My 20% usually revolves around social gatherings or special occasions or ice cream in the summer. Even then I usually make the best choices I can. I'm more strict on grains then anything else because now grains actually make me feel sick (except white rice, not sure about corn havent had it in so long) as does too much fructose. When I had regularly scheduled weekend cheating it was incredibly detrimental not only to my weight loss but more importantly my Psyche. It just reminded me of my old ways and made changing so much harder. The longer I eat this way the less I want to eat that processed crap.
If its my birthday and I want something non-primal then I'll go for it.. or my wedding day.. and I had some flourless chocolate cake on my anniversary.. I had some crust-less sweet potato pie on thanksgiving. So really these are EXCEPTION to my general way of eating.. they are pretty rare. The other part of the 20% is going out to eat because that usually entails eating conventional meats and most of all crappy oils. I only go out to eat once a month.
You dont want your diet to cause too much stress in your life. I will tell you at first it IS an added stress, but the longer you do it the less stressful it is. Then once you are in the grove you'll get those moments where its not worth the trouble to go too crazy.... you just try and minimize the damage.
Primal since March 2011
Female/29 years old/5' 1"/130ish lbs