A question for those who have used low-carb diets?

I lost 30 pounds on Atkins in about two months and then gained back 10 when I went off of it. However, I have kept the 20 pounds off for over five years, even though I don't follow that diet anymore. Maintaining my weight is a daily struggle, and there is no way I could ever go back on Atkins. The thought of it makes me sick now. I keep my weight down by trying not to overeat and exercising and being active whenever I can. Whenever I gain a few pounds, I immediately cut out snacking and sugar and exercise until those few pounds are gone. Like I said, it's a never-ending battle, but it beats being fat.