Black tea can benefit your blood pressure, suggests new
research published in The American Journal of Clinical Nutrition. This
idea builds upon an earlier JAMA study that found black tea can reduce
hypertension & risk of cardiovascular disease. There's, also,
research that shows black tea can lower prevalence of diabetes.
Which begs the question: is black tea best for you, or are
there healthier options, such as green or white? Either or, says
Michelle Davenport, PhD, a nutritionist in San Francisco. "Black and
green tea are both from the plant Camellia sinensis and both are high in
flavonoid content. Flavonoids have antioxidant activity, which has been
shown to fight the oxidation and inflammation associated with
cardiovascular disease," she says. |
Types of Teas and Their Health Benefits
From green tea to hibiscus, from white tea to chamomile,
teas are chock full of flavonoids and other healthy goodies.
Borrowed from: WebMD Feature
By Julie Edgar Reviewed by Louise Chang, MD
Regarded for thousands of years in the East as a key to good
health, happiness, and wisdom, tea has caught the attention of
researchers in the West, who are discovering the many health benefits of
different types of teas.
Studies have found that some teas may help with cancer,
heart disease, and diabetes; encourage weight loss; lower cholesterol;
and bring about mental alertness. Tea, also, appears to have
antimicrobial qualities.
“There doesn’t seem to be a downside to tea,” says American
Dietetic Association spokeswoman Katherine Tallmadge, MA, RD, LD. “I
think it’s a great alternative to coffee drinking. First, tea has less
caffeine. It’s pretty well established that the compounds in tea, their
flavonoids, are good for the heart and may reduce cancer.”
Although a lot of questions remain about how long tea needs
to be steeped for the most benefit, and how much you need to drink,
nutritionists agree any tea is good tea. Still, they prefer brewed teas
over bottled to avoid the extra calories and sweeteners.
Health Benefits of Tea: Green, Black, and White Tea
Tea is a name given to a lot of brews, but purists consider
only green tea, black tea, white tea, oolong tea, and pu-erh tea the
real thing. They are all derived from the Camellia sinensis plant, a
shrub native to China and India, and contain unique antioxidants called
flavonoids. The most potent of these, known as ECGC, may help against
free radicals that can contribute to cancer, heart disease, and clogged
arteries.
All these teas also have caffeine and theanine, which affect the brain and seem to heighten mental alertness.
The more processed the tea leaves, usually the less
polyphenol content. Polyphenols include flavonoids. Oolong and black
teas are oxidized or fermented, so they have lower concentrations of
polyphenols than green tea; but their antioxidizing power is still high.
Here's what some studies have found about the potential health benefits of tea:
1. Green tea: Made with steamed tea leaves, it has a high
concentration of EGCG and has been widely studied. Green tea’s
antioxidants may interfere with the growth of bladder, breast, lung,
stomach, pancreatic, and colorectal cancers; prevent clogging of the
arteries, burn fat, counteract oxidative stress on the brain, reduce
risk of neurological disorders like Alzheimer’s and Parkinson’s
diseases, reduce risk of stroke, and improve cholesterol levels.
2. Black tea: Made with fermented tea leaves, black tea has
the highest caffeine content and forms the basis for flavored teas like
chai, along with some instant teas. Studies have shown that black tea
may protect lungs from damage caused by exposure to cigarette smoke. It
also may reduce the risk of stroke.
3. White tea: Uncured and unfermented. One study showed that
white tea has the most potent anticancer properties compared to more
processed teas.
4. Oolong tea: In an animal study, those given antioxidants
from oolong tea were found to have lower bad cholesterol levels. One
variety of oolong, Wuyi, is heavily marketed as a weight loss
supplement, but science hasn’t backed the claims.
5. Pu-erh tea: Made from fermented and aged leaves.
Considered a black tea, its leaves are pressed into cakes. One animal
study showed that animals given pu-erh had less weight gain and reduced
LDL cholesterol. |
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