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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.
Your body requires six essential nutrients: fat, proteins, carbohydrates, vitamins, minerals and water; however, it can't produce these nutrients independently, so you have to consume them through your diet. Nutrient Classifications. The macronutrients -- fats, proteins and carbs -- provide the majority of our energy. Vitamins and minerals, which include iron and calcium, are considered micronutrients because we require them in much smaller quantities. A varied diet is the best way to get all essential nutrients.