The main classes of essential nutrients are carbohydrates, fats, proteins, water, vitamins and minerals (the last two often in small amounts). Another good way to think of it is by looking at the revamped food pyramid from the US Department of Agriculture, pictured under the second link below. They stress that you should have plenty of fruits, vegetables, and grain, some meat and dairy, and small amounts of oils. Basically, any long-term healthy diet should include a balanced variety of foods.
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