When I fattened mine up, the point of no return was more about his lack of willpower. Never very strong, at one point he insisted he wasn't fat and so I put him through a day with the amount of food he would have consumed nearly a year ago. By the evening we were in a Souther restaurant where he gorged on two substantial appetizers, two entrees and went out for dessert.
So it's more a frame of mind than a physical point - though they can be intertwined.
7 years
