<human>:  What are the nutritional benefits of dark chocolate?
<bot>: Dark chocolate is an excellent source of antioxidants, minerals, and vitamins. It is also high in fiber and contains a host of beneficial nutrients, including iron, magnesium, potassium, copper, and manganese. Dark chocolate has also been linked to improved cardiovascular health and lower risk of some diseases. Additionally, dark chocolate contains a range of polyphenols that have anti-inflammatory benefits, as well as polyunsaturated fatty acids which are believed to have a positive effect on cognitive function.