For a while I've wondered if I should eat a little sugar or a piece of bread occasionally just to keep up my resistance, so to speak. It's all well and good to eat clean and primal, but I don't want to get stuck in a fast-food hell where I can't have anything at all. I can't IF for days on end either.
5'0" female, 44 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 111 on sugar cheat. Currently fighting off sugar/candy cravings with bulletproof cocoa and a little rice.
I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I advocate a two-month strict adjustment for newbies. But everybody is different and should tweak Primal to their own needs.