Unsweetened coffee linked to lower cardiovascular disease risk, study finds

The sharpest finding in the new coffee data was not that coffee helped, but that the apparent benefit showed up only when the cup stayed unsweetened. In a study published in Nutrition, Metabolism and Cardiovascular Diseases, researchers using UK Biobank data found that sugar-sweetened coffee and artificially sweetened coffee showed no significant link to lower cardiovascular disease risk.

The analysis covered 173,614 participants, and about three-quarters of them drank coffee. Unsweetened coffee was the most common pattern, followed by sugar-sweetened coffee and artificially sweetened coffee. The lowest cardiovascular risk landed at 2 to 3 cups a day of unsweetened coffee, where the hazard ratio was 0.85 with a 95 percent confidence interval of 0.81 to 0.90, a result that translates to about a 15 percent lower risk versus no coffee. The relationship was U-shaped, meaning the signal was weaker at lower and higher intakes.

That pattern did not stop at one diagnosis. The protective association for unsweetened coffee held across major cardiovascular subtypes, including coronary artery disease, stroke, heart failure and atrial fibrillation. The effect was also reported as independent of genetic predisposition, which makes the result harder to dismiss as a quirk of one subgroup or one inherited risk profile.

For coffee drinkers, the practical takeaway is simple: what you add matters. The study lines up with earlier UK Biobank work that linked moderate coffee consumption with better cardiovascular or cardiometabolic outcomes overall, but this paper sharpens the point by separating black coffee from the versions that carry sugar or sweeteners. It also fits a broader debate over artificial sweeteners, where other studies have raised questions about cardiovascular risk.

That makes this more than a health headline. It is a reminder that coffee’s reputation rises or falls not just with the bean, the roast or the brew method, but with the finish in the cup. If the goal is to keep the cardiovascular signal looking strongest, this study points straight to the unsweetened pour.