I generally think I have bad posture and it really has little or nothing to do with eating. I'll sit sometimes but because I am always on the move I'll be standing or maybe crouching on the counter while I grab a bite. When I much younger I used to joke that I wanted bigger calves so standing eating would send the food right down to my calves.
Standing or crouching on the counter? I now have this really weird image in my mind...