I do 22/3 so 22hours fasting and a 3 hour window for eating. I lose an average of 1/2 pound a day. (I'm on day 18)

I'm not hungry during the day so I eat between 5 and 8 pm. Other than that I have tea and diet coke. I put a tiny bit of cream (up to 80 calories a day - yeah I know I shouldn't be counting) in my tea, and the fat in that plus the caffeine (as in green tea) keeps me going all day long.

There is a long thread on IF in the challenges section that I just resurrected and there are lots of people only eating once a day there. Might want to check it out.