There isn't much debate on the downsides of consumption of animal protein. Study after study has demonstrated that heavily animal-based diets are associated with high cardiovascular mortality and cancer risk.

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.

By setting aside animal-derived products—meat, dairy products, and eggs—you can reach a level of health and well-being that you may never have expected you could enjoy. … Although our work has focused on helping people trim down, conquer diabetes, cut cholesterol, and tackle other medical problems, it should be said that not everyone who decides to forgo animal products makes that choice for health reasons. Many people are concerned with how animals are treated by the food industries, and rightly so. And the environmental consequences of meat and dairy production should be of concern to all of us.

Our study [China Diet and Health Study] suggests that the closer one approaches a total plant food diet, the greater the health benefit. … It turns out that animal protein, when consumed, exhibits a variety of undesirable health effects. Whether it is the immune system, various enzyme systems, the uptake of carcinogens into the cells, or hormonal activities, animal protein generally only causes mischief. High fat intake still can be a problem, and we ought not to be consuming such high-fat diets. But I suggest that animal protein is more problematic in this whole diet/disease relationship than is total fat.

Is a vegetarian permitted to eat animal crackers?

It's really true that animal food makes the mind cloudy.

It should be remembered that the pharmacologic treatment of raised farm animals can cause damage to the health of anyone who eats their meat. For example, the antibiotics that are legally added to animal feed—with the objective of preventing infections—can cause a resistance to antibiotics in humans. That is to say, a selection of bacterial strains resistant to antibiotics can be transmitted from animals to man through food; and can thereby generate infections difficult to stop (at times fatal, as with salmonella).

I often discuss the benefits of adopting a plant-based diet with patients who have high cholesterol, diabetes, hypertension, or coronary artery disease. I encourage these patients to go to the grocery store and sample different plant-based versions of many of the basic foods they eat. … Interestingly, our ACC/ (AHA) prevention guidelines do not specifically recommend a vegan diet, as the studies are very large and observational or small and randomized, such as those on Ornish's whole food, plant-based diet intervention reversing coronary artery stenosis. The data are very compelling, but larger randomized trials are needed to pass muster with our rigorous guideline methodology. Wouldn't it be a laudable goal of the American College of Cardiology to put ourselves out of business within a generation or two? We have come a long way in prevention of cardiovascular disease, but we still have a long way to go. Improving our lifestyles with improved diet and exercise will help us get there.

When people are eating meat, I think of it as a bit like smoking. It’s sort of Russian roulette. You may not get diabetes, but your chances of getting diabetes, about 1 in 3. You may not get cancer, but, your chances, if you’re a man, about 1 in 2. A woman, 1 in 3. Your chances of gaining weight, 2 out of 3. It’s not all diet, but, most of it is. The best thing that you can do to make sure that you empty all those bullets out of the chamber and not taking a risk with your health is to get the animal products out of your diet and eat healthy foods.

Food becomes medicine or poison depending on your heart.

I've seen how violently animals raised for food are treated, and I don't want to support that. … The fact that the meat on my plate was once a living, breathing creature became something I could no longer ignore or justify as food. … As someone who felt they were a confirmed meat-eater, I guess ultimately if I can do it, then anyone can, you know―it’s a really easy choice to make. And it’s a humane choice to make.

We have to consider that the foods we ingest let a certain amount of soluble toxic substances dispersed in the environment into our bodies. These polluting substances are harmful if we breathe them in, but they are even more so if we ingest them. By consuming meat, we put ourselves precisely in that position, because such substances in the atmosphere fall back to Earth, and hence, onto the grass that, when eaten by cattle, introduces harmful substances into their adipose deposits and therefore into their flesh, and finally, onto our plates.

With respect to animal diet, let it be considered, that taking away the lives of animals, in order to convert them into food, does great violence to the principles of benevolence and compassion. This appears from the frequent hard-heartedness and cruelty found amongst those persons whose occupations engage them in destroying animal life, as well as from the uneasiness which others feel in beholding the butchery of animals.

I'm not a vegetarian, but I eat animals who are.