I've done this twice in the 8 weeks that I've been on CD. The first time for my birthday, the second for a friends birthday.
I really struggled before the first time, whether to do it or not and in the end I decided that I would go out and have a nice meal and I wouldn't beat myself up about it, and that I would deal with the consequences as they arose.
I didn't put on weight from it, but my losses were not as great as they could have been. And the following couple of days I was incredibly hungry. I think that was the hardest bit, getting back onto CD without giving into temptation, but I had to put up with it, that was all part of the compromise. I wasn't going to let a night off be anything more than just one night off!
But interestingly enough, I have found that my attitute to the food I ate was different. Like, one of the 'night's off' I went to Wagamamas and had my favourite, the Chicken Katsu Curry. And I ate the chicken and some of the rice with the sauce, but when I got to the big pile of rice that was still left on my plate without sauce I didn't want to eat it. I knew that I didn't particularly like rice without anything on it, and that it's just empty carbs. But before I wouldn't have even thought about it, I would have eaten it because it was on my plate.
But anyway, I'm not suggesting that having a night off, or a day off is a good idea. You might put on weight, you will find it hard to get back on the diet again afterwards and you will probably feel really guilty afterwards. But if you do it, as I did, make sure that you set your boundaries and only take the day, or the evening or whatever you decide, be prepared to deal with the difficult days to follow, and make sure you enjoy your birthday
Dee x