On my fast day, I had a light breakfast (bread from bakery) and salad for dinner (lots of greens, some small pieces of tuna like from cans). Have no way of nailing down calories yet so that’s something to look into in the coming weeks.
I must admit it felt fine during the day since I was drinking lots of water. It only became a little more difficult towards bedtime. Well, at least by most accounts, as the body remembers the experience the whole thing should get easier as time goes on. 🙂