Though all vegetables are important for health, certain kinds offer unique benefits.
Onions 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 (1Trusted Source).
Here are some impressive health benefits of onions.
1. Packed With Nutrients
Onions are nutrient-dense, meaning they’re low in calories but high in vitamins and minerals.
One medium onion has just 44 calories but delivers a considerable dose of vitamins, minerals and fiber.
This vegetable is particularly high in vitamin C, a nutrient involved in regulating immune health, collagen production, tissue repair and iron absorption.
Vitamin C also acts as a powerful antioxidant in your body, protecting your cells against damage caused by unstable molecules called free radicals.
Onions are also rich in B vitamins, including folate (B9) and pyridoxine (B6) — which play key roles in metabolism, red blood cell production and nerve functions.
Lastly, they’re a good source of potassium, a mineral in which many people are lacking.
In fact, the average potassium intake of Americans is just over half the recommended daily value (DV) of 4,700 mg.
Normal cellular function, fluid balance, nerve transmission, kidney function and muscle contraction all require potassium.
Onions are low in calories yet high in nutrients, including vitamin C, B vitamins and potassium.
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