I had a very heavy cat before she died in March. Not due to her weight. But she never had the opportunity to steal other food, it was out of her attainable reach. She was just heavy metabolically. (We have 4 other cats all normal weight. So it wasn't anything we were doing.)
The orange cat had a lot of opportunity to steal food , he was smart and knew when his owner was getting ready to eat ,and got to the table first.