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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. Macronutrients are nutrients that your body requires in large amounts, and they make up the bulk of your diet. The three types of macronutrients are carbohydrates, fats and proteins. Carbohydrates -- sugars and starches -- break down into glucose, a simple sugar that your cells use as a source of energy.