Drinking Coffee Linked to Lower Risk of Death, Study Finds

When headlines claim coffee might help you live longer, it’s natural to wonder: is there real science behind the idea, or just another health fad? A landmark study published in the New England Journal of Medicine set out to answer that question by examining one of the largest and most detailed datasets on coffee consumption and mortality to date.

Yes, according to a 12-year NIH-AARP study tracking over 400,000 Americans aged 50–71, regular coffee drinkers—whether they consumed caffeinated or decaffeinated coffee—had a lower risk of death. Men drinking 2–6 cups daily had 10% lower mortality; women had 15% lower mortality compared to non-drinkers. These results held even after adjusting for smoking, diet, exercise, and alcohol use.

The Largest Study Yet on Coffee and Longevity

Conducted by the National Institutes of Health and AARP (NIH-AARP), this observational study followed more than 400,000 participants between the ages of 50 and 71 for 12 years. By the end of the study period, approximately 52,000 of the individuals had died. This makes it one of the largest and most methodologically robust studies ever conducted on diet, coffee, and mortality.

Earlier research on coffee’s health effects often produced conflicting results, partly because coffee drinkers were also more likely to smoke, drink alcohol, eat poorly, or skip exercise—all behaviors linked to worse health outcomes. This new study accounted for those confounding factors.

What the Data Really Shows About Coffee and Death Rates

After adjusting for lifestyle factors like smoking, poor diet, low exercise, and high alcohol intake, researchers still found that higher coffee consumption was associated with lower death rates from several major causes:

• Diabetes
• Heart disease
• Respiratory diseases
• Stroke
• Infections
• Injuries and accidents

The risk of death decreased as coffee intake increased. Specifically, people who drank 2–6 cups per day saw significant benefits: men had a 10% lower mortality rate, and women had a 15% lower rate compared to non-coffee drinkers. This applied to both caffeinated and decaffeinated coffee, suggesting compounds other than caffeine may contribute to the effect.

While the study didn’t find a strong direct link between coffee and overall cancer risk, it did suggest a modest reduction in total cancer incidence. Drinking one cup of coffee per day was associated with about a 3% lower risk of certain cancers, including bladder, breast, colorectal, endometrial, esophageal, liver, leukemia, pancreatic, and prostate cancers.

Coffee’s Health Effects: Benefits, Risks, and What We Still Don’t Know

Dr. Neal Freedman, the study’s lead author and a researcher at the National Cancer Institute, urged caution in interpreting the results. “These data show a correlation, not causation,” he said. “We can’t say for sure that drinking more coffee makes you healthier.” He emphasized that while coffee appears beneficial overall, other lifestyle choices—like eating fruits (especially berries) or drinking green tea—might be even better for your health.

Most healthy adults can safely consume up to 1,000 mg of caffeine per day—that’s roughly 10 cups of coffee—without adverse effects. However, pregnant individuals should limit caffeine to under 200 mg per day.

Coffee isn’t risk-free. It may worsen conditions like insomnia, anxiety, acid reflux, high blood pressure, and certain heart rhythm disorders. Unfiltered coffee (like French press or boiled coffee) contains compounds that can raise cholesterol, though these are mostly removed by paper filters—making drip coffee a potentially better choice. In one unusual medical case, excessive hot coffee enemas even led to rectal perforation.

Coffee and Health: The Known Pros and Cons

Benefits

• May lower suicide risk in women
• Helps prevent gallstones and gallbladder disease in men
• Caffeine can ease asthma symptoms in some cases
• Increases alertness and extends work endurance
• Enhances short-term memory
• Boosts effectiveness of some migraine medications
• Lowers liver cirrhosis risk in heavy drinkers
• Improves exercise endurance by delaying muscle fatigue
• Contains antioxidants that may protect cells more effectively than red wine, green tea, black tea, or orange juice

Risks

• May raise blood pressure in hypertensive individuals
• Can cause insomnia, anxiety, or jitteriness
• May worsen premenstrual syndrome in some women
• Can reduce fertility in women trying to conceive
• Leads to heartburn or indigestion
• Increases osteoporosis risk in postmenopausal women
• Raises homocysteine levels, potentially increasing coronary heart disease risk

Frequently Asked Questions

How many cups of coffee per day were linked to lower mortality in the study?

Drinking 2–6 cups of coffee per day was associated with lower mortality. Men in that range had a 10% lower risk of death, and women had a 15% lower risk compared to non-coffee drinkers. This applied to both caffeinated and decaffeinated coffee.

Does the type of coffee—caffeinated or decaf—matter for these health benefits?

No. The study found similar reductions in death risk for people who drank caffeinated or decaffeinated coffee, suggesting that factors other than caffeine may contribute to the observed benefits.

What are the main health risks associated with coffee consumption?

Potential risks include insomnia, anxiety, acid reflux, high blood pressure, heart rhythm issues, and elevated cholesterol (mainly from unfiltered coffee). Pregnant individuals should limit intake, and some conditions like osteoporosis or PMS may be worsened by coffee.

Is there evidence coffee reduces cancer risk?

The study found only a modest possible reduction in overall cancer risk, with about a 3% lower risk of certain cancers per cup per day. These included bladder, breast, colorectal, endometrial, esophageal, liver, leukemia, pancreatic, and prostate cancers.

How much caffeine is safe for most adults?

Up to 1,000 mg of caffeine per day—approximately 10 cups of coffee—is considered safe for most healthy adults. Pregnant individuals should limit intake to under 200 mg per day.

Recommended FrontStreet Coffee Beans for Coffee Lovers

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