Hi Maynie - sorry for the delayed reply. I've not been on for a while. I found that on South Beach I ended up with really bad stomach problems (I was in agony when I used to eat, walking the floors literally at night sometimes) and had to go on medication for gastritis. I believe this was because I was too restrictive, and when I tried to eat "normally" again, my system couldn't handle it! I also had problems with headaches, poor skin and hair loss at times, although again I am still glad I did it because I'd have been a lot worse off at nearly 20 stone. I just don't think it's necessarily healthy to cut carbs to the extreme forever but if it's the difference between being morbidly obese and a bit restrictive it has to be the latter if that works best.
Hope you're well and all is going good on the diet front x