Most vegetables are important sources of minerals, vitamins, and cellulose. Certain vegetables, such as potatoes, contribute appreciable quantities of starch. Large amounts of the minerals calcium and iron are in vegetables, particularly beans, peas, and broccoli. Vegetables also help meet the body's need for sodium, chloride, cobalt, copper, magnesium, manganese, phosphorus, and potassium. Carotenes (the precursor of vitamin A) and ascorbic acid (vitamin C) are abundant in many vegetables. Vegetables are useful as sources of roughage.
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