I've noticed several postings on what people are feeding their cats in
order to avoid commercial pet food.  To those of you who are feeding
canned tuna intended for human consumption, I've read that it is harmful
to cats when fed exclusively, but that the occasional can of tuna is
fine.  Sorry that I don't remember the reference, but you can do a
search if you're interested.  It might have been a missing ingredient
rather that a toxic one--don't remember.  Check it out, though, if
you're using tuna in your cat's diet.  Thanks.

Diana