TMI, but I've experienced similar, after a couple high-sugar snacky cheat days. Except that I believe the 5 pounds is *ahem* both BM's and water weight. My body seems to like to retain water until the BM's, and then release the water.
Originally Posted by otzi
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. Current weight: skinny-fat 106 lbs. Resetting with the 21-day challenge.
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 aim for 80-90 g carb/day and advocate a two-month strict adjustment for newbies. But everybody is different and other need to tweak Primal to their own needs.