I suffer of Crohn's disease, which, as you may know, is a chornic inflammation of digestive tract. Few years back I went on a diet very similar to SBD - I only ate fruits, vegetable, eggs, nuts and yoghurts. It did wonders to my health. And that's also the reason I've now chosen to follow SBD, to both help my health, and lose some weight. Done properly, it's an awesome, super healthy way of eating, and it's sustainable for life.
I'm still on phase 1,5 (fruits, no grains) and I plan to stay on it for a long, long time. But that's just me, with my condition.
My milestones: 105 kg (my weight before the last pregnancy); 95 kg (my weight before I got pregnant for the first time 6 years ago); 90 kg (no longer obese); 85 kg (the lowest weight I ever had as an adult); 75 kg (normal weight - is that even possible for me?).