I'm another nay-sayer on the cheat days for the sake of satisfying cravings, which really only lasts for the duration that you're sticking it in your cake hole.
If you just stick to plan and tell yourself 'no', your inner two-year-old will have a meltdown and you'll be sad and angry for a little while. You'll feel sorry for yourself. But two-year-olds have no attention span, and you'll forget about it a short time later and just get on with life as usual.
If, OTOH, you go for that cheat... YAY, party in your mouth for 15 minutes, but what happens after that? If you're anything like me, and especially because you've been VLC for a long time:
- you'll want to fall asleep. Fine if it's bed time, not so great if you're at work.
- If it's bed time and you just go to sleep, you'll wake up DYING of thirst at 2:00 am and just have a crappy sleep overall.
- Regardless of time: you'll be bloated as heck.
- Ew... acid reflux.
- You'll still be DYING of thirst. Remember that 5-10 lbs that came off when you first started induction? That was water weight shed from your glycogen stores being burned off. Now, you've just replenished a ton of glycogen and your body needs that water back. So you're thirsty... and there's not enough room for the water. You'll wish you could hook yourself up to an IV.
- You'll wake up the next day determined to get back to business, but you're starving-hungry. Like, could-hold-up-a-7-11 hungry. And it can be like going through induction flu again.
So, is the subsequent misery worth a day of "carbing up"?
Nope. Not for me. Not that I haven't done it anyway, but I always regret it. So I've avoided it 1000x more often that I've actually done it.
I've seen your posts before, but I don't recall your age. I didn't consider any foods poisonous until I did a gluten-free challenge and saw health problems disappear that I never would have thought were diet-related. One of the deal-breaker symptoms that disappeared was the emerging arthritis in my hands. That is permanent damage. There's no healing it - all you can hope to do is slow it down. I'm 40, so my 20 or 30 free years of eating whatever-crap has expired. I mention that because you mentioned donuts. I make donuts for a living. I got this job after I went gluten-free. I have not cheated ONCE and it's not even a consideration for me. The crap I make is completely off my radar.
Another point that's been mentioned: almost anything you miss can have a substitute. No, nothing will taste like a Krispy Creme or Pizza Hut, but... this is something that keeps me on plan: I keep ingredients on hand to make slightly-naughty-but-still-on-plan treats like LC cookies or a LC pizza, and I'm generally too lazy. Heh. Point is, if I'm craving something badly enough, I can make the LC version. If not? Well, the craving can't be that bad, can it?
I guess this wouldn't work for people who love baking, but like I said, I'm harnessing my laziness here and using it to my advantage.
I also second the idea of adopting certain higher-carb "safe" foods if you feel it's beneficial to your metabolism. I can handle a serving of certain higher-carb foods that don't send me into that tailspin. That's fairly subjective and requires experimentation; hence the carb ladder. Not sure why you're resistant to it...
Best of luck, whatever you decide.
PS - pardon the novel.