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April 10, 2026
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"At Yale, I initially continued research on the problems which I brought from Poland. Within a few months, I made five papers and then published them in the leading American and British magazines. They liked me, they came to the conclusion that Ptak is good and efficient. The head of the Department of Pathology was then Richard K. Gershon, would-be Nobel Prize winner, a Polish Jew in a third generation. He died of lung cancer in 1983, at the age of fifty. We were close friends; I spent the last months of his life with him. Sometimes, speaking with me, he joked: âYou're too intelligent not to be Jewish.â"
"As for the number of people reluctant to me, I guess I fall in the national average. Maybe it's about talking openly what I think? For example, in 1980 an interview with several professors â including myself â was ran by the newspaper Dziennik Polski, very much against the then authorities. We've all been in favor of far-reaching changes, but each of us saw these changes differently. I am a nonbeliever. And there comes the âSolidarityâ with holy masses and sprinkling corpses with holy water. I thought that policy of the University, beneficial to the âSolidarityâ, was not always beneficial for the University itself. From time to time, friendly people try to affront me, even though I did not belong neither to the youth communist organization neither to the party, neither had I contacts with the communist Security Service. And generally I didn't have herd instincts."
"The duration of the life of men may be considerably increased. It would be true progress to go back to the simple dishes of our ancestors. ⌠Progress would consist in simplifying many sides of the lives of civilised people."
"All mammals nurse their young, and breast milk benefits a newborn infant in ways above and beyond nutrition. In fact, until 1 to 2 years of age, the American Academy of Pediatrics, the World Health Organization, the Institute of Medicine and more promote breast-feeding as optimal. Unfortunately, breast-feeding until that age is often difficult, if not impossible, because mothers have to return to work, and children go off to preschool or day care. So we often replace human milk with the milk of cows or other animals. But at a certain point, we have to acknowledge that we are the only mammals on the planet that continue to consume milk after childhood, often in great amounts. More and more evidence is surfacing, however, that milk consumption may not only be unhelpful, it might also be detrimental. ⌠thereâs very little evidence that most adults need it. Thereâs also very little evidence that itâs doing them much good."
"There's no question that largely vegetarian diets are as healthy as you can get. The evidence is so strong and overwhelming and produced over such a long period of time that it's no longer debatable."
"The standard four food groups are based on American agricultural lobbies. Why do we have a milk group? Because we have a National Dairy Council. Why do we have a meat group? Because we have an extremely powerful [meat lobby]."
"Cow milk has no valid claim as the perfect food. As nutrition, it produces allergies in infants, diarrhea and cramps in the older child and adult, and may be a factor in the development of heart attacks and strokes. Perhaps when the public is educated as to the hazards of milk only calves will be left to drink the real thing. Only calves should drink the real thing."
"In 1974 the Federal Trade Commission finally began to catch up with the dairy industry. Specifically, the FTC issued a "proposed complaint" against the California Milk Producers Advisory Board and Cunningham and Walsh, its advertising agency. In the complaint they charged that the dairymen's campaign to stimulate milk sales constituted false, misleading, and deceptive advertising. The dairy industry was shocked. After all, what had they done other than to proclaim that "Everybody Needs Milk?" The public has heard that line for years. This time the FTC wasn't buying the slogan. They couldn't. Too much scientific evidence had been accumulated which indicated that people didn't need milk and, in fact, that it could be harmful to your health."
""But, doctor, what will happen to my teeth and bones if I stop drinking milk?" Nothing. Nothing that wouldn't have happened anyway."
"Organizations such as the American Heart Association have strongly urged that the consumption of milk and other dairy products be reduced by Americans of all ages-and for good reason. Diseases of the heart and major blood vessels will kill about one million Americans this year."
"At last a growing number of physicians, private citizens and even the Federal Trade Commission are beginning to re-examine these long standing and deeply ingrained beliefs in the virtue of cow milk. And even Richard Nixon and John Connally came to realize that cow milk may not be good for you. The fact is: the drinking of cow milk has been linked to iron-deficiency anemia in infants and children; it has been named as the cause of cramps and diarrhea in much of the world's population, and the cause of multiple forms of allergy as well; and the possibility has been raised that it may play a central role in the origins of atherosclerosis and heart attacks."
"In general, most animals are exclusively breast-fed until they have tripled their birth weight, which in human infants occurs around the age of one year. In no mammalian species, except for the human (and the domestic cat), is milk consumption continued after the weaning period. Calves thrive on cow milk. Cow milk is for calves."
"My job was to manage the editorial production of the firstâand as yet onlyâSurgeon General's Report on Nutrition and Health ⌠My first day on the job, I was given the rules: No matter what the research indicated, the report could not recommend âeat less meatâ as a way to reduce intake of saturated fat, nor could it suggest restrictions on intake of any other category of food. In the industry-friendly climate of the Reagan administration, the producers of foods that might be affected by such advice would complain to their beneficiaries in Congress, and the report would never be published."
"I don't understand why asking people to eat a well-balanced vegetarian diet is considered drastic, while it's medically conservative to cut people open or put them on powerful cholesterol-lowering drugs for the rest of their lives ⌠Animal products are the main culprit in what is killing us. We can absolutely live better lives without them."
"When you eat a healthy, whole foods, plant-based diet, it changes the expression of your genes. It turns on the good genes, turns off the bad genes. Your genes are a predisposition, but your genes are not your fate. And even if your mother and your father and aunts and uncles all died of diabetes, cancer, even heart disease, it doesn't mean that you need to."
"In addition to preventing many chronic diseases ⌠comprehensive lifestyle changes can often reverse the progression of these illnesses. ⌠Changing lifestyle actually changes your genesâturning on genes that keep you healthy, and turning off genes that promote heart disease, prostate cancer, breast cancer, and diabetesâmore than five hundred genes in only three months. People often say, âOh, it's all in my genes. There's not much I can do about it.â But there is. Knowing that changing lifestyle changes our genes is often very motivatingânot to blame, but to empower. ⌠[Our approach is] not like there was one set of dietary recommendations for reversing heart disease, a different one for reversing diabetes, and yet another for changing your genes or lengthening your telomeres. In all of our studies, people were asked to consume a whole-foods, plant-based diet ⌠It's as though your body knows how to personalize the medicine it needs if you give it the right raw materials in your diet and lifestyle. ⌠And what's good for you is good for our planet. To the degree we transition toward a whole-foods, plant-based diet, it not only makes a difference in our own lives; it also makes a difference in the lives of many others across the globe."
"Our research has shown that your body often has a remarkable capacity to begin healing itselfâand much more quickly than people once realizedâwhen we address the underlying causes of illness. For many people, the choices we make each day in what we eat and in how we live are among the most important underlying causes. When most people are prescribed medications to lower their blood pressure, cholesterol, or blood sugar, they are usually told, âYou will have to take this for the rest of your life," often in ever-increasing dosages. Why? Because the underlying causes are not being addressed. When I lecture, I often show a slide of doctors busily mopping up the floor around an overflowing sink without also turning off the faucet."
"Comprehensive lifestyle changes may be able to bring about regression of even severe coronary atherosclerosis after only 1 year, without use of lipid-lowering drugs."
"In concluding these papers, I hope I may be permitted to offer a few words in favour of anatomy, as better adapted for discovery than experiment. ⌠Experiments have never been the means of discovery; and a survey of what has been attempted of late years in physiology, will prove that the opening of living animals has done more to perpetuate error, than to confirm the just views taken from the study of anatomy and natural motions."
"Anti-cruelty societies should be encouraged. The progress of science has suffered little by their existence, and humanity has gained much."
"There will come a time when the world will look back to modern vivisection in the name of science as they now do to burning at the stake in the name of religion."
"Every discoverer of a new truth, or inventor of the method which evolves it, makes a dozen, perhaps fifty, useless combinations, experiments, or trials for one successful one. In the realm of electricity or of mechanics there is no objection to this. But when such rejected failures involve a torture of animals, sometimes fearful in its character, there is a distinct objection to it."
"There can be no question that the practice of vivisection hardens the sensibility of the operator and begets indifference to the infliction of pain, as well as great carelessness in judging of its severity."
"It should not for a moment be supposed that cultivation of the intellect leads a man to shrink from inflicting pain. Many educated men are no more humane, are in fact far less so, than many comparatively uneducated people."
"Watch the students at a vivisection. It is the blood and suffering, not the science, that rivet their breathless attention. If hospital service makes young students less tender of suffering, vivisection deadens their humanity, and begets indifference to it."
"The horrors of have supplanted the solemnity, the thrilling fascination, of the old unetherized operation upon the human sufferer. Their recorded phenomena, stored away by the physiological inquisitor on dusty shelves, are mostly of as little present use to man as the knowledge of a new comet or of a tungstate of zirconium: perhaps to be confuted the next year, perhaps to remain as fixed truth of immediate value, â contemptibly small compared with the price paid for it in agony and torture."
"I should be writing a third paper on the Nerves, but I cannot proceed without making some experiments, which are so unpleasant to make that I defer them. You may think me silly, but I cannot perfectly convince myself that I am authorised in nature, or religion, to do these crueltiesâfor what?âfor anything else than a little egotism or self-aggrandisement; and yet, what are my experiments in comparison with those which are daily done? and are done daily for nothing. So my employment is, correcting the press of my new edition of the Anatomy, and writing notes for my Physiology, which I mean to make an additional volume to the Anatomy."
"Even though itâs applied science weâre dealinâ with, it still is â science!"
"Pharmacokinetics may be simply defined as what the body does to the drug, as opposed to pharmacodynamics, which may be defined as what the drug does to the body."
"So then Mom decided my father ought to do a vegan diet, too. Well, my father grew up on a cattle ranch, but the nice thing is, my dadâs been sitting at the same dinner table for fifty-one years, and he canât find his way around the kitchen! Heâs been relying my Mom for fifty-one years to put the plate in front of him. So Mom went to the local health food store and bought hot dogs that are called âNot Dogsâ and veggie burgers â which used to taste like cardboard, but now theyâre really good. She can get Canadian bacon made of a wheat derivative. Itâs all vegetarian. Instead of cowâs milk, itâs soy milk, rice milk, fake eggs â all that stuff! Dad just keeps cleaning his plate. Now Iâve got two vegetarian parents, and only one of them know it!"
"I think of genes in two ways. There are dictator genes. Those genes give ordersâblue eyes or brown hairâand you don't have any choice. The genes for diabetes, heart disease, or certain forms of cancer, they're more like committees giving suggestions. But you've got a lot of control over whether those genes ever express themselves. The vista on diet-related disease is spreading out in a bigger way than we ever imagined. We thought maybe diet affected heart disease and a few cancers. Then there was diabetes. Now it's also brain diseaseânot only stroke but also Alzheimer's. We thought that was entirely due to genes and age. Now we know it's due, to a very substantial degree, to diet. We've got control. Not perfect control, but certainly control we never had before."
"When people are eating meat, I think of it as a bit like smoking. Itâs 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 youâre a man, about 1 in 2. A woman, 1 in 3. Your chances of gaining weight, 2 out of 3. Itâs 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."
"Diabetes is not and never was caused by eating a high carbohydrate diet, and it is not caused by eating sugar. The cause of diabetes is a diet that builds up the amount of fat into the blood. I'm talking about a typical meat-based, animal-based diet. You can look into the muscle cells of the human body, and you find they're building up tiny particles of fat which is causing insulin resistance. What that means is the sugar that is naturally from the foods that you're eating can't get into the cells where it belongs. It builds up in the blood and that is diabetes."
"As I began to move away from a meatheavy diet to a plantbased menu, it felt as if the doors to truly delicious foods were finally opening up."
"By setting aside animal-derived productsâmeat, dairy products, and eggsâyou 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 choices from diet to outlook to emotional state directly alter our neural and gene activity at every moment."
"Human beings are not natural carnivores. When we kill animals to eat them, they end up killing us because their flesh, which contains cholesterol and saturated fat, was never intended for human beings, who are natural herbivores."
"Although most of us conduct our lives as omnivores, in that we eat flesh as well as vegetables and fruits, human beings have characteristics of herbivores, not carnivores. The appendages of carnivores are claws; those of herbivores are hands or hooves. The teeth of carnivores are sharp; those of herbivores are mainly flat (for grinding). The intestinal tract of carnivores is short (3 times body length); that of herbivores, long (12 times body length). Body cooling of carnivores is done by panting; herbivores, by sweating. Carnivores drink fluids by lapping; herbivores, by sipping. Carnivores produce their own vitamin C, whereas herbivores obtain it from their diet. Thus, humans have characteristics of herbivores, not carnivores."
"In the last few years there has been a harvest of books and lectures about the "Mysterious Universe." The inconceivable magnitudes with which astronomy deals produce a sense of awe which lends itself to a poetic and philosophical treatment. "When I consider thy heavens, the work of thy hands, the moon and the starts, whuch thou hast ordained: what is man that thou art mindful of him? The literary skill with which this branch of science has been exploited compels one's admiration, but also, a little, one's sense of the ridiculous. For other facts than those of astronomy, oother disciplines than of mathematics, can produce the same lively feelings of awe and reverence: the extraordinary finenness of their adjustments to the world outside: the amazing faculties of the human mind, of which we know neither whence it comes not whither it goes. In some fortunate people this reverence is produced by the natural bauty of a landscape, by the majesty of an ancient building, by the heroism of a rescue party, by poetry, or by music. God is doubtless a Mathematician, but he is also a Physiologist, an Engineer, a Mother, an Architect, a Coal Miner, a Poet, and a Gardener. Each of us views things in his own peculiar war, each clothes the Creator in a manner which fits into his own scheme. My God, for instance, among his other professions, is an Inventor: I picture him inventing water, carbon dioxide, and haemoglobin, crabs, frogs, and cuttle fish, whales and filterpassing organisms ( in the ratio of 100,000,000,000,000,000,000,000 to 1 in size), and rejoicing greatly over these weird and ingenious things, just as I rejoice greatly over some simple bit of apparatus. But I would nor urge that God is only an Inventor: for inventors are apt, as those who know them realize, to be very dull dogs. Indeed, I should be inclined rather to imagine God to be like a University, with all its teachers and professors together: not omittin the students, for he obviously possesses, judging from his inventions, that noblest human characteristic, a sense of humour."
"All knowledge, not only that of the natural world, can be used for evil as well as good: and in all ages there continue to be people who think that its fruit should be forbidden. Does the future wlfare, therefore, of mankind depend of a refusal of science and a more intensive study of the Sermon on the Mount? There are others who hold the contray opinion, that more and more of science and its applications alone can bring prosperity and happiness to men. Both of these extremes views seem to me entirely wrong - though the second is the more perilous as more likely to be commonly accepted. The so-called conflict between science and religion is usually about words, too often the words of their unbalanced advocates: the reality lies somewhere in between. "Completeness and dignity", to use Tyndall's phrase, are brought to man by three main channels, first by the religiouos sentiment and its embodiment of ethical principles, secondly by the influence of what is beautiful in nature, human personality, or art, and thirdly, by the pursuit of scientific truth and its resolute use in improving human life. Some suppose that religion and beauty are incompatible: others, that the aesthetic has no relation to the scientific sense: both seem to me just as mistaken as those who hold that the scientific and the religious spirit are necessarily opposed. Co-operation is required, not conflict: for science can be used to express and apply the principles of ethics, and those principles themselves can guide the behaviour of scientific men: while the appreciation of what is good and beautiful can provide to both a vision of encouragement. Is there really then any special ethical dilemma which we scientific men, as distinct from other people, have to meet? I think not: unless it be to convince ourselves humbly that we are just like others in having moral issues to face. It is true that integrity of thought is the absolute condition of oour work, and that judgments of value must never be allowed to deflect our judgements of fact. But in this we are not unique. It is true that scientific research has opened up the possibility of unprecedented good, or unlimited harm, for manking: but the use is made of it depends in the end on the moral judgments of the whole community of men. It is totally impossible noew to reverse the process of discovery: it will certainly go on. To help to guide its use aright is not a scientific dilemma, but the honourable and compelling duty of a good citizen."
"To suppose that chemistry and poetry are incompatible (as I am sure Prof Donnan would not do!), or that biology is inconsistent with a religious outlook on the world (I don not say with theology!) is to misunderstand entirely what the human mind, by contemplation and experiment, has achieved. By extreme specialization at intervals, by overloading the machine to its limit, discoveries and progress are made: but their bearing is best seen by letting the engine idle and giving oneself time to look around. The chemist and the poet are both right, the biologist and the saint: and each must pull up now and then to find whither he is going and to adjust his spectacles."
"If we can get cold Coca-Cola and beer to every remote corner of Africa, it should not be impossible to do the same with drugs."
"The gap between 'the State' and 'a machine' is not so wide."
"Natural knowledge has not forgone emotion. It has simply taken for itself new ground of emotion, under impulsion from and in sacrifice to that one of its 'values', Truth."
"And the pursuit whose quest is Nature's understanding, has this among its rewards, that as it progresses its truth is testable. Truth is a 'value'. The quest itself is therefore in a measure its own satisfaction. We receive the lesson that our advance to knowledge is of asymptotic type, even as continually approaching so continually without arrival. The satisfaction shall therefore be eternal."
"Mind, for anything perception can compass, goes therefore in our spatial world more ghostly than a ghost. Invisible, intangible, it is a thing not even of outline; it is not a 'thing'. It remains without sensual confirmation, and remains without it for ever. All that counts in life. Desire, zest, truth, love, knowledge, 'values', and, seeking metaphor to eke out expression, hell's depth and heaven's utmost height. Naked mind."
"Science is the fruit of patient toil, sifting out facts and in search of more facts. It has no tilt against religion as such. It knows its own field to be vast, but also knows it limited."
"Biology cannot go far in its subject before being met by mind."
"[A]s followers of natural science we know nothing of any relation between thoughts and the brain, except as a gross correlation in time and space."
"A vast number, perhaps the numerical majority, of animal forms cannot be shown unequivocally to possess mind."