“It really began with my own personal evolution that brought me to a new way of thinking for ethical reasons: I wanted to get the violence out of my life and adopt a truly non-violent lifestyle. One night while pontificating over my pursuit of a non-violent lifestyle over steak dinner with a friend, he leaned forward and said, “This is all very nice, Michael, but if you really want to eliminate the violence in your life, you might want to start with that piece of flesh on your plate—because your desire for that taste of meat in your mouth is paying for the death of an animal.” When he said that, a little voice inside me said, “You know, he’s right.” And it didn’t take long before my leather shoes had to go, along with milk, cheese and everything else in my life with hidden violence attached that I could jettison, or at least, modify. I became vegan in my diet, lost 20 pounds, and saw my borderline high blood pressure drop to normal levels along with a reduction in my cholesterol levels. I then began applying this to my patients—and they saw the same great results.”

"Interview with Michael Klaper, M.D." https://web.archive.org/web/20141113185517/https://www.healthscience.org/about/nha-history/books-and-publications/health-science-summer-2013/interview-michael-klaper-md by Mark Huberman, National Health Association (29 April 2014).