Just creeping in because the thread caught my eye:
I can't speak to Atkins but I've tried another high fat low carb diet, and after a euphoric first week, I spent the next two no more than 3 feet from the bathroom. I might as well just have tipped the food straight down.
I'm now doing a low fat low carb (it's the French one beginning with D, I'm not sure if I'm supposed to mention other diets on a particular diet's board). 13lbs in 4 weeks - and I can leave home without fear!
I've done 4 weeks of D. and 0 weeks of Atkins, so you can see I can't offer a professional opinion, I can just say how much better it works for me.
The weird thing is that, although I had my GB out 16 years ago, I adore fat, it's the best bit of any meat: pork chops, pork crackling, roast lamb ......drooool; when I'm not low carbing, I have absolutely no problem with eating fat, it's only when I cut the carbs out that things go haywire.