Persons Claiming to be Low-Carbing:

US -- 35 Million (14% of the Population)
Britain* -- 3 Million (5% of the Population)

http://forum.lowcarber.org/showthre...ight=35+Million

http://forum.lowcarber.org/showthread.php?t=134405

I don't have any info on other countries, but I'd guess they're number of Atkins Dieters is lower than Britain. *British Stats reflect only those doing Atkins.