I've never done Atkins, so I don't know what being in ketosis feels like. How does one know when one is there? I do know that after a couple of days into Phase 1 of SBD I started feeling light-headed, weak, difficulty concentrating, dizzy. By day 6 I could no longer continue phase 1 and moved into phase 2. After a couple of days adding carbs into my diet I felt so much better. So, were the symptoms I had ketosis? Not sure.

According to the book, one is not to go into ketosis. Of course, not knowing how to determine when one is in this situation, it's difficult for me to know.