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There are six major classes of nutrients found in food: carbohydrates, proteins, lipids (fats and oils), vitamins (both fat-soluble and water-soluble), minerals, and water. These six nutrients can be further categorized into three basic functional groups.
Macronutrients are nutrients that provide calories or energy. The prefix makro is from the Greek and means big or large, used because macronutrients are required in large amounts. There are three broad classes of macro-nutrients: proteins, carbohydrates, and fats.