I lost over 80 lbs doing low gi, but then I kinda blew it when my dad's heart went out of sync and then he broke his hip and then he was in rehab and I was going back and forth for months and he almost died twice. I put all the weight back on and a little more. It works if you stick to it, but I dont think you can get the
nuances from the south beach book is why I suggested also reading low gi ...