Off my diet

I've noticed over the past year that I tend to go off my diet in small episodes of time. Usually I go off on a Friday, associated with the end of the week and wanting to go out to a restaurant - Indian food or Thai food, which have many dishes that contain a good deal of bad carbs, sugar and fat. Once I'm off the wagon, so to speak, it's hard to get back on. For example, last night I went to an Indian restaurant, had a beer with my already carb and fat-loaded dish, and then a class of wine when I got home. Today, being that it's Saturday, I'm heading to a blues festival in town that will have the typical temptations of ribs and beer. My one consolation is that it hasn't been an all-out binge, and that in the past I have had small deviations from my diet without hugely negative results.