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Tea Use Helps Bones, But Caffeine Increases Insulin Resistance


A long-term study shows that habitual consumption of green (nonfermented), black (fermented), or oolong (partially fermented) tea improves bone mineral density (BMD) to a small but important degree. A second study indicates that caffeine consumption can interfere with insulin sensitivity.


Wu C-H et al. Epidemiological evidence of increased bone mineral density in habitual tea drinkers. Arch Intern Med. 2002;162:1001–6.

Keijzers GB et al. Caffeine can decrease insulin sensitivity in humans. Diabetes Care. 2002;25:364–9.