You know, we forget that Primal doesn't cure everything. Many many Groks died from things we can cure today.
For the record, zinc gives me lower digestive problems. I have to avoid anything with enriched with zinc, and those zinc cold lozenges are BAD news.
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.