When new runners first come to Charm City Run, they’re often surprised to see the racks and racks of brightly colored packets of carbohydrate-rich “goo,” bars and jelly beans in flavors ranging from chocolate to watermelon to cucumber; wafers and cookies; fizzy tablets; and pre-, post- and during-run drinks. It’s no surprise that one of the most common questions I get from runners these days is whether and when to consume this specialized runner nutrition.