Tuesday, May 26, 2015. The results of a study of middle-aged men and women revealed a lower risk of mortality among coffee drinkers over an average of 18.7 years of follow-up in comparison with those who did not consume the beverage.
The study, reported in the May 2015 issue of the American Journal of Clinical Nutrition, included 90,914 participants in the Japan Public Health Center-based prospective study who had no history of heart attack, stroke or cancer upon enrollment. Surveys completed at the beginning of the study provided information on coffee intake and other data. The subjects were followed for an average of 18.7 years, during which 12,874 deaths occurred.
In comparison with those who reported almost never drinking coffee, occasional drinkers who consumed less than a cup a day had a 9% lower risk of dying from any cause over follow up, while those who consumed 1-2 and 3-4 cups experienced reductions of 15% and 24%. Coffee was found to be protective for both men and women, and smokers and nonsmokers across all age groups. When cause of death was examined, coffee drinking was associated with a significantly lower risk of mortality from cerebrovascular disease, heart disease and respiratory disease.
As possible mechanisms for coffee against cardiovascular disease, authors Eiko Saito of Japan's National Cancer Center and colleagues observe that the beverage is rich in chlorogenic acid, which slows the rate of glucose absorption and lowers blood pressure. Additionally, caffeine boosts endothelial function by activating nitric oxide synthases and promoting endothelial repair. Coffee also contains pyridinium, which helps prevent excessive blood clotting.
In regard to respiratory disease, caffeine is known to act as a bronchodilator, which improves pulmonary function. The authors additionally note that chlorogenic acid has been associated with a reduction in the risk of mortality due to inflammation.
"This prospective cohort study suggests that habitual intake of coffee may reduce risk of total mortality and deaths from heart disease, cerebrovascular disease, and respiratory disease," the authors conclude. "Additional studies are needed to confirm the benefits of individual substances in coffee and their effects on preventing premature mortality."
|