Green tea is consumed worldwide, especially in East Asian
countries. Green tea contains caffeine and polyphenolic compounds
known as catechins. The most abundant catechin found
in green tea is (-)-epigallocatechin-3-gallate (EGCG),7 which has
been suggested to be responsible for many of the potential health
effects of tea (4,5).
In 1999, Dulloo et al. (6) found that administration of a green
tea extract significantly increased energy expenditure and fat
oxidation in a group of young males. Since then, several clinical
trials have reported the effects of tea preparations on increasing
energy expenditure, fat oxidation, weight loss, fat mass, and
weight maintenance after weight loss (7–9). Nevertheless,
whether these effects are due to catechins or caffeine has yet to
be resolved. Several studies in rodent models showed that green
tea extract decreased weight gain and body fat gain (10,11). In
2005, it was reported that treatment with TEAVIGO, a green tea
extract containing $94% EGCG and #0.1% caffeine, signifi-
Green tea is consumed worldwide, especially in East Asian
countries. Green tea contains caffeine and polyphenolic compounds
known as catechins. The most abundant catechin found
in green tea is (-)-epigallocatechin-3-gallate (EGCG),7 which has
been suggested to be responsible for many of the potential health
effects of tea (4,5).
In 1999, Dulloo et al. (6) found that administration of a green
tea extract significantly increased energy expenditure and fat
oxidation in a group of young males. Since then, several clinical
trials have reported the effects of tea preparations on increasing
energy expenditure, fat oxidation, weight loss, fat mass, and
weight maintenance after weight loss (7–9). Nevertheless,
whether these effects are due to catechins or caffeine has yet to
be resolved. Several studies in rodent models showed that green
tea extract decreased weight gain and body fat gain (10,11). In
2005, it was reported that treatment with TEAVIGO, a green tea
extract containing $94% EGCG and #0.1% caffeine, signifi-
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