Fun fact: The bit about skinny people being able to eat more is actually true. It's called the "Belt of Fat" theory, and it's basically due to the fact that while the stomach and skin are able to stretch and expand, fat is not, so fat people are actually not able to fit as much into their stomach at one time. Additional fun fact: the guy that first came up with the theory and started studying it was a professional eater named Edward Krachie.