Gotta love google! here it is!
A recent study presented to the American College of Sports Medicine reveals that low fat chocolate milk is an effective carbohydrate and fluid replacement recovery drink for hard training athletes.
Nancy Clark, MS, registered dietitian, a consultant to the Boston Celtics and the author of Nancy Clark's Sports Nutrition Guidebook says chocolate milk has a perfect balance of nutrients essential for an athlete's recovery, including high quality protein, carbs, calcium, vitamin D, potassium and riboflavin. Each nutrient serves a specific function in recovery for an athlete.
here's the link if you want to whole article:
http://www.stackmag.com/TheIssue/ArticleDraw.aspx?CID=2041