I think that because this is a slow weight loss as opposed to a crash diet your skin will probably shrink with you or soon afterwards. Make sure you exercise regularly and that should help to. I've seen people who lose really fast and they sag, but I haven't heard of any people on Atkins with that complaint. Age is a factor too - skin looses elasticity as we get older, so more exercise is recommended. I've seen pictures of surgery to correct this and it's not a pretty sight, so keep up the toning and you should be fine.