Pu'er Tea extract can help treat the metabolic syndrome that is the precursor to type 2 diabetes, according to the results of a Chinese study. Ninety patients with metabolic syndrome were randomised into two groups. The intervention group received capsules of Pu'er tea extract, while the placebo group took placebo capsules. After three months of treatment, patients’ body mass index, waist-hip ratio, blood lipids, blood sugar, immune and inflammatory markers and oxidation status were tested. Compared with placebo, Pu'er tea demonstrated the ability to improve central obesity, regulate blood lipid levels, lower blood sugar, regulate immunity and decrease oxidation. (A randomized double-blind placebo-controlled study of Pu'er tea extract on the regulation of metabolic syndrome. Chin J Integr Med. 2011 Jul;17(7):492-8).