By Wilton Jackson Metcalf: “I eat one meal a day, drink one coffee and eat like three or four bags of candy.” DK Metcalf is a specimen of a human being. As one of the NFL’s most explosive young wide receivers, one would think the diet for the Seahawks’ receiver would be one filled with all the healthiest items in a grocery store. As it turns out, Metcalf’s diet is simple and one that includes a ton of sweets. The Seattle star spoke with NBA Hall of Famer Kevin Garnett on his KG Certified podcast and discussed his diet with the 15-time All-Star. Metcalf said he is probably not the one to discus…