With the scorching sun beating down on us, it necessary to keep our body cool. Onions help to beat the heat and prevent heat strokes. The good part is that onions, especially red ones, contain a chemical called quercetin which is said to have an anti-histamine effect. Histamine causes heat rashes and adverse reactions to insect bites and stings, so eating onions daily may help. This is not all, the juice can cure burnt skin. The bad cholesterol that causes heart problems can also be taken care of if onion is consumed every day.