Onion

• Onions are low in calories but high in vitamins, minerals, and fiber. They're a good source of vitamin C, which is important for immune health and collagen production. They also contain folate, vitamin B6, potassium, and manganese.
• Onions contain sulfur compounds, which give them their sharp taste and smell. These compounds may help lower cholesterol levels and blood pressure, reducing the risk of heart disease and stroke.
• Onions are a good source of antioxidants, which help protect cells from damage caused by free radicals. This may help reduce the risk of chronic diseases such as cancer, heart disease, and Alzheimer's disease.
• Some studies have shown that onions may help reduce the risk of certain types of cancer, such as stomach and colorectal cancer. This is likely due to the presence of sulfur compounds and other antioxidants.