My best diet ever is a CKD. Sun-FriPM is nothing but meat/fish/chicken and fish oil and water. Pretty much zero carbs during the week. Then Friday night is meat and white rice. Saturday I have more meat and rice for breakfast, but eat just about whatever I want for lunch and dinner. No sugar, but if I want some greasy pizza or something I'll have it. Sometimes If I really carb it up I'll fat fast on Sunday to get back into ketosis. One stick of butter cut into six pieces does the trick. I have one chunk for each meal. Yum!