- The human body has no more need for cows' milk than it does for dogs' milk, horses' milk, or giraffes' milk.
- Speech of July 19, 1985. Quoted in David Robinson Simon, Meatonomics (Conari Press, 2013), p. 193.
- The very saddest sound in all my memory was burned into my awareness at age five on my uncle's dairy farm in Wisconsin. A cow had given birth to a beautiful male calf. The mother was allowed to nurse her calf but for a single night. On the second day after birth, my uncle took the calf from the mother and placed him in the veal pen in the barn—only ten yards away, in plain view of the mother. The mother cow could see her infant, smell him, hear him, but could not touch him, comfort him, or nurse him. The heartrending bellows that she poured forth—minute after minute, hour after hour, for five long days—were excruciating to listen to. They are the most poignant and painful auditory memories I carry in my brain. Since that age, whenever I hear anyone postulate that animals cannot really feel emotions, I need only to replay that torturous sound in my memory of that mother cow crying her bovine heart out to her infant. Mother's love knows no species barriers, and I believe that all people who are vegans in their hearts and souls know that to be true.
- Quoted in Joanne Stepaniak, The Vegan Sourcebook (Lowell House, 1998), pp. 39-40.
- 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." by Mark Huberman, National Health Association (29 April 2014).
- If I could deliver one message to the researchers who are looking for the cause of diabetes, and the cause of clogged arteries, and the cause of high blood pressure, and the cause of obesity, I would tell them the answer is in three words. It's the food! … If people adopted a plant-based diet, the changes we would see in our individual health, in our national health situation and in this physical, environmental world we live in, would be so profound.
- Interview in the documentary-film What the Health by Kip Andersen (2017).
- The current American diet is based on animal flesh and processed food: saturated fat, denatured animal protein, cholesterol, oils, refined sugars. This food is incredibly toxic to the blood vessels and the immune system, and it flows through our bloodstreams, and our children's, every four or five hours. The results are predictable. We're becoming grossly obese, arteries are clogging up. High blood pressure, diabetes, cancers. Autoimmune diseases have direct correlations with the meat and salt in animal products. The vast majority of diseases are created today by what people are eating in the West. Until that is recognized, we're just going to be treating symptoms. We're not getting to the root cause of disease, and that is the great transgression that the medical profession inadvertently perpetrates on the public.
- Interview in the book What the Health by Eunice Wong (Xlibris, 2017), ch. 1.