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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.
Vitamin B-12 is an essential nutrient that assists with several processes in your body. This water-soluble vitamin is found in seafood, meat, dairy products and fortified cereals. Vitamin B-12 helps your body form cells, keep your nervous system healthy and properly metabolize food.