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Nutrition and Disease

Consumption of Green Tea Extract Results in Osteopenia in Growing Male Mice^1–3,

⁴ Department of Nutrition and Exercise Sciences, Oregon State University, Corvallis, OR 97331; and ⁵ Department of Nutritional Sciences, University of Connecticut, Storrs, CT 06269-4017

Consumption of green tea may reduce body weight gain. Although many disorders are related to obesity, bone mass is positively correlated with body mass. Therefore, our purpose in this study was to determine the effects of green tea extract (GTE) on bone mass and architecture in rapidly growing lean [C57BL/6 wild type (WT)] and genetically obese, leptin-deficient (ob/ob) male mice. Five-week-old lean and ob/ob mice were assigned to diets containing GTE at 0, 1, or 2% for 6 wk. Femoral and lumbar vertebral bone volume and architecture were evaluated by micro-computed tomography (µCT). Following µCT analysis, femora were ashed to determine bone mineral content and density. Compared with WT mice, ob/ob mice had shorter femora (P < 0.001), lower femoral bone volume (P < 0.001), and lower femoral bone mineral content (P < 0.001), but higher cancellous bone volume in lumbar vertebrae (P < 001). Neither genotype nor treatment affected femoral bone mineral density, indicating normal mineralization. GTE consumption resulted in lower femur length, volume, mineral content, cortical volume, and cortical thickness (P < 0.001), as well as lower cancellous bone volume/tissue volume (P < 0.008) and trabecular thickness (P < 0.004) in lumbar vertebrae. The results indicate that leptin is not essential for the reduced gains in body weight and bone mass due to GTE in growing mice and suggest that consumption of large quantities of green tea may reduce the rate of bone accumulation during growth.

^* To whom correspondence should be addressed. E-mail: urszula.iwaniec{at}oregonstate.edu.

Manuscript received 15 March 2009. Initial review completed 30 April 2009. Revision accepted 6 August 2009.

Published online 26 August 2009.