During a cold, it is appropriate to eat some onions. If the onions are cooked, they are easier to digest. If consuming raw onions, eat them in moderation without overdoing it. Because they are spicy food, they have certain stimulating effects. Since onions are spicy, they can irritate the respiratory tract, leading to increased secretion of mucus, which in turn causes more nasal discharge and phlegm production. The expulsion of these secretions can help clear the respiratory pathways. Additionally, onions are rich in vitamins and can enhance the body's immunity.