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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.
Energy Balance. Key Fact 4: A variety of food is needed in the diet because different foods contain the different substances that are needed for health. These are nutrients, water and fibre. This section provides you with detailed teaching plans for Key Fact 4, including links to all the downloadable resources.nergy is provided by the nutrients carbohydrate, fat and protein. Other nutrients include vitamins and minerals. The amount of energy and nutrients provided by food depends on its size, known as a portion. Different nutrients have different functions in the body to keep us healthy.