Atkins is okay if you're looking to lose a tonne of weight. However, zero carb style of dieting for many people is difficult to do and can impact muscular gains as carbs assist with the nitrogen balance in your system, which when cutting carbs is adjust significantly causing a loss in muscle fibers.
A better approach, IMHO, is take your lean body mass (your weight minus your body fat), multiply that by 12, and only eat that many calories a day consisting of 50% protein, 20% carbs, and 30% fat. That way you still get some carbs and fat in your system, but the decrease in those two with the high amount of protein will still allow for preserving your muscle mass while being on a caloric deficit. Then, throw in some strength training.
Others may feel different, but I've put that same split on athletes and soccer moms and it works.