Drinking Coffee Linked to Lower Prostate Cancer Risk

When it comes to reducing your risk of prostate cancer, you might wonder: could something as simple as your morning coffee habit make a difference? A major long-term study offers some clear numbers—and they’re not insignificant.

Yes, according to a 20-year Harvard study, men who drank six or more cups of coffee per day had a 20% lower risk of developing prostate cancer compared to non-coffee drinkers. For lethal prostate cancer—cancers that prove fatal or spread aggressively—that risk dropped by 60%. Even one to three cups daily lowered the risk of lethal prostate cancer by 30%.

The 20-Year Harvard Coffee and Prostate Cancer Study

As part of the Health Professionals Follow-Up Study conducted by Harvard University, researchers tracked 47,911 men over two decades. These participants regularly reported their coffee intake. The findings, published on May 17 in the Journal of the National Cancer Institute, mark the first study to directly link higher coffee consumption with a reduced risk of prostate cancer.

Coffee’s Protective Effect Against Lethal Forms

The most striking result was the dramatic reduction in risk for lethal prostate cancer. Men drinking six or more cups daily saw a 60% lower likelihood of developing deadly or metastatic prostate cancer. Even those consuming just one to three cups had a 30% lower risk of the most aggressive forms. Importantly, this protective effect applied equally whether the coffee was caffeinated or decaffeinated.

How the Study Worked

Over 20 years, 47,911 male health professionals reported their coffee consumption habits. Researchers then analyzed the data to identify correlations between coffee intake levels and diagnoses of both overall and lethal prostate cancer. Key figures include:

• 6+ cups/day: 20% lower risk of any prostate cancer
• 6+ cups/day: 60% lower risk of lethal prostate cancer
• 1–3 cups/day: 30% lower risk of lethal prostate cancer

The reduction in risk was observed regardless of whether participants drank regular or decaf coffee.

Why This Matters

While the study doesn’t prove causation, it adds to growing evidence that coffee—already recognized for its antioxidants—may offer significant health protections. Previous research has also connected coffee consumption with a lower risk of type 2 diabetes. The antioxidants in coffee are believed to contribute to these protective effects, though the exact mechanisms remain under investigation.

Frequently Asked Questions

How many cups of coffee reduce prostate cancer risk?

Drinking six or more cups of coffee per day was linked to a 20% lower risk of any prostate cancer and a 60% lower risk of lethal prostate cancer. Even one to three cups daily reduced the risk of lethal prostate cancer by 30%.

Does decaf coffee have the same benefit?

Yes. The study found that the reduced risk of prostate cancer applied to both caffeinated and decaffeinated coffee, indicating that caffeine is not the key factor in the protective effect.

What kind of prostate cancer is considered 'lethal'?

Lethal prostate cancer refers to cancers that either result in death or spread significantly throughout the body. The study showed a particularly strong risk reduction—60%—for these aggressive forms among heavy coffee drinkers.

How long did the study track participants?

The study followed 47,911 men for 20 years, during which time their coffee intake and cancer diagnoses were regularly recorded and analyzed.

Should I start drinking six cups of coffee a day?

The study does not recommend increasing coffee intake specifically to prevent cancer. However, the findings suggest that current coffee drinkers may be gaining unanticipated health benefits without added risk.

Recommended FrontStreet Beans for Coffee Lovers

FrontStreet Coffee’s Ethiopia Huakui offers bright, juicy notes of citrus and floral tones, perfect for those appreciating coffee’s antioxidant qualities. Their Yirgacheffe delivers a classic profile of berry and light spice, ideal alongside a healthy routine. For something richer, try the PWN Golden Mandheling with its deep caramel and nutty sweetness. All three are single-origin specialty coffees that highlight coffee’s diverse flavour potential. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.