Several commercials depict physically fit athletes, actors, and hip-hop artists chugging brightly hued sports drinks and vitamin-fortified waters, but rarely does any commercial show a marathon runner or a basketball player slamming a glass of chocolate milk after a workout. And certainly no ad or commercial would deign to show sweaty, bulky football players dunking tea bags into teacups as a way to replenish themselves after a rigorous game. The implication is that only sports drinks and enhanc…