Which Is Better for Your Heart? Dark Chocolate Vs. Milk Chocolate

Chocolate is one of those wonderful foods that inspires joy from the first bite—and if you choose the right chocolate, it can also offer health perks. However, the type of chocolate you choose matters. If it’s dark chocolate vs. milk chocolate for your heart, for instance, there is a clear winner that delivers more benefits than the other.

Meet the experts: Kathleen Garcia-Benson, R.D.N., C.S.S.D., L.D., a registered dietitian with VNutrition; Diane Han, M.P.H., R.D.N., L.D., a registered dietitian nutritionist based in San Francisco and the founder of Woking Balance Wellness.

Here, dietitians explain the differences between dark chocolate and milk chocolate, including which you should make part of your healthy diet.

According to chocolatiers, the difference between dark chocolate and milk chocolate lies in three ingredients: cocoa, milk solids, and sugar. Milk chocolate has a lower cocoa content, usually between 20% and 40%, contains milk solids (which are responsible for the creamy texture), and tends to be higher in sugar. Dark chocolate has a cocoa content over 50%, does not contain milk solids, and is therefore lower in sugar than its milky cousin. These differences in ingredients translate to differences in the nutrition between the two types of chocolate.

Dark chocolate nutrition

According to the United States Department of Agriculture (USDA), one ounce of 70–85% cocoa dark chocolate contains:

• 170 calories
• 2 grams (g) of protein
• 12 g of fat
• 13 g of carbohydrates
• 7 g of sugar

Milk chocolate nutrition

Per the USDA, 1.3 ounces (the size of a small chocolate bar) of milk chocolate contains:

• 202 calories
• 2 g of protein
• 12 g of fat
• 22 g of carbohydrates
• 21 g of sugar

The health benefits of dark chocolate come from nutrients found in the cocoa. Therefore, the higher the cocoa content in your treat, the better. Choosing dark chocolate with at least 70% cocoa is going to deliver the most perks, said Kathleen Garcia-Benson, R.D.N., C.S.S.D., L.D., a registered dietitian with VNutrition.

So what exactly are those perks? “Dark chocolate tends to be rich in polyphenols like flavonoids, which support an anti-inflammatory environment,” explained Diane Han, M.P.H., R.D.N., L.D., a registered dietitian nutritionist based in San Francisco and the founder of Woking Balance Wellness. She added that these powerful plant compounds have been shown to support numerous bodily processes, including heart health, brain function, and blood sugar levels.

A 2024 review published in Nutrients found that people who consumed dark chocolate with over 70% cocoa content saw reductions in total cholesterol, LDL (bad) cholesterol, fasting blood glucose, and blood pressure, all of which serve to improve your heart health and lower your risk of developing a cardiovascular illness. Meanwhile, a separate study in Nutrients found that dark chocolate optimizes brain function to make difficult cognitive tasks easier to perform.

“Dark chocolate is a good source of minerals like magnesium, iron, and zinc,” noted Garcia-Benson. She added that some dark chocolate may also contain theobromine, which has been shown to enhance cognitive function and potentially display neuroprotective effects.

If you are sensitive to caffeine, Garcia-Benson said you may need to be a bit careful when eating dark chocolate, as some contains caffeine. Likewise, the combination of caffeine and theobromine may cause adverse effects in some people.

“Milk chocolate still provides small amounts of antioxidants and minerals, though much less than dark chocolate,” said Garcia-Benson. That’s because the cocoa content has been reduced and milk solids have been added to make the chocolate sweeter and more palatable. “Some brands with higher cocoa content closer to 40% and lower sugar can offer modest health benefits closer to dark chocolate,” Garcia-Benson said.

While the higher sugar content in milk chocolate is mostly a negative, it does make the chocolate more palatable for most people. Thus, if you’re really craving chocolate, you may be able to satisfy your sweet craving with just a square or two of milk chocolate. Dark chocolate is less sweet and more bitter, so it may not be as satisfying and send you back into the kitchen later in search of a different sweet fix.

The lower the cocoa content in the chocolate you choose, the fewer benefits it will contain. According to the Code of Federal Regulations, milk chocolate must have a minimum of 10% cocoa content, so bars that clock in right around this mark are unlikely to contain enough cocoa to offer significant health perks. And because of the higher sugar content, milk chocolate should be treated much more as an occasional indulgence than an everyday treat.

“Dark chocolate is usually the more nutrient-dense option because of its higher cocoa and lower sugar content,” said Garcia-Benson. However, both Han and Garcia-Benson cautioned that dark chocolate, like milk chocolate, is considered “calorie-dense,” or just a small serving is high in calories. “Moderation matters,” Garcia-Benson said. “For weight management, the key is portion control and overall dietary pattern.”

Dark chocolate delivers more antioxidants and beneficial nutrients than milk chocolate does—especially if you’re choosing dark chocolate that contains over 70% cocoa. Having a bit every now and then, or even a small serving every day, may support your heart health. Still, the calories and sugar in both types are worth being aware of. “Choosing chocolates that are low in added sugar and saturated fat, or opting for smaller portions, are both effective ways to make healthier choices,” said Han.