When it comes to chocolate, the darker (more cocoa content) the better. Dark chocolate contains a load of fibre, iron, magnesium, copper and manganese. Dark chocolate also contains a lot of antioxidants. In fact, studies have shown that dark chocolate with high cocoa content scored higher in antioxidants than blueberries and acai berries. Studies have also shown that dark chocolate with at least 70% cocoa content can help improve blood flow, lower blood pressure, decrease the chance of heart disease, and improve brain function.