Yes, I had to start eating the same as Sue, tiny amounts and I found, still find, that if I'm doing something while I'm eating, I'm not thinking about having to eat it. I drink Ensure milkshakes and I'm now back to a reasonable weight, although I am also on medication.
A bit like lying in bed thinking I really must go to sleep, and your mind is focused on that, you will not fall asleep. The minute your mind wanders off, off you drop!