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The Myth of Homogenized and Non-Homogenized Milk

Nearly every aspect of cow’s milk inspires debate– from its fat, protein, and sugar (lactose) content to hormone residues it may contain, the pasteurization process it undergoes, and even its very suitability for human consumption. We’ve discussed all that, but some have raised concerns about something else – homogenization.

Homogenized Milk

You may wonder, what could be wrong with homogenized milk? Well, it seems there are plenty of people who are promoting “non-homogenized” milk as a healthier option. You may see it on the shelves in health-food stores and some supermarkets. Let’s get one thing out of the way first: non-homogenized isn’t necessarily raw milk (“raw” simply means not pasteurized). Though all raw milk is non-homogenized, not all non-homogenized milk is raw. And while raw milk poses definite health risks, non-homogenized milk does not unless it’s not pasteurized.

Ye olde milke?

When cow’s milk is not homogenized, its fat separates out, producing a layer of cream on top. Developed in the late nineteenth century, commercial homogenization is a mechanical (not chemical) process that breaks up the fat globules to such a small size that they remain suspended evenly in the milk, producing a uniform (homogeneous) consistency.

It also gives milk a longer shelf life. “Nonfat milk– formerly called “skim” milk because the fat was skimmed off– is also homogenized, since it contains some fat, albeit a very small amount.

According to its detractors, homogenized milk contributes to heart disease, diabetes, and other chronic disorders, as well as allergies, largely by boosting the absorbability of an enzyme in milk called xanthine oxidase (XOD). They claim that the resulting higher blood levels of XOD increase disease, promoting inflammatory processes.

While it’s true that elevated activity of XOD (alongside with other enzymes) produced in the body can increase inflammation, the adverse effects of XOD in milk remain theoretical. In any case, the point is moot, because XOD is not absorbed from any food. The notion that homogenization, and milk’s XOD in particular, is a health hazard was originally disproven by researchers from the University of California Davis in a paper in the American Journal of Clinical Nutrition in 1983. Subsequently research has also debunked it.

In addition, studies have shown that homogenization actually improves the digestibility of milk and that it does not increase the risk of milk allergy or intolerance in children or adults.

Bottom Line:

Over the years nearly all the fears about milk have proven to be unfounded (see WellnessLetter.com/milk). Many studies have linked dairy products possibly even whole milk, despite its saturated fat– to reduce risk of cardiovascular disease. Researchers continue to examine the effects of various milk components on the risk of heart disease and on health in general. So far there’s no convincing evidence that homogenization is an issue. The only reason to drink nonhomogenized milk is if you like the way it tastes and are willing to pay a premium price.