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According to a team of Japanese researchers, theaflavin-3, or TF-3, a substance in black tea, is effective for treating osteoporosis. The team includes Keizo Nishikawa, assistant professor at Osaka University.

The group discovered that DNA methyltransferase, a type of enzyme, increases osteoclast, a cell that destroys bone tissues, and that TF-3 works to block the function of the enzyme.

After TF-3 was administered to mice suffering from osteoporosis, their bone volume recovered to levels similar to those of normal mice, the team said.

In late 2013 The American Journal of Clinical Nutrition published a number of articles on the health benefits of tea. Research found that tea drinking appears to lower the risk for heart disease and stroke and that natural compounds called polyphenols in green tea might protect against several cancers, including those of the prostate, GI tract, lungs, breast, and skin. It also found that caffeine and antioxidants called catechins found in green, oolong, and white teas may increase metabolism and promote weight loss; that tea polyphenols are thought to strengthen bones and protect against fractures; and that people who drink tea could see improvements in mood, concentration, and performance.

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