For 4,000 years, Asians have regarded green
tea as something more than just a beverage. Green tea was used as herbal
medicine and treatment for everything from headaches to depressions and even to
weight loss.
Researches
have been conducted over the last few years to identify what compound present
in green tea makes it a potent health drink. The scientists have found that
green tea contains several antioxidants which are responsible for many of green
tea’s health benefits, including weight loss benefit.
A
research study by American and Swiss scientists on the weight loss benefit of
green tea was concluded and the results of which were published in the American
Journal of Clinical Nutrition and Urology. During the course of their study,
they have found that green tea contains certain compounds that contribute to
its weight loss benefit.
Lead
researcher, D. Abdul Dulloo said in a press release that there are only two
ways to achieve weight loss – either reduce energy intake or increase energy
expenditure. Green tea, it seems, has compounds that can increase the body’s
normal metabolism rate, thus giving it its weight loss benefit.
At
the University of
Geneva , where the study
was conducted, Dr. Dulloo and his colleagues experimented on ten healthy young
men. They theorized that the main contributor to green tea’s weight loss
benefit is its caffeine content. To test this hypothesis on green tea’s weight
loss benefit, they placed the study’s participants on a typical “Western” diet
which is about forty percent fat, thirteen percent protein, and forty-seven
percent carbohydrates.
Thrice everyday, the
researchers measured their subjects’ energy expenditure (the measurement used
in determining the number of calories burned in 24 hours) and monitored their
respiration quotient to find out how well they utilized their carbohydrates,
proteins, and fats.
When they interpreted
the data they collected, they found out that the men receiving regular dosages
of green tea extract showed a significant increase in their 24-hour energy
expenditure and a reduction in their respiration quotient (which means that
more fat is burned, thereby achieving maximum weight loss). On the other hand,
those men who were only given caffeine or placebo with every meal showed only
minimal increases in their metabolism rates.
The scientists
construed that the substance catechin polyphenol present in green tea adds to
its weight loss benefit. These substances in green tea may alter how the body
uses the hormone norepinephrine which is responsible for increasing the
metabolism rate, thus leading to weight loss.
In their conclusion,
the scientists inferred that green tea owes its weight loss benefit to the
presence of antioxidants and the substance catechin polyphenol. These
substances help increase fat and calorie burning and optimize weight loss.
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