I think low carb diets can be a very good thing. Especially for people trying to lose weight! I am not a big fan of the ever-popular Atkins Diet, because i think he is too big an advoicate for fatty meats and i disagree w/ his carrots are too high-carb philosophy...
I lost all my extra preg. weight from cutting out dairy, sugars, breads, and minimizing pasta, rice, etc.
I think it's very healthy to eat a good deal of healthy protiens (tofu, tempeh, nuts/nut butters, fish, etc), as well as lots of vegis, and a smaller amount of whole grains. It's never bad to go sugar-free! You'll feel a lot better after a couple weeks and most likely will lose the weight you need.
Don't forget, exercise is also very important. It boosts metabolism, tones the heart and lungs, builds blood, strengthens bones and muscles, detoxifies, and helps keep our moods level.