Costello, R.B., Dwyer, J.T., Saldanha, L., Bailey, R.L., Merkel, J., Wambogo, E. (2016). Do cinnamon supplements have a role in glycemic control in type 2 diabetes? A narrative review. Journal of the Academy of Nutrition and Dietetics. 116(11) 1794-1802.
We’ve all read Facebook posts that claim cinnamon helps diabetes, turmeric helps crohn’s disease, and so on and so forth. This review set out to either prove or disprove the theory that cinnamon can help lower Hemoglobin A1c (HbA1c) levels and fasting blood glucose in people with type 2 diabetes mellitus. There were eleven studies found from PubMed, which included 649 adults total. The subjects were all kept on their regular medicines during the trial period, which lasted anywhere from 4-16 weeks depending upon the study, with dosages of 120-6,000 mg of cinnamon per day. The cinnamon species also varied, which may have played a part in the results. The authors were unable to conduct a meta-analysis because of the numerous differences in the studies methods. The results found that all of the studies reported a reduction in fasting blood glucose in HbA1c levels. The placebo groups in the studies had very insignificant reductions in both of these tests. Only four of the studies actually achieved the goals set by the American Diabetes Association for both of these tests. The analysis concluded that cinnamon can be added as a factor to help reduce FBG and HbA1c levels in combination with lifestyle change, diet guidance, and regular hypoglycemic drugs and that larger studies need to be conducted in order to prove or disprove this theory.