Green Tea Extract Increases Metabolism, May Aid in Weight Loss. -
There are two ways to lose weight -- either reduce energy intake or
increase energy expenditure. Because hypothyroidism -- even after treatment
-- may reduce energy expenditure in some people, patients naturally are
looking for options that can help safely help raise the metabolism.
In a study reported on in the American Journal of Clinical Nutrition, it was found that
Green Tea Extract
resulted in a significant increase in energy expenditure (a measure of
metabolism), plus also had a significant effect on fat oxidation. While
some of the effects were originally theorized to be due to the caffeine
content of green tea, the researchers discovered that the tea actually has
properties that go beyond those that would be explained by the caffeine.
The same amount of caffeine as was in the green tea, administered alone,
failed to change energy expenditure in other studies. This led researchers
to believe that there is some interaction going on with the active
ingredients of green tea that promotes increased metabolism and fat
The researchers indicated that their findings have substantial implications
for weight control. A 4% overall increase in 24-hour energy expenditure was
attributed to the green tea extract, however, the research found that the
extra expenditure took place during the daytime. This led them to conclude
that, since thermogenesis (the body's own rate of burning calories)
contributes 8-10% of daily energy expenditure in a typical subject, that
this 4% overall increase in energy expenditure due to the green tea
actually translated to a 35-43% increase in daytime thermogenesis.
If critical importance to thyroid patients is the fact that none of the
research subjects reported any side effects, and no significant differences
in heart rates were noticed. In this respect, green tea extract is
different from some of the prescription drugs for obesity, and herbal
products like ephedra, which can raise heart rates and blood pressure, and
are not recommended for many individuals, in particular, those with thyroid
disease who may be particularly sensitive to stimulants.
If you were to incorporate green tea into your weight loss efforts, how is
the best way to go about it?
One way would be to choose a reputable brand of organic green tea at a
health food store or natural grocery, and start by taking a cup of tea
every day. You can also take a green tea extract, in the form of a
Either way, says dietitian Lynn Moss, M.S., R.D., a continuing education
specialist for Pharmavite, makers of Nature Made and Nature's Resource
supplements and herbs, you should definitely take the green tea with meals,
to reproduce the study's conditions as much as possible.
Moss also feels that green tea may be a good choice for thyroid patients
because, unlike caffeine, " green tea has the potential to accelerate
metabolism -- which can help weight loss slightly -- without
overstimulating your adrenal glands. Even a small effect can go a long way,
when you are dealing with a metabolism that may not rebound entirely,
despite hypothyroidism treatment.
SPECIAL NOTE: Is Green Tea Dangerous to the Thyroid?
In response to my article, some readers expressed concerns regarding the
high fluoride content in tea, and the negative relationship between
ingestion of too much fluoride and thyroid problems, as well as This is
definitely something to be considered before deciding to take green tea.
While green tea has some definite benefits in the cancer-prevention and
metabolism-boosting arena, the fluoride content may, according to some
practitioners, be a concern for the public in general, but specifically for
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