> A bad food is something that doesn't satiate you as it gives you calories and fat, so you need to do other work to force yourself to not overeat. Example: twinkies

OK, this is a reasonable first step. My point, really, is that even 'bad' foods can be part of a healthy diet, because health is determined by the overall diet.

Demonizing food leads to unhealthy psychological results in the form of the sin-guilt-redemption cycle, when what you really need to lose weight is a clear-headed appraisal of your current state and what you're capable of doing to reach your goal.