This is a interesting subject with a variety of view points on the matter. I have a few points to add to this, but am not sure if I am right anyway I think foods high in fat, sugar, and sodium may help achieve a fuller vascular look is firstly free fatty acid levels in the presense of elevated glucose levles attenuate insulin secretion from pancreatic b cells, thus help pushing and storing glucose and binding it with extracellular water (as water intake has stopped) into muscles filling them out and helping you dry up. Secondly the intake of sodium few hours before a contest with the intake of a little fluid would help restore or blood volume thus making it easier to get vascular.