A Type D personality is distressed, Type D's have a negative outlook towards life and are pessimistic. A small event that is not even noticed by type B can ruin type D's day. Type D personalities are more subject to depression than other personality types.
For most of human history, horses were seen as prey to be hunted for sustenance. During the late Pleistocene, around 55,000 years ago, Neanderthals scavenged off of horse carcasses and made occasional kills of their own.
It's believed that humans have eaten horse meat since prehistoric times, but a modern distaste for eating horse dates back to 732 A.D. That's the year that Pope Gregory III sent a letter to his buddy Boniface that said the ritual consumption of horse meat was a pagan practice that had to be abolished.