/Stolen from another forum/

For those still confused about food, more fuel for the fire (yes I
know these things always cause flame-wars but the readers need to form
their own opinion)

http://www.avma.org/convention/recap/news/tuesday16.asp
"Since cats became domesticated, they have been fed various diets, and
some of these diets were developed with little thought as to their
natural diet in the wild. The result hasn't been good. "Many of the
diseases that we treat are a result of the diets we give them," said
Dr. Greco, who rattled off several examples."

(click link to read more)