In the study, people who regularly drank moderate amounts of coffee daily - less than 5 cups per day - experienced a lower risk of deaths from cardiovascular disease, neurological diseases, Type 2 diabetes and suicide.

The benefit held true for drinking caffeinated and decaffeinated coffee, suggesting it is not just the caffeine providing health perks but possibly the naturally occurring chemical compounds in the coffee beans.

"Bioactive compounds in coffee reduce insulin resistance and systematic inflammation," said Ming Ding, the study's first author and doctoral student at the Harvard TH Chan School of Public Health in Boston, Massachusetts.

Researchers assessed coffee drinking every four years using validated food questionnaires and followed participants for up to 30 years. During the follow-up period, 19,524 women and 12,432 men died from a range of causes.

In general, people who frequently drank coffee were more likely to smoke and drink alcohol. To separate the effects of coffee from smoking, researchers repeated their analysis among never-smokers, and found that the protective benefits of coffee on deaths became even more evident.

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