Consuming dark chocolate might offer surprising health benefits, including lowering the risk of type 2 diabetes. A new observational study suggests that eating at least five small servings of dark chocolate weekly could reduce diabetes risk by 21%. Notably, the benefits increased with consumption, up to five servings. However, it’s essential to keep in mind that a “serving” is just 1 ounce, and the chocolate must be dark—not milk chocolate—to achieve these effects. In contrast, milk chocolate was associated with weight gain, a known contributor to type 2 diabetes.

The key difference lies in cacao, the primary ingredient in dark chocolate. Unlike milk chocolate, dark varieties have higher cacao content, providing more flavanols. Flavanols, found in cacao, are compounds with antioxidant properties that combat inflammation and oxidative stress—factors linked to diabetes and other chronic conditions. “Dark and milk chocolate have similar levels of sugar, fat, and calories, but dark chocolate’s higher cacao content makes all the difference,” explained Binkai Liu, the study’s lead author and a doctoral student at Harvard T.H. Chan School of Public Health.

Flavanols: the health-boosting compounds

Cacao is the raw, less-processed form of chocolate, harvested from the Theobroma cacao tree. It contains the highest flavanol levels, making dark chocolate a rich source of these bioactive compounds. According to Dr. Nestoras Mathioudakis of Johns Hopkins Medicine, flavanols may improve insulin sensitivity and reduce inflammation, as shown in small-scale human and animal studies. While this new research does not prove a cause-and-effect relationship, it highlights the potential benefits of flavanol-rich foods.

Diabetes: a Growing global challenge

Diabetes affects approximately 1 in 10 people in the United States, with 95% of cases being type 2 diabetes. Globally, the numbers are even more alarming. A recent study projected a rise in diabetes cases from 529 million in 2021 to 1.31 billion by 2050. Factors driving this surge include sedentary lifestyles, poor diets, and the widespread consumption of ultraprocessed foods. In fact, research shows that every 10% increase in ultraprocessed food intake raises diabetes risk by 17%.

Given chocolate’s reputation as a processed treat, could it realistically be recommended as a health aid? Dr. Mathioudakis is skeptical. “Chocolate is candy and contains sugar. I wouldn’t advise anyone to eat chocolate for better glucose control based on this study alone,” he said. Instead, he suggests alternatives like dark berries, apples, tea, and even red wine (in moderation) as sources of flavonoids.

The study’s insights and limitations

Published in The BMJ, the study analyzed data from three large, long-term studies involving over 111,000 participants who completed food questionnaires every four years over 25 years. Researchers found that consuming at least five 1-ounce servings of chocolate weekly—regardless of type—was linked to a 10% lower risk of type 2 diabetes. However, dark chocolate stood out, showing a 21% reduced risk without the weight gain associated with milk chocolate.

The study has limitations, as noted by the authors. Participants were predominantly older White adults, and chocolate consumption levels were relatively low. Furthermore, conflicting evidence exists. For example, a randomized trial of 21,000 people found that cocoa flavanols lowered mortality risk but did not reduce diabetes incidence.

Potential risks of dark chocolate

Dark chocolate is not without concerns. Recent studies reveal contamination with lead and cadmium, neurotoxic metals linked to cancer and other chronic diseases. These contaminants were particularly prevalent in organic dark chocolates, likely due to industrial pollution in cacao-growing regions.

The bottom line

For those who love chocolate, small dietary changes, like choosing dark over milk chocolate, could positively impact health. However, non-chocolate fans might be better off opting for fruits and vegetables rich in flavonoids. If you can’t resist chocolate, limit consumption to a few 1-ounce servings of dark chocolate per week. As Liu puts it, “Small choices, like choosing dark chocolate, can make a difference.”

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