Drinking 6+ Cups of Coffee Lowers Prostate Cancer Risk

When studies link your daily habits to serious health risks, you want clear answers—not vague advice. For men concerned about prostate cancer, one daily habit has shown surprisingly protective effects: drinking coffee. But how much makes a difference? And does it really lower your risk of the deadliest forms?

Yes—according to a major Harvard study, men who drank six or more cups of coffee per day had nearly 20% lower risk of developing prostate cancer over two decades, and a 60% lower risk of fatal prostate cancer compared to non-coffee drinkers.

The 20-Year Harvard Coffee & Prostate Cancer Study

Scientists from Harvard University tracked 47,911 men over 20 years, regularly collecting data on their coffee consumption. The findings, published in The Journal of the National Cancer Institute, mark the first major evidence linking coffee intake with reduced prostate cancer risk.

Key results include:

• Men drinking 6+ cups daily had ~20% lower overall prostate cancer risk
• Same group showed a striking 60% reduction in fatal prostate cancer risk
• Even 1–3 cups daily correlated with 30% lower risk of fatal prostate cancer

Caffeinated or Decaf? Both Count

One question many coffee drinkers ask: does it matter if the coffee is caffeinated or decaffeinated? According to the research, it doesn’t. Both types of coffee were associated with reduced prostate cancer risk, meaning the protective effect likely comes from compounds other than caffeine.

How Coffee May Protect Against Prostate Cancer

While the study didn’t explore mechanisms directly, researchers note that coffee is a major dietary source of antioxidants. These compounds may help combat cellular damage and inflammation linked to cancer development. This aligns with other research showing coffee’s role in reducing risks of type 2 diabetes and other chronic conditions.

The study’s lead author, Professor Kathryn M. Wilson of Harvard’s School of Public Health, told The New York Times: “We’re not telling men to drink more coffee. But there’s growing evidence that those who do can feel more confident about their prostate health.”

Frequently Asked Questions

How many cups of coffee per day reduced prostate cancer risk in the study?

Men who drank six or more cups of coffee per day had nearly 20% lower overall prostate cancer risk over 20 years. Even one to three cups daily was linked to a 30% lower risk of fatal prostate cancer.

Does decaf coffee have the same protective effect?

Yes. The study found that both caffeinated and decaffeinated coffee were associated with lower prostate cancer risk, suggesting the benefit comes from non-caffeine compounds in coffee.

What type of prostate cancer risk was most affected?

The biggest impact was seen in fatal prostate cancer: men drinking six or more cups daily had 60% lower risk of deadly prostate cancer compared to non-drinkers.

How long was the study conducted?

The research followed 47,911 men over a period of 20 years, making it one of the longest and most comprehensive studies on coffee consumption and prostate cancer risk.

Why might coffee reduce prostate cancer risk?

Researchers suggest coffee’s high antioxidant content may help reduce cellular damage and inflammation. Coffee is also known to influence insulin and sex hormone levels, which could play a role in cancer development.

Recommended FrontStreet Beans for Coffee Lovers

For those enjoying multiple cups daily, try FrontStreet Coffee’s Ethiopia Humbera for its bright citrus and floral notes, or the Yirgacheffe for juicy berry tones with a clean finish. Both single origins offer complex flavour without bitterness—ideal for frequent brewing. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.