I’ll take my milk pasteurized, thanks

A recent article in Vassar’s newspaper, The Miscellany News, discussed the Vassar Raw Milk Co-op, which brings unpasteurized milk to Vassar College (Co-op offers raw milk delivery service, Nov 10,2011). The article raises several important questions about raw milk, pasteurization, and sustainable agriculture, but some of the information presented is incorrect. Importantly, Vassar’s Raw Milk Co-op website, to which readers are directed, has a great deal of misleading, incorrect or unsubstantiated information.

In the production and packaging of milk, it can become contaminated at virtually any stage of the process. That contamination, when it is by organisms like E. coli or Listeria, is what causes milkborne illness. Pasteurization, a process of heating milk to reduce the levels of microorganisms present, will kill those contaminating bacteria if they are present. The risk in drinking raw milk is due to the fact that if it does become contaminated, you will be consuming those pathogens. In a farm environment, it is safe to assume that contamination will, at some point, happen. Pasteurization is one check that we have to protect us from that.

The majority of cases of milkborne illness result in diarrhea and/or vomiting. Occasionally the symptoms can be more severe, such as in last week’s outbreak in California, in which five children have become sick. Three have been sent to the hospital with hemolytic uremic syndrome, which can lead to kidney failure. These cases have led to the recall of the organic raw milk, contaminated with E. coil 0157:H7, which has been linked to the outbreak. There are outbreaks associated with pasteurized milk as well, usually due to post-pasteurization contamination, such as at the packaging stage. However, it is estimated that only 1% of people consume raw milk, but from 2000-2007, 75% of outbreaks were associated with contaminated raw milk.

In NY consumers can choose to buy raw milk from a farm if they determine that they are comfortable with the level of risk. But it is also important that they know the facts behind the reported benefits to balance their decision. Many proponents of raw milk claim that industrially raised, antibiotic laden cattle given GMO corn feed produce milk that needs to be pasteurized because it is inherently of poor quality and unsafe, but that organically raised pasture fed cows produce milk that is safe. That is simply untrue. Pasteurization was developed in the mid 1800s to eliminate pathogenic and spoilage microorganisms, not to fix the problems of industrialized agriculture. There is no credible scientific evidence to support the suggestion that organic pasture-fed cows generate safer milk than cows from industrial farms. Contamination by pathogenic organisms comes from fecal matter, the environment, the handlers, packaging, storage, and undetected infections in the animals, and is unrelated to diet and housing conditions.

Additional claims such as that pasteurized milk causes allergies, asthma or other conditions are not supported by the scientific literature. The claim that raw milk is better for individuals who are lactose intolerant is not supported by scientific data either, and represents a clear misinterpretation or misunderstanding of available information. The level of nutrients in raw compared to pasteurized milk is not significantly different, invalidating yet another central claim in support of raw milk.

There is an abundance of misinformation on the topic of raw milk. Unfortunately, groups like Vassar’s Raw Milk Co-op perpetuate this misinformation. At Vassar, we often say “go to the source.” This is an opportunity to practice that principle. Rather than seeking confirmation of one’s beliefs in the websites of others, we must check the original research. What is actually supported by credible scientific investigations? Is the information you are reading being correctly interpreted? Are you getting the whole story or just fragments?

There are many good things about the locavore and Slow Food movements. Supporting small local farms and sustainable agriculture, humane treatment of animals and having the sense of community achieved from getting to know the farmer who raises your food, are important to me and many people. But you don’t need to consume raw milk to do that. These issues are distinct from the question of pasteurization. If you want, you can even get the raw milk and pasteurize it yourself. Just heat your milk on the stove to 63C for 30min before drinking it.

Thanks to the students in STS/Biol 172 for discussion and research on this topic

A few links:
FDA Milk Safety

CDC Milk Safety

Review on Milk Safety and Pasteurization

A recent review of the scientific literature. Note that they included many studies of poor design, which should have been ignored.

Slightly updated and edited on December 1, 2011


2 thoughts on “I’ll take my milk pasteurized, thanks”

  1. Im not sure what you mean by “padded” research. Is it a general accusation of falsifying data to keep Big Milk profits up? Accusation of such ethical violations should not be done without substantial evidence to back it up, which I am going to assume you don’t have. Is it really easier to believe that lot of unethical people are all conspiring together than, perhaps, that the the collective data from numerous independent scientists and public health investigators is in fact correct?
    You close with “the worst part is the farmer pays the price either way.” I seriously doubt that the misinformation perpetuated by many raw milk advocates is in any way beneficial to the farmers. Ultimately, wouldn’t it be best for the farmers to communicate accurate information and develop regulations that minimize the risks associated with consuming raw milk? I don’t imagine most people would want to continue buying something if they felt they had been lied to or misled. And pretending that there aren’t risks isn’t going to help the farmer or the consumer. It is particularly bad for a farmer to have to recall milk, or to have their name associated with an outbreak. Instead, it is necessary to deal with the reality that raw milk is the source of many foodborne disease outbreaks and develop approaches to reducing that risk.

  2. I do agree that Raw Milk under the present transportation and consolidation methodology would be far more susceptible to disease causing organisms- and should probably be pasturized for the masses. However, if a small group of like minded individuals makes that choice to buy from a small local producer who also believes in the nutritional benefits and purity of said product, it’s not worthy of sending in SWAT teams to stop the practice.
    I suspect David, that you are able to discern not only bad research and information without proper documantation, but perhaps also “padded” research to benefit a capitalists intentions of profiting even more.
    The worst part is the farmer pays the price either way.

Comments are closed.