Calories 29 k cal, Saturated Fat 0.018 g, Polyunsaturated Fat 0.043 g, Monounsaturated Fat 0.016 g, Cholesterol 0 mg, Sodium 2 mg, Potassium 101 mg, Dietary Fiber 1 g, Sugars 3 g, Protein 0.64 g, Vitamin A 0%, Vitamin C 8%, Calcium 1%, Iron 1%.
Red onions contain quercetin which is particularly well suited for scavenging free radicals. Aside from its antioxidant properties, quercetin has been found to possess cancer-fighting, anti-fungal, anti-bacterial, and anti-inflammatory properties. Red onions have also been shown to reduce the risk of stomach cancer. According to one study, half onion a day could reduce the risk of stomach cancer by 50%! The anti-inflammatory effects of red onion may be beneficial for people with allergies, asthma, and arthritis.