Personally, I don't like Atkins. From the research I've done, and the people I know who have done it, your body's shock to the diet results is a quick weight loss, but most gain it back. I think any time you alter your diet in such a manner, it's not healthy. IT's good for a quick weight loss, but not long term. Are you going to eat like that the rest of your life? If not, what do you htink will happen when you eat carbs again and put down the butter, cheese, and bacon?
Personally, I've had great success with Weight Watchers, and know many people who have also. Unlike a diet, it doesn't restrict what you eat, just how much you eat of it. You get a certain number of points for the day, based on calories, fiber, and fat content. The amount of points you get is determined by your weight. If you eat within your points, you will almost certainly lose weight. And the great thing is, you don't have to eat certain foods or eliminate others. It's not a diet, but a permanent change in eating habits.
For example, say you get 30 points for the day. Most vegetables are 0 points. So you can eat them all day. A slice of pizza is usually 6 points. So you can eat pizza, but if you eat 5 slices, you need to eat salad the rest of the day. You learn what to eat and what you want to stay away from. My thing was soda. Each can of soda has about 3 points. I could drink 5 a day, easily. I quickly realized that I didn't want to spend half of my daily points on beverages, so now I drink diet or water. Without the program, I wouldn't know how to compensate for the calories.
I've been on since May 5th (8 weeks), and have taken off 18 pounds. My goal is 2 pounds a week, and I'm right on target. Any faster of a weight loss, and I'm afraid it won't stay off. Slow and steady is my pace, and it'll stay off for good.