I LOVE Schwarzbein and it works well for me--I feel great, my skin looks 10 years younger. At this time I am doing Atkins because I would like to lose weight a bit faster--for me Schwarzbein works great for maintenance but it is a bit slow on weight loss. I have been using SP for about a month and physically I feel great but I haven't lost much. In addition, I just got blood work done and want to see what Atkins does to my triglycerides and cholesterol (Yup, that's me--"Nan the Amazing Human Experiment!"). My Dr, God bless his careful lil heart, is pretty much "American Heart Assn/ADA" all the way. He literally told me, "Anything that tastes really good should probably be avoided--cheese, red meat, eggs..." He is pushing for cholesterol medicine, although my cholesterol is only slightly above normal. My feeling is, he reminded me I need to lose weight (which I do) so I shall do so using a plan that works for me. Low carb works FAR better than low cal.