Atkins states that you must take a suppliment when losing weight (induction, OWL and pre-maint) because all the water we drink washes many of the nutrients away. I take a multi and extra pottasium and extra Vit. C. I know that when I don't take my suppliments, I don't feel 100%.

The South Beach Diet is low fat/lower carb if I remember from the book - - it does not promote the stage of Ketosis as Atkins does. Ketosis flushes your fat and the fat you eat out of your system so it does not clog anything up in side of you. Thus the healthy blood workups that we get.