Onion (Allium cepa) is a vegetable that belongs to genus
Allium, the same family as chives, garlic, leeks, scallions and shallots. The
onions are believed to be originated in central Asia, possibly in the
Iran-Pakistan region. Today, they are probably the most widely cultivated
species in the lily family, Allium.
There are many different varieties of onions, where red,
yellow, and white onions are the most popular. Each of this variety has its own
unique flavor, from very strong to mildly sweet flavor.
The onions have been used for thousands of years as an
ingredient in various dishes by many cultures around the world. These vegetables
can be eaten raw, cooked, fried, dried or roasted. They are commonly used as a
flavoring and seasoning agent in many dishes.
Apart from adding an excellent taste to dishes, onions are
also providing many health benefits to its users. In Chinese medicine, onions
have been used to treat angina, coughs, bacterial infections, and respiratory
problems. And even the World Health Organization (WHO) also supports the use of
onions for the treatment of poor appetite and preventing atherosclerosis. Some
health benefits of onions are as given below:
1) Fight Cancer
Onion extract is rich in a variety of sulfides, which
provide some protection against tumor growth. Some studies have shown, regular
consumption of onions helps to reduce the risk of several cancers such as
colorectal cancer, oral cancer, laryngeal cancer, stomach cancer, esophageal
cancer, and ovarian cancer. It is suggested to consume one onion serving per
day (approximately 1/2 cup).
2) Cardiovascular
Benefits
The regular consumption of onion has been shown to lower
high blood pressure and high cholesterol levels. This is attributed to the
sulfur compounds, chromium, and vitamin B6 in onions, which helps prevent heart
disease by lowering high homocysteine levels, another potential risk factor for
heart attack and stroke.
3) Reduce Blood
Sugar Levels
The regular consumption of onions also have been shown to
lower the blood sugar levels. A study found that, onions contain allyl propyl
disulfide that helps to reduce the glucose levels by increasing the amount of
insulin.
4) Promotes
Gastrointestinal Health
Onions packed with enormous flavonoids, these flavonoids
help to reduce the risk of colon cancer. It has been shown to inhibit the
growth of tumors in animals and to protect colon cells from the damaging
effects of certain cancer-causing substances.
5) Good for Skin
The onions help in stimulating the circulation of blood in
the mucous membrane. It can be applied as poultice to boils, bruises, wounds,
etc. Onion juice mixed with honey also can be the best home remedy for acne.
6) Stimulate Hair
Growth
Onion is rich in sulfur, which is one of the essential
nutrients in promoting hair growth. A study has shown that applying onion juice
on the scalp twice a week for 2 months will stimulate hair regrowth.
7) Treats Cholera
Onion is an effective remedy for cholera. Grind about 30
grams of onions with 5-7 black peppers. Have 2-3 times of the mixture a day.
This is an effective treatment for cholera. On the other hand, this also helps
to lessens diarrhea and vomiting.
8) Maintain Bone
Health
A study published in the Journal of Agriculture and Food
Chemistry revealed that onions also possess the ability of building connective
tissue and bone health due to a newly identified substance in it called growth
plate chondrocytes (GPCs). Hence onions are very beneficial for women who are
at a risk for osteoporosis. There is also evidence to suggest that the risk of
hip fracture in menopausal women may be lowered through regular consumption of
onions.
9) Remedy for Cold
and Flu
Onion is also a great remedy for cold and flu. The Native
Americans used them to ward off the common cold and flu. The World Health
Organization has even recognized the onion for its ability to help relieve flu
symptoms such as coughs, bronchitis, congestion, and respiratory infections.
10) Relieve Tooth
Disorders
Recent research shows that onions may kill bacteria that
cause tooth decay and other dental problems. Chewing a raw onion for two to
three minutes could kill all the germs in the mouth. Placing a small piece of
onion on the affected tooth or bad tooth can also help in relieving toothache.
11) Treat Urinary
Disorders
Onion has diuretic properties, which are useful in treating
urinary disorders. For those suffering from a burning sensation during
urination, drink water boiled with 6 to 7 mg of onion, this may relieve the
symptoms.
12) Prevents Blood
Clot
Onions are considered as natural anti-clotting agents. The
sulfur contents in the onions can suppress clumping of platelets, thereby help
in preventing blood clot.
13) Improve Digestive
Function
Onions are a good source of dietary fiber and prebiotics
that encourage the growth of good bacteria in the digestive system, thereby
improving digestive function.
14) Protect against
Allergies
The onions such as red onions are rich in Quercetin, an
antioxidant which is known to have anti-inflammatory and anti-allergy
properties. Flavonoid contained in them blocks the allergy creating histamine
and other substances. According to a recent study, eye symptoms associated with
hay fever are greatly reduced by quercetin. The suggested dosage is 200-400 mg
thrice a day.
15) Anti-Inflammatory
Benefits
The quercetin found in onions, along with other substances,
help promote a healthy immune system. These substances act as anti-inflammatory
agents, which reduce the effect of inflammatory diseases such as rheumatoid
arthritis.
When buying onions, choose the fresh ones that are clean, well-shaped,
and have no opening at the neck. Avoid those that show sprouting or have signs
of black mold as they indicate that the items are old. In addition, poor
quality bulbs often have soft spots, moisture at their neck, and dark patches,
which may all be indications of decay.
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