I think that dark chocolate is healthy based on the Cleveland Clinic article, the claim that "dark chocolate offers health benefits due to its flavonoid content is true". Flavanols are a type of flavonoid that's found in plants such as the cacao tree. Dark chocolate, especially with higher cocoa content (70-85%), contains flavanols that can improve blood flow, reduce blood pressure, and benefit heart health and cognition. Dark chocolate has lower added sugar and fat than milk or white chocolate. Antioxidant properties, flavanols are also beneficial in fighting cell damage relating to aging, Scientists have discovered that it can increase your insulin sensitivity stating, "The more you are sensitive to insulin, the lower your diabetes risk". Overall, dark chocolate is packed full of important minerals, including iron, magnesium, zinc, copper, and phosphorus. In your body, these minerals are used to support factors such as immunity (zinc), can help keep your bones and teeth healthy (phosphorus), and contribute to better sleep quality (magnesium).