Onions (Allium cepa) are members of the Allium genus of flowering plants that also includes garlic, shallots, leeks and chives.
These vegetables contain various vitamins, minerals and potent plant compounds that have been shown to promote health in many ways.
In fact, the medicinal properties of onions have been recognized since ancient times, when they were used to treat ailments like headaches, heart disease and mouth sores.
Onions are nutrient-dense, meaning they’re low in calories but high in vitamins and minerals.
Onions contain antioxidants and compounds that fight inflammation, decrease triglycerides and reduce cholesterol levels — all of which may lower heart disease risk.