I recall a lecture at a conference re: cow's milk breaking down into a
morphine like substance. This was one way of explaining how some people
"have to have" their milk. Also to explain why baby cows go so long between
feeds. Sorry I can't rem. specifics of the lecture. I'm sure someone else
out there has the details. I've had 3 babies since then and my recall has
diminished!
Evonne