I used to hate carrots. As in, they actually made me sick as a kid. My folks eventually stopped pur??e-ing carrots and hiding them in soups and stews once they noticed the projectile vomiting connection. Even the smell of them made me feel like barfing. Now, I don't know exactly when or how it happened, but sometime in the last few years I started craving the bloody things. Can't get enough of them now. Same with olives and red wine, two other things I used to detest. I still hate both almonds and marzipan but now you've posed the question I'm strangely tempted to try eating marzipan for a month to see if I can change my opinion of it.
You're probably right about not loading up on crap, it's just the easier option sometimes. And I do tend to feel that if your basic diet is good, some rubbish here and there is fairly harmless. But if you don't want to eat crap, fair enough. Just makes your task slightly harder, that's all.
In a way, your expectation of naturally developing a bigger appetite and wondering why it's not happening is the exact opposite, yet broadly just the same as all the folk who start running and wonder why they're not losing any weight!