Thanks for all the replies on the fat question - the links are very interesting.
I'm a bit concerned about the lack of fibre, though. Because (I guess) of all the fat I'm eating, I don't have Any problems at all with constipation, which I thought I might have.
So the question is: is the only point of fibre to make things pass through faster? If that's happening without the fibre, does it matter that I'm not getting very much of it?