pretty much covered but just wanted to add, any excess calories of anything will get stored, but lets say im on a bulk and Im taking in 500calories xtra, the difference btwn whole grain products and refined products is that a larger ratio of whole grain products will get stored as muscle rather than fat, if you are on at a defecit know matter what you eat it will not get stored as fat the more refined products you eat will cause a greater loss of lean muscle mass.