Green tea extract promotes gut health, lowers blood sugar
A randomized, double-blind, placebo-controlled, crossover trial in adults with MetS and age- and gender-matched healthy persons who received confections without (placebo) or with 1 g/d GTE (890 mg catechins) for 28 d while following a low-polyphenol diet. Dietary polyphenols, fasting blood glucose, insulin, and lipids were assessed at d 0, 14, and 28 of each intervention. MetS and healthy persons completed the study with high compliance (>95%), no adverse effects, or changes in body mass. Participants’ total polyphenol intakes decreased during each intervention compared with baseline (P < 0.001). Fecal calprotectin and myeloperoxidase were lower (P < 0.05) in GTE compared with placebo regardless of health status. Although fasting insulin, triglycerides, and total and high-density lipoprotein cholesterol were unaffected by treatment, fasting glucose decreased (P < 0.01) in response to GTE regardless of health status.