nutrient is a topic covered in the Taber's Medical Dictionary.

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(noo′trē-ĕnt )

[L. nutrient-, feeding, suckling, nourishing]

1. Providing nourishment. Any substance that nourishes the body. Essential nutrients are those that the body either cannot synthesize or cannot synthesize in amounts sufficient to meet needs. Nutrients can be subdivided into the macronutrients (protein, carbohydrate, and fat), the micronutrients (including vitamins and minerals), and water.

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