disease - A pathological condition...
I'm sorry, but having a big, rich and tender liver isn't "pathological". Getting your head chopped off and having your liver cut out might be, but the lever wasn't diseased.
(Your definition would count a callus on your hand from hard work as a disease. Or getting an orange complexion from eating too many carrots.)
A medical dictionary provides a more helpful definition:
Disease: An alteration in the state of the body or of some of its organs, interrupting or disturbing the performance of the vital functions, and causing or threatening pain and weakness; malady; affection; illness; sickness; disorder...
http://cancerweb.ncl.ac.uk/cgi-bin/omd?diseasePathological simply means relating to disease, not necessarily relating to a fatal disease.
How can you claim that the liver in post #15 is not diseased? Are you also claiming that "Fatty Liver Disease" is not a disease?
I would say that fois gras definitely fits your definition. I visited a fois gras farm in France many years ago, and the geese definitely seemed to be in pain.