runswalken got me thinking(long article here)
and that may or may not be a good thing---(Smiley here)
I thank her for stimulating my curiosity.
Anyway, the discussion over pet food ingredients made me start looking and that led to several discoveries.
Her referrence to Ann Martins book gave rise to the term 'denaturing'. That is the process---according to Ann---of adding a chemical to renderings that makes it unuseable for human consumption. Of course, the way Ann writes, that process is terrible. However, humans cannot eat anything close to what animals can-----that fact was convienently left out.
Anyway, I am researching that process---'denaturing'.
Come to find out, denaturing happens when we cook/prepare almost any food. A hard boiled egg is made possible because of the denaturing process.
So, I found the following article on the subject.
There are some examples of terrible experiments---on both dogs and humans included.
The article is referrenced below
Here is a link that might be useful: Denaturizing foods