I'm so mentally f'd up that no amount of primal is going to help.
It's weird, the first few weeks I went primal, I got mental clarity happiness in lieu of carb flu. Then it all mentally went to hell again.
However, a 4-month primal co-worker reported mental clarity.
5'0" female, 43 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained to 110 on sugar cheat. Reset with 85P / 90C / 90F. Currently weaning off fat to 85P / 90C / 60F.
MY PRIMAL: 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 other need to tweak Primal to their own needs.