In February 2019 researchers from Iran published their review of the medical scientific literature to assess the effect of cinnamon supplementation on obesity. A total of 12 studies involving 786 individuals were included. Results showed that cinnamon supplementation significantly decreased body weight, BMI, waist circumference and body fat. A further analysis revealed that a greater effect from the cinnamon supplementation was experienced by individuals aged under 50 years and with a BMI of over 30. Cinnamon supplementation of over 2 g/day was seen to significantly reduce body fat when administered for a period of over 12 weeks.
Mousavi SM et al. Cinnamon supplementation positively affects obesity: A systematic review and dose-response meta-analysis of randomized controlled trials. Clin Nutr. 2019 Feb 15. [Epub ahead of print]