Since I've stopped eating junk food altogether, I seem to enjoy looking at the junk food isle in the supermarket, mostly for nostalgic reasons?

Nah sounds normal, especially if you used to eat junk food quite often! :-)

Are you thinking, “That’s just not me anymore”?? Reminds me of a story by Wiayne Dyer about his Diet Coke addiction…
But I can relate because, as much as I loooveee Cheetohs I have given them up for now because I’m on a serious diet to lose 15 pounds and it gives me a real feeling of power to look at that junk and turn up my nose at it! Like, YOU HAVE NO POWER OVER ME !!I do so love Cheetohs though…

What @Earthgirl said.
It’s lost its power over you. You wonder why you were ever enticed by that sweetness/salty goodness? It looks cartoony and junky.