I noticed during my last couple of fast days that I cope much better if I make lunch my largest meal on a fast day. For example, yesterday I had a small portion of yoghurt for breakfast and a hearty portion of veg/lentil soup for lunch (250 calories!) and some cherry tomatoes for dinner. I literally didn't feel like eating much for dinner. I also noticed that having three proper (but sensible) meals the day before really helps too.
The trick for me is that it keeps me going on a long work day without feeling too light-headed in the afternoon.
The trick for me is that it keeps me going on a long work day without feeling too light-headed in the afternoon.