Categories: Vegetables

22 Benefits of onions and side effects

Published by

Discover the 22 shocking health benefits of onions and side effects.

Whether it’s raw onions or cooked onions, both are loaded with benefits and you can eat them whenever you want – day or night.

Vegetables are an excellent source of vitamins C and B6, folate, iron and potassium, but particularly onions are also rich in manganese that offers protection against colds and flu.

For example, allium and allyl disulfide, are two phytochemicals present in onions, which become allicin after ingestion.

Allicin, according to certain studies, has properties to fight cancer and diabetes, therefore, it is mentioned as one of the great health benefits of eating onions.

But not only that they offer you the health benefits of eating onions, it can also reduce the stiffness of blood vessels and lower blood pressure levels.


Even certain types of onions like chives, leeks, and shallots have similar benefits.

Onions also contain quercetin, another antioxidant that fights inflammation.

More interesting, cooking onions in the soup does not lower their quercetin value, but simply transfers the antioxidant from the vegetable into the soup broth.

And not only the vegetable, even the essential oil of onions has benefits.

The oil has antiseptic and antibacterial properties.

And although onions cannot induce weight loss directly, substituting high-calorie foods can make some contribution.


Wait, there is more, the health benefits of eating onions are many, and in this publication we will list the most important ones so that you know them and add this delicious vegetable to your diet.

22 shocking health benefits of eating onions


22 health benefits of eating onions

As we have been telling you, the health benefits of eating onions are innumerable due to its high caloric and nutritional value.

So pay attention to the following guide so that you know how you should consume it and with what intention.

1 | Benefits of onions for cancer.

According to a study conducted by the University of Guelph, red onions are the most effective in destroying breast and colon cancer cells .

These onions have high levels of quercetin and anthocyanin – two compounds that contribute to this characteristic.


Onions activate the pathways that cause cancer cells to commit suicide and make the environment unfavorable for cancer cells to communicate, inhibiting their growth.

People with the highest consumption of onions were also found to have the lowest cancer rates .

As a preventive measure, you can have your hamburgers garnished with red onions.

2 | Improves heart health.

The flavonoids in red onions can contribute to heart health.

Among the health benefits of eating onions, it is noted that they are also rich in organosulfides, which can help prevent heart disease .

According to an Argentine study, the intake of organosulfur compounds found in onions can reduce the risk of cardiovascular disease.


Onions contain thiosulfinates that act as natural blood thinners and reduce the risk of heart attack and stroke.

Quercetin in onions also has the potential to fight heart disease.

Offers antioxidant and anti-inflammatory properties that promote organ health; they can also improve cholesterol levels, and this ultimately benefits the heart.

According to a report from the Cambridge University Press, flavonoids in onions help lower LDL (bad cholesterol) levels in obese people.

3 | Benefits of onions for diabetes

A study has shown that onion extract can help lower blood sugar levels.

The study was conducted in diabetic rats, and the results were encouraging.


One of the sulfur compounds in onions (S-methylcysteine) and quercetin may have beneficial effects on blood sugar.

However, it was found that the onions exhibited the positive effect only when taken together with metformin, the antidiabetic drug.

In yet another study, polyphenols (especially those from onion) were found to play a role in glycemic control .

4 | Benefits of onions for digestion

The benefits of eating onions, especially the digestive ones, can be attributed to inulin , a fiber present in the vegetable.

Inulin acts as a food source for beneficial bacteria in the intestines.

Consuming this fiber helps your body maintain good levels of healthy bacteria, however, the thiosulfinates in onions can cause harm to these beneficial bacteria (as they have antibacterial properties).


Therefore, if you are sensitive to the antibacterial properties of onions, consult your doctor.

Another soluble fiber in onions, oligofructose (which is a subgroup of inulin), was found to prevent and treat different types of diarrhea, while the phytochemicals in onions can reduce the risk of gastric ulcers.

The natural prebiotics in onions can also help relieve constipation ; They are even believed to help treat stomach pain and stomach worms, although more research is required.

5 | Maintains bone health.

Following the wave of the benefits of eating onion, we can tell you that preliminary research suggests that onions can prevent age-related osteoporosis.

According to Swiss researchers, a compound in white onion (called GPCS) can reduce bone loss; Although the study was carried out in rats, it has promise for humans.

Another study revealed that women who ate onions regularly had 5 percent more bone mass than those who ate less, consuming onion was also found to have a beneficial effect on bone density in women over 50.


According to the Arthritis Foundation, quercetin in onions can inhibit the activity of leukotrienes, prostaglandins, and histamines (all of which cause inflammation) in osteoarthritis and rheumatoid arthritis, the intake of onion was also found to help treat pain in the joints.

6 | Prevents inflammation and other allergies.

We have already seen quercetin (and other flavonoids) in onions can help prevent inflammation.

That is why within the benefits of eating onion, we also have to treat allergies by preventing the cells from releasing histamine.

Cooking with onions can help open and drain your sinuses.

And quercetin’s antihistamine properties can also help reduce nasal congestion, even eating a raw onion in the evening can help relieve congestion – the sulfur compounds in onion can break down the mucosa.

Onions also have antibacterial properties.


According to a study, onion extracts acted against Streptococcus mutans and Streptococcus sobrinus, the bacteria responsible for tooth decay and other allergies, as well as onions also have antibiotic effects that can accelerate wound healing.

7 | Improves the immune system.

Onions contain selenium that stimulates immune function.

The mineral also prevents excessive immune response, which can have adverse effects, selenium-deficient immune cells develop and reproduce ineffectively, and this is where onions come into the picture.

Such cells also have difficulty making important proteins and transporting calcium.

Similarly, framing ourselves in the benefits of eating onions, we can clarify for you they are also considered medicinal herbs in Russia, where they are used to treat colds and flu

You can also make onion tea to treat colds.


This tea gives you an immunity boost and helps prevent ailments ; making the tea is as simple as slicing an onion, just boil it in water and drink the juice, this acts as a quick remedy for your cold and other illnesses, you can also add other ingredients like ginger for taste.

8 | Cure ear disorders.

According to one report, although research is limited, most parents swear by onions to cure ear ailments.

They insist that onion juice can work very well to relieve earaches, one way to do this is to heat the onion, extract some of the juice and pour a few drops into the infected ear.

And this remedy, we believe, dates back to the 19th century, so the benefits of eating onion are old.

All you need to do is place the onion in a 450o F oven, let it sit for 15 minutes or until it becomes soft.

You can stretch the juice once, and with a medicated dropper, pour a few drops of the juice into your infected ear .


An alternative is to place onion packets in the infected ear. Although the remedy is not scientifically proven, some people believe that it might work.

9 | Promotes Respiratory Health.

According to an American study, they mention among the great benefits of eating onion, the ability to improve health in patients with respiratory problems such as asthma and allergic rhinitis.

The anti-inflammatory properties of onions can also help soothe respiratory ailments , if you suffer from a respiratory illness, you can simply include onions in your diet (in addition to your medication) for faster relief.

10 | Benefits of onions for sleep

Onions contain prebiotics, which, according to a study, can improve sleep and even reduce stress.

When beneficial bacteria in the gut digest prebiotic fiber, multiply and improve gut health, and most importantly, release metabolic by-products, these by-products can influence brain function and induce sleep.


11 | Benefits of onions for eyes

The sulfur in onions improves the health of the eye lens.

It stimulates the production of a protein called glutathione, which acts as an antioxidant; higher glutathione levels mean a lower risk of glaucoma, macular degeneration, and cataracts.

The selenium in onions supports vitamin E in the eye (which protects the cells in the eye).

According to an Iranian study, onions can inhibit the growth of the normal flora of the eye, this highlights the possibility that onion is a potential cure for common eye infections such as conjunctivitis and blepharitis.

In the study, onion juice was used as eye drops – which led to benefits. You can also give it a try, but we recommend that you consult your healthcare provider first.

12 | They are good for oral health.

Onions contain thiosulfonates and thiosulfonates (the sulfur compounds) that help reduce bacteria that cause tooth decay.


And eating them raw is best – as cooking might destroy some of these beneficial compounds.

The vegetable is also rich in vitamin C which can keep teeth healthy.

Onions are also believed to be able to relieve tooth pain, however there is less research on this.

But one downside of onions is that they can cause bad breath.

Therefore, wash your mouth thoroughly after consuming onions – especially if you are heading to a social gathering.

13 | Helps in the treatment of cholera.

It was found that among the benefits of eating onions, it stands out that they had an inhibitory effect against V. cholera, the microbe responsible for cholera, this can be attributed to the antibacterial effects of the vegetable .


14 | Prevents blood clots.

Onions contain a compound called rutin, which can help prevent blood clotting .

In numerous studies with mice, rutin was found to be the most potent antithrombotic compound, clots occur in arteries and veins – in arteries, clots are rich in platelets, while in veins they are rich in fibrin.

The rutin in onions helps to block an enzyme (protein disulfide isomerase), which is released very quickly when blood clots form.

15 | Gives a boost of energy.

The fiber in onions slows down digestion and keeps energy levels stable.

The inulin present in the vegetable helps maintain their resistance levels, for this reason, many highlight this ability as one of the great benefits of eating onion.

16 | Benefits of onions sexually

Onions are one of the medicinal herbs used in western Uganda to control sexual impotence and erectile dysfunction , even in another way the vegetable is known to have benefits for men.


Drinking onion juice with honey is known to increase fertility in men. ‘

17 | Optimize brain health.

Research suggests that the antioxidants in onions bind with harmful toxins in the brain and expel them out of the body.

And the sulfur-containing compounds in onions can decrease age-related memory loss, meanwhile, onion extracts have been found to support the hippocampus.

However, some of these memory-fighting properties can be lost during cooking, so try eating the fruit raw.

Another sulfur compound in onions, called di-n-propyl trisulfide, improves memory impairment; Onions are also believed to treat dizziness, epilepsy, and vertigo, although we have limited research on this.

18 | Cure fever.

Onion can be included as a food ingredient to cure fever. It can also prevent or treat nosebleeds, given its natural moisture, which can help the blood clot (externally).


19 | Reduces oxidative stress.

According to a Chinese study, drinking onion juice can help modulate oxidative stress ; In another study, it was found that onions can also reduce oxidative stress induced by diabetes.

Quercetin in the vegetable can prevent diseases related to oxidative stress, it also protects DNA against damage caused by oxidative stress.

Another Argentine study attributes the ability of onions to reduce oxidative stress to their anti-inflammatory and antioxidant properties.

20 | Benefits of onions for skin.

Onions are packed with vitamins A, C, and E, all of which contribute to healthy skin.

They protect the skin from premature aging caused by free radicals and since the vegetable is a powerful antiseptic, it can also protect the skin from bacteria that cause problems.

And by the way, research says that vitamin C is important for imparting a glow to skin.


21 | Fight against the effects of aging.

Onions have enormous anti-aging benefits . The antioxidant vitamins A, C and E fight against the damage caused by harmful UV rays, as well as prevent the damage of free radicals that is responsible for causing premature aging of our skin.

Onion is one of the richest sources of quercetin, which is why great benefits of eating onion are attributed, as the most powerful antioxidant that can keep your skin wrinkle-free.

Vitamins and sulfur, on the other hand, protect the skin and keep it soft and supple, the anti-aging qualities of onion can be attributed to the presence of sulfur-rich phytochemicals.

Massaging your skin with fresh onion juice helps increase blood circulation and improves the overall appearance of your skin by imparting a more youthful and radiant appearance to it.

22 | Treat acne.

The antimicrobial, antibacterial, and anti-inflammatory qualities of onion can work wonders on your skin.

It is a powerful antiseptic that protects your skin against acne-causing bacteria and other skin infections, onions can be used in the treatment of acne and pimples.


For this purpose, you can mix 1 tablespoon of onion juice or extract with 1 tablespoon of olive oil and apply it to your face.

Leave it on for 20 minutes and then wash it off.

Apart from topical application, regular onion consumption can also give miraculous results in the case of acne, some people claim that rubbing onions on your face can give good results, you can probably give it a try and check – there is no harm in any case.

And to treat acne scars, you can use onion extract . Or you can look for creams that have onion extract as one of the ingredients.

We hope the article on the 22 shocking health benefits of eating onions has been of help.


Published by

Recent Posts

  • Side effects

Serious side effects of Xarelto

Discover the serious side effects of Xarelto. The Xarelto is the trade name of rivaroxaban,… Read More

3 weeks ago
  • Side effects

Serious side effects of cetirizine

Discover the serious side effects of cetirizine. The typical symptoms related to allergies, such as… Read More

3 weeks ago
  • Side effects

Side effects of chemotherapy

Discover the side effects of chemotherapy. Chemotherapy works on rapidly dividing cells, regardless of the… Read More

3 weeks ago
  • Side effects

Serious side effects of thalidomide

Discover the side effects of thalidomide. The thalidomide belongs to a class of drugs called… Read More

3 weeks ago
  • Side effects

Serious side effects of colchicine

Discover the side effects of colchicine. Colchicine is a drug used for the treatment of… Read More

3 weeks ago
  • Side effects

Serious side effects of botox

Discover the side effects of botox. The aesthetic treatment with botox is the most widespread… Read More

3 weeks ago