well, we used to feed peanut oil to our show cats (shorthairs) to improve the glossiness of their coats -- and I notice if *I* eat a lot of peanuts, my hair looks better ...
My grandpa left some of those Jerky Treats out on the counter several years ago...my dad came in the back door, saw them, and took one without looking at the package. He said he realized something was wrong when they tasted funny. My dad's not the sharpest tool in the shed.
My husband said when he was a kid, he used to eat the kibbles out of the Kibbles & Bits. I don't see how, that stuff smells like Playdough. I guess that explains why I have to get a newspaper after him sometimes.
* As I've mentioned, my youngest used to eat the cat food as a toddler if we didn't keep a close eye on him-- Today he looks part wookie, and very glossy, too!