I was a bit nervous too. But fat seems to really suit me. I did low fat Weight Watchers etc etc. and had to pretty much eat nothing to lose weight, felt hungry and miserable. This just works for me, I feel I can eat a lot, with added fat, never hungry and either lose or maintain. Hope it will work for you too.
Starting Primal June 2012 at 148.5lbs, goal weight in November 2012.
Lowest weight 93lbs - too thin. Now up to around 101lbs and holding.
Primal, minus eggs, dairy and a myriad of other allergens.