i don't wholely agree with "gh gut" terminology, when you eat more, your intestines grow, you don't need HGH for that to happen.
to hold muscle you need to eat alot, hence you gotta shovel alot of food in... seriously its normal in most cases, only those that fully starve themselves for months and months while jacked to get the vacuum look. not healthy, and not sustainable.
edit: over 10yrs of shoveling food in your stomach and bodybuilding will give you some "GH Gut" like effects. if your doing it seriously.