We always keep our crystal cake plate filled with Dark Chocolate at the spa.  Check out this link for the 6 Health Benefits of Dark Chocolate. http://www.fitday.com/fitness-articles/nutrition/healthy-eating/6-health-benefits-of-dark-chocolate.html

Many people pass up the Dark Chocolate since their trying to watch their weight.  I think of it like a vitamin; one a day is all you need.