Drinking two to three cups of coffee daily may reduce your risk of death from heart disease, diabetes and suicide, researchers including those of Indian-origin have claimed.
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.
"They might be responsible for the inverse association between coffee and mortality. However, more studies are needed to investigate the biological mechanisms producing these effects," said Ding.
The findings are based on data from three large ongoing studies: 74,890 women in the Nurses' Health Study; 93,054 women in the Nurses' Health Study 2; and 40,557 men in the Health Professionals Follow-up Study.
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.
"Regular consumption of coffee can be included as part of a healthy, balanced diet," said senior author Frank Hu, a Professor of Nutrition and Epidemiology at Harvard.
"However, certain populations such as pregnant women and children should be cautious about high caffeine intake from coffee or other beverages," said Hu.
The study by researchers, including Ambika Satija and Shilpa N Bhupathiraju, both from Harvard, was not designed to show a direct cause and effect relationship between coffee consumption and dying from illness. So the findings should be interpreted with caution, researchers said.
Previous studies found inconsistent associations between coffee drinking and risk of total and cause-specific death. The new study adds to the literature that moderate coffee consumption may confer health benefits.