New studies have shown that cinnamon does not control blood sugars or fat levels.
Cinnamon does not appear to have any impact on blood sugar or cholesterol levels in people with diabetes, Connecticut-based researchers report in the journal Diabetes Care.
Dr. Craig I. Coleman, of Hartford Hospital, who was the principal investigator, states, "The preponderance of evidence currently available does not suggest that cinnamon has the ability to decrease a person’s risk of heart disease by helping them control their diabetes or lower their cholesterol."
Several studies have looked at the impact of cinnamon on blood sugar and lipids (fats) in patients with diabetes but had only modest sample sizes and yielded mixed results, Coleman and colleagues note in their report.
This led them to perform a large review, or "meta-analysis," of five studies in which a total of 282 type 1 or type 2 diabetic patients were randomly assigned to receive cinnamon or a placebo and were followed for up to 16 weeks.
All five studies used cinnamon cassia, "the same cinnamon most people have in their spice racks at home," Coleman noted. Doses ranged from 1 to 6 grams daily.
As mentioned, the use of cinnamon did not significantly alter hemoglobin A1C. It also had no effect on fasting blood sugar levels or lipid parameters. Analyses by subgroup and sensitivity did not appreciably alter these results.
Diabetes Care, January 2008.