Dark chocolate and cocoa are delicious sources of antioxidants.

In fact, cocoa has been called a "super fruit," because it provides at least as much antioxidant activity as any other fruit, including blueberries and acai berries.

Dark chocolate contains flavanols, which may reduce the risk of heart disease by lowering blood pressure and keeping arteries healthy.

Somewhat surprisingly, chocolate can be part of a ketogenic diet. However, it's important to choose dark chocolate that contains a minimum of 70% cocoa solids, preferably more.

One ounce (28 grams) of unsweetened chocolate (100% cocoa) has 3 grams of net carbs. The same amount of 70–85% dark chocolate contains up to 10 grams of net carbs.