The people who knock the Atkins Diet never seem to see past the first two weeks of it, which is called the induction phase. After the first two weeks of extremely low carbs, you start to ramp the carbs up again slowly. As to never coming off the diet? Well, as you ramp up carbs you move to a more healthy eating lifestyle, so I don’t think the phrase “never come off” really applies.
When I did Atkins, I felt immensely better and my blood lipids improved dramatically. I never lost any body fat though. Since then I discovered some additional metabolic problems that Atkins doesn’t address,so I don’t think it was the diet’s fault. The fact that I felt so much better gives the diet my blessings. (Plus, I don’t think anybody ever died doing Atkins properly.)
The time I did lose fat was when I was lifting heavily and eating lots of good protein. It seemed the more I ate (lo-carb of course) the more fat I lost. I haven’t figured that one out yet.