Weeks 1-2 (Phase 1) COULD be keto if you want...they basically restrict all carbs and keep fat at a moderate level. Depends on how easily you get into keto and if you need the very high fat content like CKD. After that (Phase2) they bring back in some fruits and complex carbs. It's meant to be a lifestyle change. You start out strick to get the ball rolling and then gradually move towards something that you can live with indefinitely. Depends on what your goals are but I prefer CKD for quick BF loss. My "normal" diet is similar to South Beach's long-term plan anyway...mostly complex carbs, fruit, and veggies. I rarely if ever go for candy, ice cream, junk food, and processed carbs.