Tea isn't just a comforting and pleasant beverage, it also has
remarkable healing properties-so much so that it's deemed a sort of
"wonder drink" that may be even healthier than drinking water.
Here are all the ways drinking tea can lead to a healthier, longer
life-and how to maximize both the enjoyment of the drink and its health
benefits.
Not Just for Pleasure: The Many Health Benefits of Tea
Tea is the
second most widely consumed beverage in the world,
after water. That's because it's so versatile: You can drink it iced or
hot, and there are enough varieties of tea to suit just about any
palate (there are over
1,500 types of tea-not including herbal teas).
People have been drinking tea for centuries also because of its health
effects. Much research suggests drinking tea-particularly green tea-can
fight diseases and even lengthen life. This is due to tea's high
concentration of antioxidants called polyphenols, which
may contribute to the prevention of cancer, osteoporosis, and cardiovascular diseases. While polyphenols are also found in abundance in fruits, vegetables, and grains-and also
coffee in even higher amounts-tea is especially and uniquely rich in particular types of polyphenols called catechins (specifically,
EGCG) that may be the most powerful ones of all.
Cancer Prevention
The American Cancer Society
explains:
EGCG may help cause certain types of cancer cells to die in much the
same way that normal cells do. This effect is important because cancer
cells are different from normal cells in that they do not die when they
should-they continue to grow and spread.
Although
the ACS says more clinical trials are needed to support claims that
green tea can prevent or treat any specific types of cancer, it notes
the many laboratory studies demonstrating green tea's protective effects
against cancer cells. One study, for example, found EGCG to
suppress lung cancer cell growth and another found that it
inhibits breast cancer tumors. A
meta-analysis of 13 studies
indicates women who drink green tea have a lower risk of developing
breast cancer than non-green-tea drinkers. Like most scientific
research, however, there's other conflicting results suggesting black
and green tea
might not
contribute significantly to breast cancer risk-so you probably
shouldn't drink tea for the sole purpose of preventing cancer. That's
okay, because there are lots of other positive health associations with
tea.
Protection Against Heart Diseases and High Blood Pressure
A
study of 40,530 people in Japan,
where green tea is widely consumed, found drinking green tea
significantly lowered the risk of dying from cardiovascular disease.
(31% lower risk in women, and 22% lower risk in men.) The risk of dying
from stroke was even lower: 62% lower in women and 42% lower in men. The
catechins in green tea are believed to inhibit the production of free
radicals in the lining of the arteries and also help prevent the
formation of blood clots.
Regular consumption of green or oolong tea (for at least one year) also has
been shown
to lower the risk of developing hypertension by 46% for those who drank
up to 2.5 cups a day and 65% less for those who drank more than 2.5
cups.
A review, published in the Journal of the American College of Nutrition,
concludes that "green tea and EGCG can be regarded as food components useful for the maintenance of cardiovascular and metabolic health."
Lower Risk of Death from All Causes
The Japanese cohort study mentioned above examined the relationship
between green tea drinking and death from all causes. The researchers
followed the Japanese adults (ages 40 to 79) for up to 11 years and
compared those who drank less than one cup of green tea a day to those
drinking five or more a day.
The results? Drinking green tea was
associated with a 23% lower risk of dying from any cause in women and
12% lower risk in men.
Brain Boosts
Drinking tea can contribute to both relaxation and concentration. As Tea Class
explains:
L-theanine is an amino acid that occurs naturally in the Camellia
Sinensis plant. In fact, unless you take an artificially manufactured
dietary supplement, tea is the ONLY way to get L-theanine in your diet.
This powerful amino acid boosts alpha wave activity in our brains, which
promotes a state of relaxed concentration. Think "quiet alertness". The
calming effects of L-theanine actually counteract the extreme highs and
jitteriness that can result from excessive Caffeine intake.
As
with almost all other essential elements in the leaf, L-theanine is most
highly concentrated in the newest growth. A high quality loose leaf tea
will contain the most L-theanine, and the very highest levels are
usually found in green and white teas.
And Lots, Lots More
Studies have also associated drinking green tea with
lower LDL or "bad" cholesterol and reduced body fat,
inhibition of the flu virus, and even
less dental plaque. The book
Green Tea by Nadine Taylor also cites these benefits:
- Keeping blood sugar at moderate levels
- Fighting food-borne bacteria
- Enhancing immune system function
- Promoting "friendly" bacteria in the intestines and encouraging bowel regularity
- Assisting in weight loss by blocking the breakdown of starch
- Maintaining the body's fluid balance
- Reducing stress
Taylor writes:
No other substance on the face of the earth, including the most potent
drug, can claim such wide-ranging and powerful health benefits, and all
without a single side effect.
Well,
some side effects
have been noted with drinking too much green tea extract or supplements
(not the drink itself), and pregnant women might want to avoid large
amounts of green tea as well.
It's true that tea contains caffeine, which affects everyone differently, but tea generally contains less caffeine than coffee, and the caffeine in tea is
metabolized more slowly, so you can drink more cups all day long without crashing.
How to Choose and Brew Tea for Better Health Benefits
Now that we know some of the many potential ways green tea can make us
healthier, let's look at how to buy and brew it optimally.
Types of Tea: Most
of the studies have focused on the health benefits of green tea, but
what about black and other types of tea? Green tea has more wide-ranging
and powerful benefits mainly because of its high amounts of EGCG,
whereas black tea has much less because of the way the leaves are
"fired" and oxidized during production. Still, black and other teas also
share these important compounds and benefits.
Acne Einstein reports these mean levels of EGCG in different teas per cup, as measured by the USDA:
- Brewed green tea: 180mg
- Brewed green tea, decaffeinated: 60mg
- Brewed green tea, flavored: 45mg
- Ready-to-drink green tea: 10mg
- Brewed oolong tea: 80mg
- Brewed black tea: 20mg
The report doesn't mention white tea, which has similar EGCG content as
green tea, but might have even more health benefits than green tea
because it's even less processed. White tea, however, is rarer than
green and thus less studied.
Antioxident content, however, also varies depending on the tea types, brand, and manufacturing.
Tea Brands: Speaking of tea brands,
ConsumerLab
tested green tea bottled drinks, brewable teas, and supplements to find
which had the highest levels of EGCG and other catechins. News Observer
reports:
Of the 14 bottled tea and tea supplements that listed levels of EGCG on
the label, only three contained significantly less than the amount
claimed. The 17-ounce bottle of Honest Tea Green Tea with Honey, for
example, had only about two-thirds of the 190 milligrams of the listed
catechins, which includes EGCG and other beneficial compounds. (Experts
recommend consuming 200 milligrams of EGCG a day for the greatest
benefit.)
Among products that don't list EGCG levels - including
all of the brewed teas - findings were more varied. Teavana Green Tea
Gyokuro Imperial, sold as loose tea, had 86 milligrams of EGCG per
serving, while one bag of Bigelow Green Tea had only 25 milligrams. To
get the recommended amount of EGCG, you'd have to drink about 2 1/2 cups
of the former, eight cups of the latter. (Helpful hint: Steep tea in
hot water for three to five minutes to fully extract the EGCG.)
Teavana's is more expensive, however ($2.18 to get the equivalent of
200 mg of EGCG versus $0.27 to $0.60 per tea bag). Bigelow's had the
highest amount of EGCG of the bagged, supermarket teas.
Temperature and Brewing Time:
Things that additionally affect the EGCG content and antioxidant
potential include your water temperature and brewing time. While
following
general time and temperature recommendations
is great for brewing a cup of tea for flavor, if you care about getting
the most health-boosting benefits of a cup of tea, Acne Einstein has
found:
- Brewing with hotter water results in more antioxidants in the tea
- Steeping for three to five minutes is better than less time
This goes against the usual tea rules for different types (green tea is
usually brewed with water at 175 degrees F and for just a minute or
so), so you might get a stronger-tasting or even bitter cup, depending
on the leaves. Oolong teas, however, often do well with longer steeping
time and higher temperatures.
How Many Cups to Drink a Day: Most
of the studies suggest the more cups of tea you drink a day (e.g., five
or more), the better, but some also found benefits with just two to
three cups a day, which is what nurse practitioner and physician
assistants network
Advanced Healthcare
recommends for patients as a "simple healthy lifestyle strategy."
(Don't worry, tea is hydrating and doesn't act as a diuretic.) The
two-to-three cups a day recommendation fits in with most supplements'
200 mg EGCG recommended daily serving.
All this said, it's silly
to guzzle down thermoses of tea if you don't enjoy it. Even if you
prefer stronger drinks like coffee, however, you might be surprised to
learn you might just enjoy a good cup of tea too (and get the health effects as a nice side benefit).
Photos by Photosani (Shutterstock), ~Mers.