You might also want to do a search on Atkins in this forum, because there has been a lot written about it and this question comes up a bit.
I've posted this before, but here goes again, I've done Atkins, had amazing results but found it really really tough to stick to, regained the weight plus more and got the taste for high-fat food which I previously didn't ever have. Which I believe strongly contributed to my current weight, previously, my weight was about 65/67kg, and although not ideal, it was nothing like I was when I started lipotrim - almost 85kg.
The only person I know who does Atkins as a lifestyle is a girl I used to share a house with who was an absolute exercise addict, swam about 5miles a day, pilates 3/4 times a week, and she had a fab figure but never ever looked well, her skin, hair and eyes looked liked they belonged to a woman twice her age.
The other woman I know who does it, also does a lot of exercise, but goes off and on it again and again, and I have to say, reading Cathy's post about gallstones, I think yo-yo dieting must be one of the most dangerous things to do to the body.