This exact circumstance seems to be a main culprit for rampant fat-assery. Like you said, you have the established healthy concepts so you have a proper zero-point to return to when needed. I assume most fats don't. From shitty up-bringings or whatever current mental excuse, they've never had a truly healthy example to connect with. While ignorance may be usable as an immediate excuse; with the freedom of information access we have today, anyone who truly cares about their health will have no trouble finding any info on how to improve themselves. Those that make no effort are only being lazy and undisciplined.