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If you're looking for a morning beverage that provides energy without the side effects of coffee, you might consider trying yerba mate, the mostly widely consumed beverage in South America or green tea, enjoyed for centuries in its native China before being marketed in the western world. Both yerba mate, taken from the leaves of a holly plant, and green tea contain antioxidants associated with health benefits such as weight loss and heart disease prevention.
Green Tea Health Benefits
Green
tea may reduce the risk of cardiovascular disease and some forms of
cancer, according to C. Cabrera and colleagues at the Universidad de
Granada, who reviewed numerous studies about green teas and published
their findings in June 2006 in the "Journal of the American College of
Nutrition." Cabreras said studies also showed promise for green tea's
contribution to oral health, bone density and weight control. He said
all of the studies showed positive health benefits from drinking green
tea, but that more research was needed to fully understand green tea's
potential.
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Green Tea and Yerba Mate May Lower Cholesterol
High
levels of low density lipoprotein -- LDL -- cholesterol put people at
higher risk for heart disease and at least one study demonstrates the
cholesterol-lowering properties of yerba mate. Drinking 3 cups of yerba
mate daily helped lower LDL cholesterol by more than 8 percent in a
Brazilian study led by E.C. Demorais and published in October 2009 in
the "Journal of Agricultural and Food Chemistry." In the United States,
S.I. Koo and colleagues at the University of Connecticut found that
green tea was a safe and effective agent in lowering cholesterol and
triglycerides, according to research published in 2007 in the "Journal
of Nutritional Biochemistry."
Different Types of Antioxidants in Green Tea and Yerba Mate
Yerba
mate contains nearly all vitamins needed to sustain life, according to
the Pasteur Institute. It contains more antioxidants than green tea, 15
amino acids and numerous vitamins and minerals, including B vitamins,
vitamin C, zinc, potassium and manganese. The primary antioxidant in
yerba mate is chlorogenic acid and the primary antioxidant in green tea
is epigallocatechin gallate compounds, more commonly referred to as
catechins. Both chlorogenic acid and catechins contain properties known
to reduce the risk of heart disease and cancer, but consumption of
antioxidants doesn't necessarily translate into a health benefit,
according to K. Simon Yeung, clinical coordinator and research
pharmacist at Memorial Sloan-Kettering Cancer Center in New York City.
Green Tea and Weight Loss
Obesity
researchers have studied green tea catechins for their ability to boost
metabolism and lower blood sugar. Several clinical trials positively
link consumption of green tea catechins to weight loss. Among them is
one by Kevin Maki that compared the effects of adding green tea and
black to the diets of persons who were following moderately
calorie-restricted diets. People who drank green tea containing 660 mg
of catechins lost 5.3 lb. in the study, compared to weight loss averages
of 2.8 lbs. for the black tea containing 22 mg of catechins. According
to the study published in 2009 in the "American Journal of Clinical
Nutrition," the men who drank green tea also lost significantly more
abdominal fat.
Risks
Both
green tea and yerba mate contain caffeine. The amount in each varies
considerably by manufacturer and processing type. Most green teas and
some yerba mate drinks contain less caffeine than coffee, but anyone
sensitive to caffeine -- people with nervous disorders and pregnant and
nursing women, for instance -- should carefully check labels and consult
their physicians before consuming caffeinated drinks. High consumption
of yerba mate may increase your risk of lung, esophageal and oral
cancers, according to Yeung. Some of the risk may be associated with the
traditional way of drinking yerba mate at high temperatures through a
metal straw.
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