I am doing something similar: S&S 3-4 days a week, 18-20 hour fast 5-6 days a week (eating only from 3 or 4 pm to 7-8 pm), 24 hours without restrictions on the weekend. During the week I eat low-glycemic - avoid bread/flour and sugar (except 2-3 pieces of raw fruit a week, not counting "Faturday"). I have completed 3 months of it and am down 25 pounds and from ~30% body fat to 21%. Curious - do you train on the fasted days? If so, do you find your energy/strength varies whether fed or fasted? My energy sucks if I don't eat before training (I break my fast usually with nuts in the afternoon, dinner at 5-5:30, then train at 7 with a second helping of dinner after training). If for some reason I put off dinner and train relatively fasted, my strength is shot comparatively.