I have to agree that the only valid point is the first one. The other points would be negligible at best and certainly not affect a high level natural bodybuilder. Body builders eat often but not such obscene amounts of food at a time that would make their stomachs protrude chronically. Heavy lifting also just doesn’t make your stomach stick out like these guys either. Maybe genetics could play a roll but I really doubt that too, particularly with the pros. Make no mistake at all, bodybuilders with stomachs like this are on or were HGH and/or insulin injections,.