If I'm at a restaurant looking at the menu it's because I'm doing something out of the ordinary. Maybe I'm on holiday, or I'm treating myself (or someone else), or celebrating. In any case I don't really care about calories, I'm there to enjoy myself. I'm not going to not order the meal I want because it's a few hundred calories more than the celery salad.

The rest of the time I eat healthily enough that one night off probably isn't going to harm me.