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Effect of green tea on resting energy expenditure and substrate oxidation during weight loss in overweight females

Published online by Cambridge University Press:  08 March 2007

Kristel Diepvens*
Affiliation:
Maastricht University, Maastricht, The Netherlands
Eva M. R. Kovacs
Affiliation:
Unilever Food and Health Research Institute, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands
Ilse M. T. Nijs
Affiliation:
Maastricht University, Maastricht, The Netherlands
Neeltje Vogels
Affiliation:
Maastricht University, Maastricht, The Netherlands
Margriet S. Westerterp-Plantenga
Affiliation:
Maastricht University, Maastricht, The Netherlands
*
*Corresponding author: Kristel Diepvens, fax +31 43 3670976, email K.Diepvens@HB.Unimaas.NL
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Abstract

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We assessed the effect of ingestion of green tea (GT) extract along with a low-energy diet (LED) on resting energy expenditure (REE), substrate oxidation and body weight as GT has been shown to increase energy expenditure and fat oxidation in the short term in both animals and people. Forty-six overweight women (BMI 27·6 (sd 1·8) kg/m2) were fed in energy balance from day 1 to day 3, followed by a LED with GT (1125 mg tea catechins +225 mg caffeine/d) or placebo (PLAC) from day 4 to day 87. Caffeine intake was standardised to 300 mg/d. Energy expenditure was measured on days 4 and 32. Reductions in weight (4·19 (sd 2·0) kg PLAC, 4·21 (sd 2·7) kg GT), BMI, waist:hip ratio, fat mass and fat-free mass were not statistically different between treatments. REE as a function of fat-free mass and fat mass was significantly reduced over 32 d in the PLAC group (P<0·05) but not in the GT group. Dietary restraint increased over time (P<0·001) in both groups, whereas disinhibition and general hunger decreased (P<0·05). The GT group became more hungry over time and less thirsty, and showed increased prospective food consumption compared with PLAC (P<0·05). Taken together, the ingestion of GT along with a LED had no additional benefit for any measures of body weight or body composition. Although the decrease in REE as a function of fat-free mass and fat mass was not significant with GT treatment, whereas it was with PLAC treatment, no significant effect of treatment over time was seen, suggesting that a robust limitation of REE reduction during a LED was not achieved by GT.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2005

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