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Grouping the Nutrients. Carbohydrates, proteins, and fats are called macronutrients, because they're large, and energy nutrients because they provide the fuel your body needs to do things. Vitamins and minerals are called micronutrients because they're much smaller in comparison.
This article reviews the essential nutrients, their sources, and their role in health and disease. The human body is composed of thousands of different chemicals. Amazingly, provided with enough calories, the body is capable of manufacturing nearly all of its needed nutrients. There are, however, some 45 or so nutrients that the human body is incapable of manufacturing. These nutritional elements are called essential because it is essential for humans to incorporate them into their diets.