Study Investigates Coffee Consumption and Metabolism

Background on Type 2 Diabetes

Type 2 diabetes remains a significant health concern affecting numerous adults globally. While some research indicates that regular coffee drinkers may have a lower risk of developing type 2 diabetes, a definitive connection between coffee consumption and reduced diabetes rates has yet to be established. Furthermore, certain studies have observed that coffee consumption after meals can lead to elevated blood sugar levels, raising questions about its impact on glucose metabolism.

Research Overview

A recent study, published in the British Journal of Nutrition, explored the long-term effects of coffee consumption on glucose metabolism. The research involved 27 adults, excluding individuals who smoked or consumed more than four servings of coffee or tea weekly. Participants were randomly assigned to either a “coffee” group or a “control” group, which abstained from caffeine.

Study Methodology

At the study’s outset, researchers measured participants’ blood pressure, blood sugar, cholesterol, and insulin levels. The coffee group was instructed to consume four servings of instant coffee daily for 12 weeks, while the control group avoided all caffeinated products during this period. Throughout the study, participants provided blood, saliva, and cheek swab samples for subsequent analysis.

Findings and Genetic Analysis

The study did not reveal any significant overall effects of coffee consumption over the 12-week period. However, genetic analysis of DNA from cheek swab samples identified small changes in the CYP1A2 gene, which influences caffeine metabolism. Participants with “slow” caffeine metabolism exhibited higher glucose levels both in fasting states and post-meal, along with increased fatty acids in their bloodstream, indicating reduced insulin sensitivity.

Conclusion

This research is pioneering in assessing the long-term effects of coffee consumption on sugar and fat metabolism in healthy individuals who do not typically drink coffee. Although further studies are necessary to clarify the relationship between coffee consumption and diabetes prevention, the findings suggest that genetic factors play a role in metabolic responses to coffee.

About the Author

Written by Cindi A. Hoover, Ph.D.

References

Robertson TM, Clifford MN, Penson S et al. Postprandial glycaemic and lipaemic responses to chronic coffee consumption may be modulated by CYP1A2 polymorphisms. Br J Nutr. 2018; 119:792-800.
http://blog.journals.cambridge.org/2018/06/12/do-your-genes-determine-whether-coffee-is-good-or-bad-for-you/