I definitely think that non-over weight people can do atkins. I'm am definitely not over weight and once I hit my goal, a person couldn't pay to eat highcarb things. Although I began Atkins at 173, I was still border line overweight (I'm 5'9.5" and have a curvy and wide body). I'm 21 and my mom and I lost about the same rate, so although age plays a factor, I think it's how much you weigh to how much you want to lose. For example, my last 15 lbs are not coming off like the first 15.

Good Luck and let us know how induction goes,
Erin