I also went to the movies with my son on my first weekend of Keto. I love movie theater popcorn! What helped me was focus and knowing it was going to only be 2 hours, I looked up the nutrition facts just to see if there was any quantity that I could have (boo! no way!), armed with that what I did was I smelled my son's popcorn. Yes, you read that right. I took a huge whiff when we sat down. It smelled so good, but just kept remembering the nutrition. Also, I bought a med-large diet soda (which some would poo-poo), and sipped on that during the movie.

Not sure if that helps, but good luck.

Go to dinner first. Eat very well. Go to the theater very full. Order a large diet drink.

I'm with you on this one. Movie theater popcorn with the faux-butter is pretty much my only kryptonite, for some reason. I won't eat popcorn in any other context. At one point, I remember seeing awful movies just so I could have so popcorn. That's when you know you have problems!

Just know that a popcorn splurge will knock you out of ketosis for a little bit. According to my blood ketone meter, it took me a full five days, with or without exercise, to get back above 0.5 mM/L. I also gained some water weight that was shed about 4 or 5 days after, as well.

The other strategies noted above are very good in terms of tilting the odds in your favor of eating keto in a tough situation, but if you give in, don't beat yourself up, just be patient and jump back on the wagon as quickly as possible.

Kale chips!

Oh god...kale chips..I found out about them here on MFP and they are now the favorite veggie in the house. season them bad boys with some old bay and they are just too good.

Last time I went to the movies I had a bag of macademia nuts and a bottle of mineral water with me.