You could call it 'mixing plans,' or you could call it one plan with some exceptions here and there. In general, if you're being fairly consistent and only having alcohol/pasta/fruit once in a while, you'll probably still lose weight - at least until you're near a healthy weight. You'll acheive sufficient insulin control.

The tough part comes when you really want to tone up and get that last 10-20 lbs off. That's where I am right now. I cheat 'every now and then', and guess what? There's no way I'll ever get that weight off unless I really turn the screws to myself and be strict.

So I'd say it's okay to break the plan every now and then (even wine on the weekends). Mixing plans may work, but not nearly as well as sticking to one.