Fair play to ya, I don't know, I think my sugar level would drop and I'd be feeling like sh1t but you never know. I would need to do it on my days off work........I have decided to give this a go. I did 36hrs from tues tea time to thurs breaksfast. I chose 0 calories partially to see if I could do it partially to see how it affected my cycling. I commute 20 miles every day but I took it very easy (with the exception of one Strava Segement) It sounds to me to be very interesting. For this month I am choosing a Wednesday and I'm going to do Breakfast-Breakfast. As for this week I have had no adverse reactions and everything seems very positive.