Those are famous words from the ancient Greek physician
Hippocrates, often called the father of Western medicine.
He actually used
to prescribe garlic to treat a variety of medical conditions.
Well… modern
science has recently confirmed many of these beneficial health effects.
Here are 11 health
benefits of garlic that are supported by human research studies.
1. Garlic Contains
a Compound Called Allicin, Which Has Potent Medicinal Properties
It is closely
related to onions, shallots and leeks.
It grows in many
parts of the world and is a popular ingredient in cooking due to its strong
smell and delicious taste.
However,
throughout ancient history, the main use of garlic was for its health and
medicinal properties
Its use was well
documented by all the major civilizations… including the Egyptians,
Babylonians, Greeks, Romans and the Chinese
This is what
garlic looks like:
The entire “head” is called a garlic bulb, while each segment is called a clove. There are about 10-20 cloves in a single bulb, give or take.
We now know that
most of the health effects are caused by one of the sulfur compounds formed
when a garlic clove is chopped, crushed or chewed.
This compound is
known as allicin, and is also responsible for the distinct garlic smell.
Allicin enters the
body from the digestive tract and travels all over the body, where it exerts
its potent biological effects (which we’ll get to in a bit).
Bottom Line:
Garlic is a plant in the onion family, grown for its cooking properties and
health effects. It is high in a sulfur compound called Allicin, which is
believed to bring most of the health benefits.
2. Garlic Is
Highly Nutritious, But Has Very Few Calories
Calorie for
calorie, garlic is incredibly nutritious.
A 1 ounce (28
grams) serving of garlic contains
Manganese: 23% of
the RDA.
• Vitamin B6: 17%
of the RDA.
• Vitamin C: 15%
of the RDA.
• Selenium: 6% of
the RDA.
• Fiber: 1 gram.
• Decent amounts
of Calcium, Copper, Potassium, Phosphorus, Iron and Vitamin B1.
Garlic also
contains trace amounts of various other nutrients. In fact, it contains a
little bit of almost everything we need.
This is coming
with 42 calories, with 1.8 grams of protein and 9 grams of carbs.
Bottom Line:
Garlic is low in calories and very rich in Vitamin C, Vitamin B6 and Manganese.
It also contains trace amounts of various other nutrients.
3. Garlic Can
Combat Sickness, Including the Common Cold
Garlic
supplementation is known to boost the function of the immune system.
One large 12-week
study found that a daily garlic supplement reduced the number of colds by 63%
compared with placebo
The average length
of cold symptoms was also reduced by 70%, from 5 days in placebo to just 1.5
days in the garlic group.
Another study
found that a high dose of garlic extract (2.56 grams per day) can reduce the
number of days sick with cold or flu by 61%
If you often get
colds, then adding garlic to your diet could be incredibly helpful.
Bottom Line:
Garlic supplementation helps to prevent and reduce the severity of common
illnesses like the flu and common cold.
4. The Active
Compounds in Garlic Can Reduce Blood Pressure
Cardiovascular
diseases like heart attacks and strokes are the world’s biggest killers.
High blood
pressure, or hypertension, is one of the most important drivers of these
diseases.
Human studies have
found garlic supplementation to have a significant impact on reducing blood
pressure in people with high blood pressure
In one study, aged
garlic extract at doses of 600-1,500 mg was just as effective as the drug
Atenolol at reducing blood pressure over a 24 week period
Supplement doses
must be fairly high to have these desired effects. The amount of allicin needed
is equivalent to about four cloves of garlic per day.
Bottom Line: High
doses of garlic appear to improve blood pressure of those with known high blood
pressure (hypertension). In some instances, supplementation can be as effective
as regular medications.
5. Garlic Improves
Cholesterol Levels, Which May Lower The Risk of Heart Disease
Garlic can lower
Total and LDL cholesterol.
For those with
high cholesterol, garlic supplementation appears to reduce total and/or LDL
cholesterol by about 10-15%
Looking at LDL
(the “bad”) and HDL (the “good”) cholesterol specifically, garlic appears to
lower LDL but has no reliable effect on HDL
Garlic does not
appear to lower triglyceride levels, another known risk factor for heart
disease
Bottom Line:
Garlic supplementation seems to reduce total and LDL cholesterol, particularly
in those who have high cholesterol. HDL cholesterol and triglycerides do not
seem to be affected.
6. Garlic Contains
Antioxidants That May Help Prevent Alzheimer’s Disease and Dementia
Oxidative damage
from free radicals contributes to the ageing process.
Garlic contains
antioxidants that support the body’s protective mechanisms against oxidative
damage
High doses of
garlic supplementation have been shown to increase antioxidant enzymes in
humans ,as well as significantly reduce oxidative stress in those with high
blood pressure (6).
The combined
effects on reducing cholesterol and blood pressure, as well as the antioxidant
properties, may help prevent common brain diseases like Alzheimer’s disease and
dementia,.
Bottom Line:
Garlic contains antioxidants that protect against cell damage and ageing. It
may reduce the risk of Alzheimer’s disease and dementia.
7. Garlic May Help
You Live Longer
Effects on
longevity are basically impossible to prove in humans.
But given the
beneficial effects on important risk factors like blood pressure, it makes
sense that garlic could help you live longer.
The fact that it
can fight infectious disease is also an important factor, because these are
common causes of death, especially in the elderly or people with dysfunctional
immune systems.
Bottom Line:
Garlic has known beneficial effects on common causes of chronic disease, so it
makes perfect sense that it could help you live longer.
8. Athletic
Performance Can be Improved With Garlic Supplementation
Garlic was one of
the earliest “performance enhancing” substances.
It was
traditionally used in ancient cultures to reduce fatigue and enhance the work
capacity of labourers.
Most notably, it
was administered to Olympic athletes in ancient Greece
Rodent studies
have shown that garlic helps with exercise performance, but very few human
studies have been done.
Subjects with
heart disease that took garlic oil for 6 weeks had a reduction in peak heart
rate of 12% and improved their exercise capacity.
However, a study
on nine competitive cyclists found no performance benefits.
Other studies
suggest that exercise-induced fatigue may be reduced with garlic.
Bottom Line:
Garlic can improve physical performance in lab animals and people with heart
disease. Benefits in healthy people are not yet conclusive.
9. Eating Garlic
Can Help Detoxify Heavy Metals in the Body
At high doses, the
sulfur compounds in garlic have been shown to protect against organ damage from
heavy metal toxicity.
A four week study
in employees of a car battery plant (excessive exposure to lead) found that
garlic reduced lead levels in the blood by 19%. It also reduced many clinical
signs of toxicity, including headaches and blood pressure .
Three doses of
garlic each day even outperformed the drug D-penicillamine in symptom
reduction.
Bottom Line:
Garlic was shown to significantly reduce lead toxicity and related symptoms in
one study.
10. Garlic May
Improve Bone Health
No human trials
have measured the effects of garlic on bone loss.
However, rodent
studies have shown that it can minimise bone loss by increasing estrogen in
females .
One study in
menopausal women found that a daily dose of dry garlic extract (equal to 2
grams of raw garlic) significantly decreased a marker of estrogen deficiency .
This suggests that
this garlic may have beneficial effects on bone health in women.
Foods like garlic
and onions have also been shown to have beneficial effects on osteoarthritis .
Bottom Line:
Garlic appears to have some benefits for bone health by increasing estrogen
levels in females, but more human studies are needed.
11. Garlic Is Easy
to Include In Your Diet and Tastes Absolutely Delicious
The last one is
not a health benefit, but still important.
It is the fact
that it is very easy (and delicious) to include garlic in your current diet.
It complements
most savory dishes, particularly soups and sauces. The strong taste of garlic
can also add a punch to otherwise bland recipes.
Garlic comes in
several forms, from whole cloves and smooth pastes to powders and supplements
like garlic extract and garlic oil.
The minimum
effective dose for therapeutic effects is one clove eaten with meals, two or
three times a day.
However, keep in
mind that there are some downsides to garlic, such as bad breath. There are
also some people who are allergic to it.
If you have a
bleeding disorder or are taking blood thinning medications, then talk to your
doctor before increasing your garlic consumption.
The active
compound allicin only forms when garlic is crushed or cleaved when it is raw.
If you cook it before crushing it, then it won’t have the same health effects.
Therefore, the
best way to consume garlic is raw, or to crush and cut it and leave it out for
a while before you add it to your recipes.
My favorite way to
use garlic is to press a few cloves of fresh garlic with a garlic press, then
mix with extra virgin olive oil and a bit of salt. This a healthy and super
satisfying dressing.
12. Anything Else?
For thousands of
years, garlic was believed to have medicinal properties. We now have the
science to confirm it.

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