Onion is a food with low energy content. In the composition of the onions, its mineral and vitamin content must be taken into account. Onions are a source of mineral potassium that contributes to the normal functioning of muscles and the nervous system. Onions in general and sweet onions are rich in flavonoids and sulfur compounds (alkyl cysteine sulfoxide), responsible for their aroma. Among the flavonoids, the anthocyanins are responsible for the pink or purplish color of certain varieties of onion; but above all, the quercetin content stands out with an important antioxidant function. Vitamin C contributes to the protection of cells against oxidative damage.
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