I always used a dense whole wheat bread, which is suggested in the book if you can't find protein bread. I would find the thinnest slices possible. I tried the bread recipe once, but I thought it tasted pretty gross. Too heavy on the soybean flour.
When I go on Scarsdale, which I do now and then if a few pounds creep up, I use a half cup of Greek yogurt instead of cottage cheese for the optional lunch. That, with some sliced fruit, Splenda and nuts, works well for me. I always liked the breakfasts and dinners, but the lunches were pretty ho-hum. I used the substitute lunch a lot.