Onion juice can cure burnt skin or an insect bite or a bee bite. It may burn more but it can heal it very effectively. The benefits of onion in this overall dietary context extend to prevention of heart attack. In virtually all of these diet based studies, participants with the greatest intake of vegetables (including onions) gain the most protection. The outstanding flavonoid content of onions supports these research findings. Its also interesting to note that onion is most commonly consumed in relatively small amounts along with other foods rather than by itself.