10 Health Benefits of Onions

Onions are a kitchen staple that are used in many dishes, and there’s a good reason for that. If you’ve cooked recipes from your mom, grandma, Pinterest (or anywhere else), you may have noticed that savory recipes call for onions more often than not.

Whether they are raw, chopped, sautéed, or softened, onions are an extremely versatile ingredient, bringing not only delicious flavor but also some incredible health-related benefits!

From heart health to disease prevention, here’s why adding more onions to your meals might be one of the tastiest ways to boost your wellness.

In this article:

Onions Have Many Antioxidants

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Antioxidants may help prevent cell damage by fighting free radical molecules. Free radicals are developed when the body is exposed to radiation or tobacco smoke. These molecules can cause diabetes, heart disease, and cancer. By eating onions, you can help your body fight free radicals and improve your overall health.

Key benefits:

  • Onions contain quercetin, a powerful antioxidant with antiviral and anti-inflammatory properties
  • Help protect cells from oxidative stress
  • May reduce risk of chronic conditions like heart disease and cancer
  • Support immune system regulation

Helps Regulate Blood Sugar Levels

An old woman with white hair, glasses, and a green polka-dot shirt is sitting on a couch and smiling. She has a continuous glucose monitor on her arm and she is using her phone to check her blood levels.

If you have diabetes, onions are an excellent way to help keep your blood sugar levels steady. The flavonoids in onions work to keep blood glucose levels stabilized. If levels are low, you might experience symptoms such as fatigue, anxiety, headaches, and many other signs.

Key benefits:

  • Flavonoids in onions help stabilize glucose levels
  • May improve insulin sensitivity
  • Prevent energy crashes and spikes throughout the day
  • Support better metabolic control

Improved Digestive Health

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Onions contain a high amount of prebiotics and fiber. These compounds help improve gut health by aiding in digestion in the body, strengthening the immune system, and lowering inflammation. Onions are rich in fructans, a type of prebiotic fiber that serves as fuel for beneficial bacteria in the gut, leading to optimal digestive function.

Key benefits:

  • High in prebiotics like fructans, which feed beneficial gut bacteria
  • Rich in fiber to promote regular bowel movements
  • Reduce risk of constipation and gastrointestinal issues
  • May support immunity through better gut health

Onions are Loaded with Nutrients

Side view of a kitchen counter as someone is preparing to make a meal. Hands are cutting some onion on a wooden cutting board. Surrounding the cutting board are other ingredients such as: chili peppers, meat, eggs, spices, other vegetables, and oil.

Onions are considered to be a nutrient-dense food. This means that they contain a small number of calories and many nutrients. They are a great source of potassium and manganese. Potassium helps to increase energy and your metabolism.

It’s also known for its role in maintaining the balance of fluids in and out of cells, which is essential for proper cell function and overall hydration.

Key benefits:

  • Great source of potassium, which aids muscle function and hydration
  • Contains manganese to support connective tissue and bone health
  • Help regulate metabolism and energy production
  • Contribute to maintaining fluid balance in the body

Anti-Inflammatory Properties

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As mentioned before, onions contain an important antioxidant called quercetin. Quercetin is also an anti-inflammatory that works to fight off inflammation within the body.

Its benefits extend to aiding conditions like arthritis, helping to alleviate joint pain and stiffness by inhibiting inflammatory molecules.

Key benefits:

  • Quercetin works as a natural anti-inflammatory agent
  • May ease symptoms of arthritis by reducing joint stiffness and pain
  • Potential to support urinary health by reducing inflammation
  • Aids in fighting systemic inflammatory conditions

May Help With Cancer

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If you are concerned about your risk of developing cancer, you may want to consume more onions. The sulfur compounds, flavonoids, and antioxidants found in onions contribute to their anti-cancer properties.

Researchers found moderate consumption of onions appeared to reduce the risk of colorectal, laryngeal, and ovarian cancers.

Key benefits:

  • Contain organosulfur compounds linked to anti-cancer effects
  • Associated with reduced risk of colorectal, ovarian, and laryngeal cancers
  • Rich in antioxidants that help protect DNA from damage
  • Support detoxification processes in the body

Reduces Risks of Alzheimer’s Disease

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Studies have been conducted to discover the relationship between quercetin and Alzheimer’s disease. These studies showed a significant association between consuming foods high in quercetin, such as onions, and having a lower chance of developing Alzheimer’s.

Key benefits:

  • Quercetin may help protect brain cells from oxidative damage
  • Linked to a lower risk of neurodegenerative diseases
  • Supports long-term memory and cognitive function
  • Easy dietary addition to support brain longevity

Great Source of Vitamin C

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Did you know that onions contain a high amount of vitamin C? Vitamin C is a crucial component for maintaining optimal bodily functions, and onions are a fantastic source of this vital vitamin.

Vitamin C helps the formation of blood vessels, improves your immune system, and builds cartilage.

Key benefits:

  • Aids in collagen production for skin and joints
  • Supports a healthy immune response
  • Assists with iron absorption and overall cell repair
  • Helps the body fight off colds, flu, and infections

Supports Bone Health

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Studies have proven that onions improve bone density in some people. As a result, the consumption of onions may help strengthen the bones and reduce the risk of fractures for people over the age of 50.

Key benefits:

  • May increase bone mineral density, especially in women over 50
  • Manganese content supports bone tissue and joint health
  • Could reduce risk of fractures and osteoporosis
  • Adds strength and resilience to your skeletal system

Antibacterial Properties

Two hands are out spread as if holding something. Above the hands is a simple, blue vector image of a colon. It is similar to an x-ray.

The antibacterial properties of allicin in onions help the colon fight off harmful bacteria. Allicin is the compound that gives off the unique, pungently strong smell of an onion. You can think of allicin as your fighter against toxins and illnesses.

Key benefits:

  • Rich in allicin, which has antibacterial and antifungal effects
  • May help protect the colon and digestive tract from harmful microbes
  • Supports overall gut balance and detoxification
  • Natural way to reinforce the body’s defenses

Onion Nutritional Facts

Now that you understand the delicious health benefits of onion, let’s dig into onion nutrition and see how each onion’s nutrition facts differ. Common onion varieties are red, white, and yellow, with each type of onion containing mostly water, carbohydrates, and fiber. Onions are also a great source of important vitamins like iron, calcium, and vitamin B6!

Here are some nutritional value estimates you can expect from a regular-sized onion (about 110g), according to the USDA:

White Onion Nutrition Facts

Calories43
Total Fat0 g
Fiber1.2 g
Protein1.2 g
Total Carbohydrates9.4 g
Total Sugar5.7 g

Yellow Onion Nutrition Facts

Calories44
Total Fat0 g
Fiber3 g
Protein1.2 g
Total Carbohydrates11 g
Total Sugar5.7 g

 

Red Onion Nutrition Facts

Calories44
Total Fat0 g
Fiber2 g
Protein1 g
Total Carbohydrates11 g
Total Sugar9 g

How to Incorporate Onion into Your Diet

After reading about the ten health benefits that onions provide, you may be wondering how you can add more onions to your daily diet. A simple and quick way to start consuming more onions is using Spice World Easy Onion!

You no longer need to deal with the hassle of peeling and chopping onions as your eyes well up with tears. All you need to do is squeeze the bottle or scoop from the jar for chopped onions in an instant. It doesn’t get easier than that!

Frequently Asked Questions (FAQs)

Are raw onions healthier than cooked onions?

Raw onions do retain more sulfur compounds and antioxidants before cooking, making them slightly more beneficial than cooked ones. However, both have useful health benefits.

While there’s no exact recommended amount, consuming ½ to 1 onion per day may help you maximize its antioxidant and anti-inflammatory benefits.
Yes, onions are low in calories and high in fiber, which can aid digestion and help you feel full longer.
Yes, onions have antimicrobial and immune-boosting properties that may help combat bacteria and viruses.
Red and yellow onions tend to have higher antioxidant levels compared to white onions, making them slightly healthier.

Final Thoughts

From inflammation to immunity, onions are a powerful tool for better health. They’re easy to incorporate into everyday meals and offer a flavorful way to nourish your body from the inside out. 

Don’t underestimate the health punch packed into this everyday vegetable—your body and taste buds will both benefit.