I should just add that I did SB without any sugars or starches whatsoever. I think SB does allow them in limited quantities (can't really remember) but I had just been told that my triglycerides were 380 so I threw myself into low carb with a vengeance! My triglycerides went down to 75 in two weeks. The amazing side-effect was that the cravings for sugar and starch disappeared, and it was THAT that made the plan sustainable for me. If I'd had even an allowed bite or two of anything sugary or starchy it would have kept me hungry and craving. Your way of achieving sustainability might be entirely different, but as Liz said "it's all good".