Onions contain quercetin, a nutrient that breaks up mucus in your head and chest while boosting your immune system. Onions increases your blood circulation and makes you sweat, which is helpful during cold weather to help prevent infections. Consuming raw onion within a few hours of the first symptoms of a cold or flu produces a strong immune effect, also chopping it into your favorite soup or recipe is a way to enjoying them. Placing half an onion in your bedroom while you sleep can help absorb some of the circulating bacteria.
