Are you speaking about South Beach? I'm not sure if you are...
Anyway, I found for me, the longer I went without the sugar-y, flour-y, refined carb-y foods, the less and less I wanted them. And there were NO "off program" days to be had. So if that's what you mean by P1, to eliminate those foods, yes *I'd* go back there - and never, ever leave. It's. Just. Not. Worth. It.