The beneficial effects of green tea have been confirmed in various diseases, such as different
types of cancer, heart disease, and liver disease. The effective components of green tea mainly include tea
polysaccharides and tea polyphenols, such as catechin, particularly (-)-epigallocatechin-3-gallate. Increasing
in vivo and in vitro evidences have explored the potential molecular mechanisms of green tea as well as the
specific biological actions. Moreover, clinical trials have also explored the potential value of green tea components
in treating metabolic syndromes, such as obesity, type II diabetes, and cardiovascular disease. This
study explores the effects of the two major green tea components on the improvement of type II diabetes. It is concluded
that regular consumption of green tea is beneficial for the improvement of high-fat dietary-induced obesity and type II diabetes.