I didn't go on any strict, specific diet for the month of January, but I did stop eating my weight in chocolate candy…eventually. You know, after the candy ran out.
It was ridiculous how over the course of last year I transitioned from "no sugar at all" to "only tiny bits of pure maple syrup and whatnot" to "a little sugar is not really so bad and can't realistically be entirely avoided" to "eat all the sugar as fast as you can, before someone else gets it."
I did not cave on my no-gluten stance, so I wasn't eating cookies, cakes, pies, and all the other junk that was so readily available between Thanksgiving and New Year's—just chocolate and lots of it. Because of that, I never felt too awful, but my pants started fitting tighter, and I got both a pimple and a nasty canker sore. I haven't had either of those in so long that I sort of forgot they existed, so I'm hoping that writing it down will help me remember to stay out of Category IV—"eat all the sugar as fast as you can, before someone else gets it"—and keep closer to somewhere between Category II and Category III.
Because I do think Category II½—"go ahead and make Paleo cookies for your family once in a while, and don't be afraid to join in when everyone is having s'mores around the campfire, for heaven's sake"—is the sane and logical approach to sugar. It's just a slippery slope, is all.