I decided over Christmas this year to eat what I wanted, as long as it was keto, or at least not entirely anti-keto. I (over) indulged in nuts, I made a batch of keto cookies that only I ate, and had some pretty big helpings of keto cheesecake. My brother even made a rice stuffing for me. Now I know that’s not keto, and I didn’t have much, but I wouldn’t have touched the bread stuffing with a barge pole, so it was kinda nice. I didn’t gain much, and really the worst of the gain came afterwards when I was trying to get back on track. That was a bit harder than I had bargained for.
I’m so glad that you were able to get through without any weight gain at all!! That’s a feat! I got through Halloween this year without once, for the first time in my life, succumbing to those stupid little chocolate bars that aren’t even really that good. That was my big success of 2017. 
So, I’ve been doing strictly ZC since Sunday and I have noticed a few things. First, I’ve noticed that my ketones seem to be even lower than normal, in the 0.2, 0.3 range, which has been a surprise. My resting heart rate has dropped a bit too, which could be both good and bad as I have thyroid problems, and I am experiencing a little bit of inflammation, e.g. some body pain. I’m surprised by the ketones, but maybe I’m not getting enough fat? Veggies were always a really good vehicle for my fats. And I’m wondering if now I’m eating too much protein in order to feel satiated. I feel like giving in already, but I haven’t even given it a week! LOL! Do you have any advice?