I'm glad to see someone else experiences this.
I mentioned it happening to me in another thread (in which everyone was talking about runners' munchies and wanting to eat anything sugary in sight) and I ended up feeling like a freak of nature.
It gets worse if I just get in from a run over 10 miles and cook straight away. I have a dull sense that I should eat, rather than any real appetite, and take more than 20 minutes to eat food that I would have wolfed down in years past.
The body doesn't really register calories taken in as fluid, as Sarah suggests (why it's so easy to get fat on sugary drinks), so a milk/cream/banana based smoothie is probably a very good option.