I agree it's drug related. Maybe the big eating has something to do with it, but not the sole cause of the GH gut. I'd say of anything, it's the insulin. GH was around, though probably not used in great amounts like today. But insulin, nobody touched that till Milos introduced it, and Lee Haney was long gone at that point. But Haney was the big thing in his day till Dorian came along. At one time, though, Dorian was a house and had a small waist too (think '93).
So, I'd say insulin is the biggest contributing factor, but also the GH, and big eating as well (maybe I should say "bigger" eating since the guys today do eat more to some degree).