From what I've heard, not sure that its accurate, is that low-carb diets are very effective for quick weight loss. But as soon as you incorporate carbs back in, you'll blow up like a balloon. Or at least back to your regular fat state.
Low carbing is quite complex. You would really have to read a book on how to lose weight doing this method as there are 3 steps to follow ; 1,2 and 3. You work your way up gradually to a moderate carb plan which does include plenty of vegetables and whole grains.
There are also vegetarian low carb plans which do work if you need to lose weight.