"We are a little bit surprised to see that effect size," says study author Dr. Qi Sun, an associate professor at Harvard T.H. Chan School of Public Health. Researchers analyzed data from about 192,000 adults who completed diet questionnaires over many years— including how much and what type of chocolate they consumed—as part of their participation in long-term health studies. The findings are published in The British Medical Journal.
"Vasodilation seems to be the mechanism for the lowering of blood pressure," Dr. JoAnn Manson told NPR in 2023. This lower blood pressure may help explain the reduction in heart disease risk.
People who ate milk chocolate, which has more sugar and less cocoa, had no reduction in diabetes risk. And, over the course of the study, milk chocolate eaters tended to gain weight, which contributes to the risk of diabetes.
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