Column: 4 Reasons to Eat Dark Chocolate, Dietitians Say
A column published November 13, 2026 sets out four reasons to eat dark chocolate, citing dietitians and trials on blood vessels, blood pressure and blood sugar. Experts suggest up to an ounce a day, with at least 55 percent cocoa, and say nobody needs to force it down.
A column published November 13, 2026 sets out four reasons to eat dark chocolate daily, drawing on dietitians and clinical research into heart health and blood sugar. The message is a measured one: small portions, high cocoa content, and no obligation for people who dislike it.
Health experts have long told Americans to limit cookies, candies and packaged snacks. These foods are top sources of added sugars, which are linked to a higher risk of heart disease and Type 2 diabetes.
Dark chocolate gets different treatment. Dozens of studies over the years suggest it may offer benefits other desserts do not. Why is not entirely clear, though researchers have identified some potential reasons.
What makes it different
Dark chocolate is made from cocoa, which comes from cacao beans and is rich in plant compounds called polyphenols. These substances give plants their colors and flavors. They act as antioxidants and have shown anti-inflammatory properties.
"Chocolate has a special type of polyphenol called flavonoids," said Bethany M. Doerfler, a clinical research dietitian at the Northwestern Medicine Digestive Health Center. "The darker and purer the chocolate, the deeper the concentration of these polyphenolic compounds."
A serving also provides magnesium, a nutrient most Americans do not get enough of.
Heart and blood vessels
A meta-analysis published in 2020 pooled more than a dozen randomized trials involving 615 people. It found that regularly eating small amounts of dark chocolate protects and relaxes blood vessels, which is good for the heart.
A separate analysis in the Cochrane Database of Systematic Reviews covered dozens of trials. It concluded that flavanoid-rich chocolate and cocoa products could lower blood pressure by about 2 points in the short term. Flavonols can boost nitric oxide in blood vessels, allowing more blood to flow.
One large trial gave older adults a daily cocoa extract supplement for about 3½ years. They were 27 percent less likely to die of heart disease than those given a placebo. That was a secondary finding. The trial found no significant reduction in its main measure of cardiovascular events, including heart attacks and strokes.
Blood sugar
Many studies indicate that cocoa flavonoids can improve how the body responds to insulin and regulates blood sugar. Lab studies suggest they may protect the beta cells that make and release insulin from the pancreas. That may explain why people who eat dark chocolate show lower rates of Type 2 diabetes.
How much to eat
Doerfler tells her patients to eat dessert every day, because food can bring joy and pleasure. She encourages dark chocolate fans to eat up to an ounce daily and to look for at least 55 percent cocoa on the package.
"What makes dark chocolate a unique and rewarding dessert is that there really are some health benefits to it," she said.
Lisa Young, a dietitian and adjunct professor of nutrition at New York University, said people who dislike it should not feel obligated. Berries, beans and other plant foods supply plenty of polyphenols.
