While perusing bodybuilding videos on Youtube, I came across an eye-opening comment on one of the videos:
There are no hardgainers. There are only under-eaters.
Is this true? Are people who find it difficult to gain muscle mass just not eating enough? From a scientific standpoint, this seems true. The law of conservation of mass and energy would refute any claim of a person eating more calories than he/she expends, yet not being able to gain weight. Let's make this question easier: in the absense of any debilitating gastrointestinal diseases, is it possible to eat a lot and still be classified as a hardgainer?