Coffee, the drink millions of men reach for out of habit, may also be quietly protecting their hearts and their sex lives.
Quick Take
- A landmark study of over 45,000 men found no rise in heart disease risk from regular coffee drinking.
- Research in the journal PLOS ONE linked two to three cups a day to lower odds of erectile dysfunction.
- Not every study agrees, and some meta-analyses found no clear connection either way.
- Doctors say moderate coffee intake still fits within a heart-healthy lifestyle for most men.
The Landmark Study That Calmed Heart Fears
For decades, doctors worried coffee might strain the heart. A major study published in the New England Journal of Medicine (NEJM) tracked 45,589 men ages 40 to 75 for more than 70,000 person-years. The result surprised many. Men who drank four or more cups a day showed no meaningful jump in cardiovascular disease risk. Researchers concluded that caffeinated coffee, as consumed by American men, “causes no substantial increase in the risk of coronary heart disease or stroke”.
That finding did not stand alone. A separate large study published in the journal Circulation looked at both men and women and reached a similar conclusion. It found no harmful link between coffee and coronary heart disease, even when researchers accounted for caffeine intake, decaffeinated coffee, and tea drinking. A more recent review of the science backs this up further, stating that coffee “is not detrimental to cardiovascular health” and may even help reduce risk in some cases.
A Surprising Link to Erectile Function
The bigger headline-grabber involves a part of men’s health rarely discussed at the coffee shop. A study published in PLOS ONE examined a large, nationally representative sample of American men and found that caffeine intake was tied to a lower chance of reporting erectile dysfunction. The sweet spot appeared to be caffeine equal to about two to three cups of coffee daily, roughly 170 to 375 milligrams. Forbes covered the finding at the time, noting the connection between caffeine and improved blood flow, since erectile health is closely tied to circulation.
The theory behind this link makes physical sense. Caffeine is known to relax smooth muscle tissue and support blood vessel function, both of which play a role in erectile response. Researchers behind the PLOS ONE study pointed to this mechanism as a possible explanation for why moderate caffeine drinkers reported fewer problems than men who drank little or no coffee at all.
Why The Science Isn’t Perfectly Uniform
Not every study lines up neatly behind that conclusion, and a straight look at the evidence should say so. A meta-analysis pooling four cohort studies covering more than 51,000 men found no significant relationship between coffee consumption and erectile dysfunction risk. Another large observational study reached the same neutral result, finding no association, positive or negative, between coffee intake and erectile problems. The Sexual Medicine Society of North America notes there simply is not yet enough research to confirm the effect either way.
Heart disease research shows a similar mixed pattern depending on how the data gets sliced. One meta-analysis found coffee drinking was tied to a higher relative risk of coronary heart disease specifically among men, even as the same analysis found a lower risk trend in women. That kind of split result is common in nutrition science, where dose, brewing method, and individual health history all shape outcomes differently from person to person.
What This Means for the Average Cup
Taken together, the weight of the evidence leans favorable for men who enjoy coffee in moderation. The largest and longest-running heart studies show no red flags at typical intake levels, and the sexual health research, while mixed, includes real signals pointing toward benefit rather than harm. For most men, two to three cups a day appears to sit in a safe and possibly helpful range, based on decades of data rather than a single headline-chasing study.
Sources:
mindbodygreen.com, forbes.com, pubmed.ncbi.nlm.nih.gov, pmc.ncbi.nlm.nih.gov, sciencedaily.com
