I first tried Atkins about two and a half years ago and after the first day I was so sick (withdrawal from sugar--so sad) that I quit the diet. When I tried again a few months ago I did some more research and realized that was actually a normal response. I hung in there and, after three days or so, I felt 400% better! But those three days I felt like the walking dead--headaches, lightheaded, nauseous, etc. Hang in there--it DEFINITELY gets better!