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Abstract
Moderate coffee consumption has been inversely associated with mortality; however, it remained unclear whether heavy intake, particularly among those with common genetic polymorphisms that impair caffeine metabolism, increases risk of mortality. In this large prospective cohort study of a half million people, we found inverse associations for coffee drinking with mortality, including among participants drinking 1 up to 8 or more cups per day. We found no differences in the coffee-mortality association when we stratified by genetic polymorphisms affecting caffeine metabolism. In conclusion, this study provides further evidence that coffee drinking can be part of a healthy diet and offers reassurance to coffee drinkers.
Potential interactions between coffee consumption, genetic polymorphisms, diabetes, liver and cardiovascular disease, and total and cause-specific mortality