I've been on a similer diet to atkins, except its got carb-ups on the weekends. This halts muscle loss pretty good and gives you energy. I chose it over normal atkins because I've been lifting seriously for the last two years and I did'nt want to loose my hard-earned muscle. Check out these forums, very informative.

http://forum.bodybuilding.com/forumd...php?forumid=61