vitamins. Antioxidants like vitamin C  protect the t cells from injury by eliminating hazardous substances from the body known as free radicals.

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