Introduction : Diabetes mellitus, particularly type II diabetes, is a common metabolic disorder, which imposes a great financial burden on the health system. Tea is a common drink that provides beneficial effects on health. The previous studies have shown that tea consumption, particularly green and hibiscus tea, can affect the metabolic factors in the patients with type II diabetes mellitus. Therefore, the present study aimed to review the current evidence on the effects of green and hibiscus tea consumption on the metabolic factors in the patients with type II diabetes mellitus.

Materials and Methods: We searched some keywords including “diabetes”, “green tea”, and “hibiscus tea” to search the related articles in different databases including PubMed, SID, Magiran, and Iran Medex, published within 1997-2016.

Results: The majority of the retrieved studies demonstrated the positive effects of the intake of green and hibiscus tea extracts on blood glucose, triglyceride, and cholesterol levels. In addition, the consumption of green and hibiscus tea was reported to improve the blood factors of the patients with T2DM through the elevation of the serum adiponectin level.

Conclusion: As the findings of the reviewed articles indicated, the intake of green and hibiscus tea extracts have an effective role in the prevention and treatment of type II diabetes mellitus. However, further studies are needed to determine the effective doses of green and hibiscus tea on type II diabetes mellitus.