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Pottenger's Cats: A Study in Nutrition
by Francis M. Pottenger [edit]

Pottenger's Cats: A Study in Nutrition
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ISBN: 0916764060
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Pottenger's Cats - A Study in Nutrition
Francis M. Pottenger, Jr., MD

Between the years of 1932 and 1942, Dr. Francis Marion Pottenger, Jr. conducted a feeding experiment to determine the effects of heat-processed food on cats. His ten-year cat study was prompted by the high rate of mortality he was experiencing among his laboratory cats undergoing adrenalectomies for use in standardizing the hormone content of the adrenal extract he was making. Because there were no existent chemical procedures for standardizing biological extracts, manufacturers of such extracts necessarily had to use animals to determine their potency. As cats die without their adrenal glands, the dose of extract required to support their lives calibrated the level of the extract's potency.

In his effort to maximize the preoperative health of his laboratory animals, Francis fed them a diet of market grade raw milk, cod liver oil and cooked meat scraps from the sanitarium. These scraps included the liver, tripe, sweetbreads, brains, heart and muscle. This diet was considered to be rich in all the important nutritive substances by the experts of the day, and the surgical technique used for the adrenalectomies was the most exacting known. Therefore, Francis was perplexed as to why his cats were poor operative risks. In seeking an explanation, he began noticing that the cats showed signs of deficiency. All showed a decrease in their reproductive capacity and many of the kittens born in the laboratory had skeletal deformities and organ malfunctions.

As his neighbors in Monrovia kept donating an increasing number of cats to his laboratory, the demand for cooked meat scraps exceeded supply and he placed an order at the local meat packing plant for raw meat scraps, again including the viscera, muscle and bone. These raw meat scraps were fed to a segregated group of cats each day and within a few months this group appeared in better health than the animals being fed cooked meat scraps. Their kittens appeared more vigorous, and most interestingly, their operative mortality decreased markedly.

The contrast in the apparent health of the cats fed raw meat and those fed cooked meat was so startling, it prompted Francis to undertake a controlled experiment. What he had observed by chance, he wanted to repeat by design. He wanted to find answers to such questions as: Why did the cats eating raw meat survive their operations more readily than those eating cooked meat? Why did the kittens of the raw meat fed cats appear more vigorous? Why did a diet based on cooked meat scraps apparently fail to provide the necessary nutritional elements for good health? He felt the findings of a controlled feeding experiment might illumine new facts about optimal human nutrition.

The Cat Study of Francis M. Pottenger, Jr., MD is unique. There is no similar experiment in the medical literature. The pathological and chemical findings were supervised by Francis in consultation with Alvin G. Foord, M.D., professor of pathology at the University of Southern California and pathologist at the Huntington Memorial Hospital in Pasadena. Accordingly, the studies met the most rigorous scientific standards of the day and their protocol was observed consistently.

Since The Cat Study is unique, its findings are frequently quoted and misquoted in order to justify the ideas of others. For example, one author of a popular selling book states that 200 cats died of arthritis; this indeed did not happen. Another author states that the cats were fed sprouts and survived in full health for four continuous generations. Again, no such experiment took place, and yet this misinformation has been traced over a dozen or more different articles and books.

A frequent criticism of The Pottenger Cat Study is that it was not properly controlled. Here it is necessary to ask, "By what standards?" Every one of the studies followed strictly defined protocol. All variables in the stock of the animals were reported and explained. Because some of the test procedures may seem crude forty years later, this in no way invalidates the facts that the procedures were meticulously controlled and that the results of the experiments were reported as observed.

Another criticism is that the cats were kept in an artificial environment unrelated to real living conditions. Such a criticism overlooks the experimental necessity of maintaining a controlled environment to provide valid findings. It also overlooks the evidence that given specific living conditions, specific changes repeatedly occurred in the health of the cats under observation.

Another frequent criticism is that the experimental work done on cat nutrition has no appropriate application to human nutrition. Francis M. Pottenger, Jr., MD never stated that a one-to-one comparison could be made between his findings in cat nutrition and his findings in human nutrition. He did say: "While no attempt will be made to correlate the changes in the animals studied with malformations found in humans, the similarity is so obvious that parallel pictures will suggest themselves."

All too often, self-appointed authorities will state categorically that they do not believe other's observations and so seek to close the door on any further inquiry into these observations. They declare, "Because I do not believe the facts as presented, they are not so." Far better for science if responsible individuals maintain an attitude of open inquiry and test the observations of others before forming rigid opinions. In the case of The Cat Study, human welfare might well be served of concerned researchers made every effort to discover if valid correlation's can be made between cat nutrition and human nutrition. It must be remembered that cats and humans both are mammalian biological systems.


Francis M. Pottenger (Biography)

Francis M Pottenger, Jr. was a physician who successfully applied the principles of Weston Price in his treatment of respiratory diseases such as TB, asthma, allergies and emphysema. At his sanitorium in Monrovia, California he served liberal amounts of liver, butter, cream and eggs to convalescing patients. He also gave supplements of adrenal cortex to treat exhaustion.

Like Price, Pottenger was also a researcher. He decided to perform adrenalectomy on cats and then fed them the adrenal cortex extract he prepared for his patients in order to test its effectiveness. Unfortunately most of the cats died during the operation. He conceived of an experiment in which one group of cats received only raw milk and raw meat, while other groups received part of the diet as pasteurized milk or cooked meat, summarized as follows:

The Meat Study:

ADEQUATE DIET A: 1/3 RAW milk, cod liver oil and 2/3 RAW meat
DEFICIENT DIET B: 1/3 RAW meat, cod liver oil and 2/3 PASTEURIZED milk
DEFICIENT DIET C: 1/3 RAW meat, cod liver oil and 2/3 EVAPORATED milk
DEFICIENT DIET D: 1/3 RAW meat, cod liver oil and 2/3 SWEETENED CONDENSED milk
DEFICIENT DIET E: RAW METABOLIZED VITAMIN D milk only

1. From cows on dry feed
2. From cows on green feed

Pottenger found that only those cats whose diet was totally raw survived the adrenalectomy and as his research progressed, he noticed that only the all-raw group continued in good health generation after generation—they had excellent bone structure, freedom from parasites and vermin, easy pregnancies and gentle dispositions. All of the groups whose diet was partially cooked developed "facial deformities" of the exact same kind that Price observed in human groups on the "displacing foods of modern commerce"—narrowed faces, crowded jaws, frail bones and weakened ligaments. They were plagued with parasites, developed all manner of diseases and had difficult pregnancies. Female cats became aggressive while the males became docile. After just three generations, young animals died before reaching adulthood and reproduction ceased.

The results of Pottenger’s cat experiments are often misinterpreted. They do not mean that humans should eat only raw foods—humans are not cats. Part of the diet was cooked in all the healthy groups Price studied and Pottenger fed a diet of both raw and cooked food to his patients. (Milk products, however, were almost always consumed raw among healthy primitives and Pottenger was a strong advocate for clean, certified raw milk.)

Pottenger’s findings must be seen in the context of the Price research and can be interpreted as follows: When the human diet produces "facial deformities"—the progressive narrowing of the face and crowding of the teeth—extinction will occur if that diet is followed for several generations. The implications for western civilization-obsessed as it is with refined, highly sweetened convenience foods and low-fat items—is profound.

Pottenger also pioneered the use of gelatin-rich meat bone broth for the treatment of disease and the maintenance of good health. His seminal article "Hydrophilic Colloid Diet," stated the case for traditional stock, rich in minerals and hydrophilic gelatin, as an aid to digestion and a source of minerals in easily assimilated form. He often stated that the stock pot was the most important piece of kitchen equipment a family could own.

Pottenger was also one of the first to explore the differing effects of the two parts of the autonomic nervous system, observing that too much stress on the parasympathetic nervous system caused one set of symptoms while too much stress on the sympathetic nervous system caused another set of symptoms.

Pottenger’s most important articles are published in Pottenger’s Cats 

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