Thermogenic Activity

Although the thermogenic activity of green tea is often attributed to its caffeine content, an in vivo study has shown that stimulation of brown adipose tissue thermogenesis occurs to a greater extent than would be expected from the caffeine content alone (Dulloo et al 2000). The interaction between catechin polyphenols and caffeine on stimulating noradrenaline release and reducing noradrenaline catabolism may be responsible. Clinical investigation has produced similar results, with green tea consumption significantly increasing 24-hour energy expenditure and urinary noradrenaline excretion, whereas an equivalent concentration of caffeine had no effect on these measures (Dulloo et al 2000).

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