Milk, the Modern Dairy Industry and American Health

How Industrialization Has Changed What We Drink

For many mature Americans, the milk they drank in their childhoods was a simple, healthy and fresh product. Dairies sold fresh milk from cows grazed in sunny fields that weren’t too far from home. That milk was sweet and alive with nutrients and enzymes. Processing was minimal, just pasteurization to kill bacteria capable of transmitting disease. 

But in this new millennium, the milk we’re buying is overwhelmingly ultra-pasteurized. What is the difference between raw, pasteurized and ultra-pasteurized milk? Are they all just as nutritious? Or is the processing all about keeping these products on grocery shelves for a longer time? And is milk harmed in this process? 

As a personal comment, I cringe when I see all this ultra-pasteurized milk. I have instinctively felt that the more our milk is heated or otherwise processed must damage it and make it less healthful. It might, I guessed, even make it damaging to health. So I decided to take a closer look. Let’s talk about modern milk. 

From Home Delivery to Plastic Bottles on Store Shelves

Originally, cows grazed on open pastures, ate a diversity of plants, and produced milk rich in fat‑soluble vitamins like A and D, as well as living enzymes that aided digestion. 

Delivery by horse-drawn milk carts was replaced by milk in glass bottles delivered by milkmen going door to door. As more homes added refrigerators, grocery stores began to stock milk in returnable glass bottles. In the 1960s, wax-coated cartons began to replace glass bottles. 

Gradually, dairies consolidated into larger, centralized operations. Milk needed to be shipped longer distances, stored longer, and made more shelf‑stable. The solution the industry settled on was ultra‑pasteurization.

What Is Ultra‑Pasteurization?

The original type of pasteurization (also called HTST for High-Temperature, Short-Time) heats milk to around 161°F (72°C) for 15 seconds. It has a shelf life of 10 to 21 days. 

Then two levels of ultra-pasteurization were instituted:

• Original ultra‑pasteurization heats milk to at least 280°F for two to four seconds. It has a shelf life of 30 to 60 days. 
• There is also Ultra-High Temperature (UHT) pasteurization which increases the temperature of milk to 280°F  to 300° for between one and five seconds. Milk undergoing UHT can be sealed into a sterile container and last for six months or more. 

How Ultra‑Pasteurization Changes Milk

The main proteins in milk are whey proteins and casein. Eighty percent of milk’s protein comes from casein. The remaining 20% comes from whey proteins which have a folded shape—that becomes important when pasteurization is involved. 

Proteins may be changed by heating, a change called denaturing. Denaturing changes the shape of proteins which can make them behave differently in the gut.

Here’s what happens with each type of pasteurization:

• Pasteurization: Casein is mostly unchanged. Some whey proteins unfold slightly and adhere to casein, which may slightly slow digestion and trigger inflammation in sensitive people.
• Ultra-pasteurization: Casein still remains mostly intact, but more whey proteins unfold more and more of it sticks to with casein. These larger protein clumps slow digestion more and may make immune reactions more likely.
• UHT (ultra-high temperature): Casein is altered a little, and nearly all whey proteins unfold and stick to casein. Some proteins also react with sugars in the milk. Digestion is slower, and these denatured proteins can provoke increasingly severe immune responses in people with sensitive guts.

Immune reactions can range from true allergies with symptoms like hives, swelling, itching and digestive upset to sensitivities manifesting as digestive discomfort, bloating, fatigue and inflammation. 

Minimal Heat Processing Protects Milk’s Benefits

Traditional‑food voices warn that heating affects how the body recognizes and digests these proteins, especially for people with gut sensitivity or an intestinal barrier that has been damaged, a condition referred to as leaky gut. For a person with a leaky gut, denatured proteins can more easily pass through the gut lining, thereby entering the bloodstream and triggering immune responses.

Industrial dairy critics emphasize that these heat treatments destroy enzymes and reduce certain vitamins, especially heat‑sensitive ones. One of the early advocates for consuming foods that have not been through this heating process was Dr. Weston A. Price. 

Dr. Price was a pioneering dentist and researcher who documented the robust health of traditional, minimally processed food cultures and argued that modern industrial diets contribute to chronic disease and degeneration. 

The Weston A. Price Foundation, established after his death, has carried on his work. They forward the following opinions about the problems that result from this heat: 

• Higher temperatures cause greater protein denaturation.
• More damage to fragile vitamins.
• Greater loss of bioactive compounds.
• Milk proteins attach to sugars in ways they normally wouldn’t.

Let’s look more closely at two of these points:

• Bioactive compounds benefit your body’s immune system, the strength of your gut lining and a healthy mix of microbes in the gut.
• When proteins attach to sugars, their structures change, so they can be harder to digest and utilize. In this process, the shape of certain amino acids, like the essential amino acid lysine, change and the body can’t use them as well. 

 Modern Dairy Industry and Traditional Food Advocates Disagree

It really isn’t shocking that the dairy industry has a different viewpoint than traditional food proponents. The dairy industry is focused on preventing the waste of their products and staying profitable. 

Traditional food advocates are focused on whether or not milk can still function as a living food — a term traditional‑food advocates use to describe foods with intact enzymes and the friendly bacteria naturally present in milk. Dr. Price described traditional, whole, raw milk as an exceptionally nutrient-dense food, emphasizing its ample supply of fat-soluble vitamins, proteins, and minerals.

With all the changes in the dairy industry, we no longer have easy access to this food in its original form in our grocery stores. For babies and children who rely heavily on milk, this change may have significant impacts. The question of which type of milk to drink is not easy to answer with current, readily-available science. For the time being, the decision is yours based on your knowledge and values.

In closing: Pasteurization is only one of the possible issues with modern milk. There’s also the addition of synthetic vitamins and a number of other artificial substances added to flavored milk, cream, creamers, ice cream and more. More on this later.