Red onions are rich in nutrients such as vitamin C, dietary fiber, flavonoids, and polyphenolic compounds. Among them, anthocyanins and other antioxidant substances have a high content, which helps neutralize free radicals and delay aging; Sulfides can lower cholesterol levels, promote blood circulation, and improve cardiovascular health; Cellulose can promote intestinal peristalsis, maintain intestinal microbiota balance, and help prevent constipation.