Raw Milk Is Trending. Here's What It Actually Risks

Scroll through wellness content for ten minutes and you will probably meet someone holding a glass bottle of raw milk. The pitch is consistent: this is milk the way it used to be, before it was processed, stripped, and denatured. The enzymes are intact. The good bacteria are alive. It even fixes lactose intolerance, apparently.

The interest is real. According to market data from NielsenIQ cited by the Center for Science in the Public Interest, raw milk sales rose 20 to 65 percent year over year in 2024. And a lot of people genuinely do not know what they are choosing. In a June 2024 survey of 1,031 US adults by the Annenberg Public Policy Center, only 47% understood that raw milk is less safe than pasteurized milk, and only 43% correctly knew that pasteurization does not destroy milk's nutrients.

So let's go through it properly. Not "raw milk bad, drink your pasteurized milk" — but claim by claim, with what the actual research shows. One of these claims turns out to be more interesting than its critics admit. The rest do not survive contact with the evidence, and the risk side has genuinely changed since 2024.

First: what pasteurization actually is

Most of the argument against pasteurization assumes it is something harsher than it is. It is worth knowing the numbers.

Pasteurization is, as the International Dairy Foods Association puts it, "a process, named after scientist Louis Pasteur, that applies heat to destroy pathogens in foods." The dominant method in the US is High Temperature Short Time (HTST), which raises milk "to at least 161° F for not less than 15 seconds, followed by rapid cooling." The older batch method holds milk at 145°F for 30 minutes.

That is it. Fifteen seconds at a temperature below boiling. It is closer to a very quick scald than to anything you would call industrial processing. It does not sterilize the milk either — pasteurized milk still goes sour in your fridge, because pasteurization targets pathogens, not every microbe present. And it is not a modern invention imposed on a trusting public. It became widespread because milk used to kill people, particularly children, on a scale that is hard to imagine now.

Claim 1: "Raw milk is more nutritious"

This is the easiest one to check, because nutrients in milk are measurable and have been measured repeatedly.

Milk's minerals — calcium, phosphorus, magnesium, potassium — are not affected by heat at all. Minerals do not denature. Protein content is unchanged. The fat is unchanged. What heat can touch is a handful of heat-sensitive vitamins, and the losses there are small in absolute terms because milk was never a major source of most of them in the first place.

The organizations that have reviewed this all land in the same place. The Academy of Nutrition and Dietetics states plainly that "Pasteurization does not negatively affect the nutritional quality of milk. Changes to vitamin and mineral content are minimal." The American Academy of Pediatrics quotes Dr. Robert Frenck, chair of its Section on Infectious Diseases: "Pasteurized milk provides all the nutritional benefits of milk while eliminating harmful bacteria." The CDC's position is the same — that pasteurized milk offers the nutritional benefits of milk without the risk.

If you want a practical version of this: if you poured a glass of raw milk and a glass of pasteurized whole milk from the same herd and ran both through a nutrition panel, the difference would be a rounding error against what you get from the rest of your day's food. Nobody's diet is being rescued or ruined by the vitamin B2 delta between two glasses of milk.

Claim 2: "Raw milk cures lactose intolerance"

This one has an unusually clean answer, because someone actually ran the experiment.

Researchers at Stanford recruited adults with lactose intolerance confirmed by hydrogen breath testing, then had them drink raw milk, pasteurized milk, and soy milk in randomized order across three 8-day phases, with washout periods in between. The milks came in unlabeled containers with a little vanilla syrup added so participants could not tell which was which. Doses escalated from 4 ounces up to 24 ounces. The results were published in the Annals of Family Medicine in 2014.

There was no difference. Participants rated their discomfort at an average of 4 on a 10-point scale on 24 ounces of either dairy milk. Lead investigator Christopher Gardner, PhD, put it about as bluntly as researchers get: "It's not that there was a trend toward a benefit from raw milk and our study wasn't big enough to capture it; it's that there was no hint of any benefit."

The reason is mechanical. The claim rests on the idea that raw milk contains lactase, the enzyme that breaks down lactose, and that pasteurization destroys it. But milk does not meaningfully contain lactase in the first place. In an AAP FactCheck review of the claim, Dr. Evangeline Mantzioris of the University of South Australia said simply: "Milk doesn't contain lactase, we make lactase." Professor Jennie Brand-Miller of the University of Sydney added that "There is no lactase in milk that's of any physiological significance," and that it would make "not one iota of difference for someone with lactose intolerance."

Raw and pasteurized milk contain the same lactose. Heat does not change sugar into something easier to digest. If dairy bothers you, lactase drops, lactose-free milk, aged hard cheeses, and fermented dairy are all real solutions. Raw milk is not one of them.

Claim 3: "Raw milk is full of beneficial probiotics and enzymes"

Raw milk does contain bacteria. That is not the same as containing probiotics.

A probiotic is a specific, characterized strain shown to survive stomach acid and confer a benefit. The bacteria that show up in raw milk are whatever happened to be in the environment during milking — mostly spoilage organisms, sometimes pathogens, and not the well-studied strains you find in a live-culture yogurt. The Academy of Nutrition and Dietetics is direct about it, citing the FDA: "there is currently no evidence of beneficial bacteria in raw milk," and noting that the bacteria in raw milk are not typically probiotic, unlike the cultures in yogurt and kefir made from pasteurized milk.

The "living enzymes" argument runs into a separate problem: your stomach. Dietary enzymes from food are proteins, and proteins get denatured by stomach acid and chopped up by your own digestive enzymes. Whatever enzymes survive the udder do not survive your gastric juice intact and go on to do useful work downstream.

Here is the frustrating part of this claim, though: the underlying instinct is right. Live, fermented dairy really does appear to do something for the gut — it is just that raw milk is not the way to get it. More on that below.

Claim 4: "Raw milk protects kids from asthma and allergies"

This is the claim that deserves more respect than it usually gets from either side, and it is worth being honest about.

There is a real, replicated finding here. The GABRIELA study surveyed parents of 8,334 school-aged children in rural Germany, Austria, and Switzerland, collected serum from 7,606 of them, and analyzed 800 milk samples. Children who drank unheated farm milk had lower odds of asthma (adjusted odds ratio 0.59, 95% CI 0.46-0.74), atopy (0.74, 0.61-0.90), and hay fever (0.51, 0.37-0.69). Notably, "boiled farm milk did not show a protective effect" — which is why this is not simply a "farm kids are healthier" artifact. Later work from the same research group pointed at specific components, including higher levels of omega-3 fatty acids and particular whey proteins in unprocessed milk.

So the effect looks real. But look closely at what it is an effect of. This is early-life exposure, in infants and young children, on working farms, to milk from a herd their family knows, in a context with a dozen other farm exposures. It is observational data, not a randomized trial. And it says nothing about a 34-year-old in Ohio buying a bottle of raw milk at retail — nobody has shown that adult raw milk consumption does anything for adult allergies.

Most importantly: the researchers who found this effect are the loudest people warning you not to act on it. Erika von Mutius, the LMU Munich epidemiologist who has led much of this work, is unambiguous: "Direct consumption of raw milk as a precaution against allergies cannot be recommended, as untreated milk may contain pathogenic microorganisms." Her team has spent years working with a dairy cooperative to develop a gentler processing method that keeps the beneficial components while removing the dangerous bacteria, and is now running the MARTHA trial to test that minimally processed milk against ordinary UHT milk in infants. The researchers behind the related PASTURE cohort work took the same line, declining to recommend untreated milk "since it may contain pathogenic micro-organisms" and arguing instead for milder processing methods.

In other words: the scientists who produced the single best piece of evidence in raw milk's favor read that evidence as a reason to invent a safer milk, not as a reason to drink an unsafe one.

Now the risk side, in numbers

Raw milk can carry Salmonella, Campylobacter, Shiga toxin-producing E. coli (including O157:H7), and Listeria. These are not theoretical. Cows can shed pathogens while appearing completely healthy, and manure contamination during milking does not require a dirty farm — just an ordinary one.

The clearest single comparison comes from a 2017 analysis in the CDC journal Emerging Infectious Diseases, which modeled US dairy outbreaks from 2009 to 2014. Per unit consumed, unpasteurized dairy caused 840 times more illnesses (95% credible interval 611-1,158) and 45 times more hospitalizations (34-59) than pasteurized dairy. The headline finding is the one worth sitting with: unpasteurized milk, "consumed by only 3.2% of the population, and cheese, consumed by only 1.6% of the population, caused 96% of illnesses caused by contaminated dairy products."

A longer view from a study in Epidemiology & Infection counted 202 outbreaks linked to unpasteurized milk between 1998 and 2018, causing 2,645 illnesses, 228 hospitalizations, and 3 deaths. In the 2013-2018 subset, 48% of illnesses were in people aged 0-19, and 14% were in children under 5. The same analysis found that jurisdictions permitting raw milk sales had 3.2 times more outbreaks than those prohibiting them.

And this is not history. In 2025, the Florida Department of Health reported 21 cases of Campylobacter and STEC infection tied to a single New Smyrna Beach dairy, including six children under 10 and seven hospitalizations. A separate multistate E. coli O157:H7 outbreak linked to raw milk cheddar from California's largest raw dairy ran from September 2025 to February 2026, sickening nine people across three states — more than half of them under 5 — with three hospitalizations and one case of hemolytic uremic syndrome, the kidney-failure complication that is the reason pediatricians treat STEC in small children as an emergency.

The new variable: H5N1

Since March 2024, there has been a risk on the table that simply did not exist when most people formed their opinion about raw milk. Highly pathogenic avian influenza H5N1 spread into US dairy herds, and it turned out to concentrate in the udder — infected cows shed enormous quantities of virus into their milk while often looking fine.

How widespread was it? CDC researchers testing retail milk found viral RNA in 36.3% of pasteurized retail samples between April 13 and May 3, 2024, falling to 6.9% by late 2024 and early 2025. Crucially, they found "no evidence of viable virus in IAV-positive retail milk samples." Pasteurization worked. The RNA was debris from a virus that had already been killed.

Raw milk is a different story. Research on virus stability in milk from infected cows found that infectious H5N1 remained detectable in raw milk stored at refrigerator temperature (4°C) for at least 5 weeks, and in extended analysis "for up to 22 weeks." Interestingly, virus artificially spiked into healthy cows' milk died off within about two weeks — the virus produced in the mammary gland itself was far more stable. The authors concluded that "persistence of infectious viruses in raw milk highlights the potential risk of transmission through unpasteurized dairy products, both for humans and domesticated animals."

The animal half of that sentence is no longer hypothetical. In November and December 2024, indoor-only house cats in Los Angeles County that drank recalled raw milk got sick; two died within days of symptom onset, and a third survived only after hospitalization, antivirals, and weeks of neurological symptoms including blindness and hind limb paralysis.

Being fair about the human side: to date, no human H5N1 case has been definitively attributed to drinking raw milk. Confirmed human infections have overwhelmingly been in dairy and poultry workers with direct animal exposure, and have mostly been mild. The infectious dose for humans by the oral route is unknown. That is a genuine uncertainty, and it cuts both ways — "no confirmed cases yet" is not the same as "safe," particularly for a virus whose behavior in a new host species we are still learning.

One more honest note on pasteurization itself: a 2024 laboratory study of heat inactivation found H5N1 dropped roughly 10,000-fold within five seconds at 72°C, but detected very small amounts of infectious virus after up to 20 seconds in one of three samples with extremely high starting virus levels. The researchers stressed those were controlled bench conditions, not commercial pasteurization equipment, and should not be used to draw conclusions about the milk supply. Real-world FDA testing of hundreds of pasteurized retail dairy products has not turned up viable virus.

Who should absolutely not drink it

Every organization that has looked at this converges on the same list, because these are the groups where a foodborne infection stops being a bad week and becomes a hospitalization:

• Children, especially under 5 — they are dramatically overrepresented in raw milk outbreaks and are the group most likely to develop hemolytic uremic syndrome from STEC.
• Pregnant women — Listeria can cross the placenta and cause miscarriage, stillbirth, or severe neonatal infection, and pregnancy itself raises listeriosis risk substantially.
• Adults over 65 and anyone immunocompromised — chemotherapy, transplant medication, HIV, autoimmune treatment, poorly controlled diabetes.

It is also worth knowing that "I trust my farmer" is not a control measure in the way people hope. Testing is intermittent, shedding is intermittent, and a clean, well-run farm with healthy-looking cows has produced multiple outbreaks. The Florida health department's note on the 2025 outbreak is telling: sanitation was flagged only after 21 people got sick.

If what you actually want is better dairy

Here is the thing. The impulse behind raw milk is usually a good one: less processing, more living food, more real ingredients. That instinct is worth keeping. Raw milk is just a poor way to spend it — a large, well-documented risk in exchange for benefits that mostly do not exist.

If you want the actual version of what raw milk promises, it is fermented dairy, and the evidence there is much stronger. In a 10-week randomized trial at Stanford published in Cell, 36 healthy adults were assigned to either a high-fermented-food diet (yogurt, kefir, fermented cottage cheese, kimchi, vegetable brine drinks, kombucha) or a high-fiber diet. The fermented-food group showed increased gut microbial diversity, with bigger effects at bigger servings, and 19 inflammatory proteins decreased — including interleukin-6. None of those markers dropped in the high-fiber group over that timeframe. Justin Sonnenburg, PhD, called it "a stunning finding... one of the first examples of how a simple change in diet can reproducibly remodel the microbiota across a cohort of healthy adults."

Those foods are made with pasteurized milk. The live cultures are added deliberately, in known strains, after the pathogens are gone. You get the microbes without the roulette. If you want to go deeper on which ones do what, we have a full breakdown of kimchi, kefir, and kombucha and a beginner's guide to getting started with fermented foods.

Beyond that, if the goal is milk that is closer to the farm: look for grass-fed, non-homogenized, or low-temperature vat-pasteurized milk from a local creamery. All of those are real differences you can taste, and none of them require pathogen exposure. And if the deeper motivation is eating fewer ultra-processed foods, it is worth pointing out that pasteurized milk is not an ultra-processed food. It is milk that spent fifteen seconds warm. The ultra-processed items in a typical American diet are elsewhere entirely — and that is a far more useful place to direct the same energy.

How to actually build fermented foods into a week

Knowing kefir is good for you and getting kefir into your Tuesday are different problems. This is the gap where most nutrition advice quietly dies.

A few things that make it stick:

• Attach it to something you already do. Plain yogurt as the base for a smoothie you were making anyway. Kefir instead of milk in overnight oats. A forkful of sauerkraut next to whatever protein is already on the plate.
• Buy for "live and active cultures." Shelf-stable pickles in the vinegar aisle are not fermented. Check the refrigerated section and the label.
• Small and daily beats heroic and occasional. The Stanford trial's dose-response pattern suggests consistency matters more than any single big serving.
• Count the diversity, not just the dairy. Yogurt, kefir, kimchi, sauerkraut, miso, and tempeh all contribute different organisms and different plants.

That last point is where a bit of tracking helps more than willpower does. In Eat Well Planner, Plant Points tracks how many different plants you have eaten toward the 30-a-week target that microbiome research points to, which turns "eat more variety" into a number you can actually see moving. The Nutrition Score and plain-language nutrient highlights on every recipe let you check whether a meal delivers what you think it does, and Make It Healthier suggests specific ingredient swaps with the nutritional gain verified by a calculator first — so you get "swap this for that, here is what it is worth" rather than vague advice. Build a week of meals that includes fermented foods, and the shopping list writes itself, which is usually the step where good intentions fall apart.

The short version

Pasteurization is fifteen seconds of gentle heat that does not meaningfully change milk's nutrition, does not affect lactose tolerance, and does not remove probiotics that were never there. The one claim with real science behind it — early-life farm milk and childhood allergy — comes from researchers who explicitly tell you not to drink raw milk, and who are building a safer alternative instead.

Meanwhile the risk is measurable, it falls hardest on children, and since 2024 it includes a virus that stays infectious in cold raw milk for months. If you want living cultures, fermented dairy has better evidence and no pathogen roulette. If you want milk closer to the farm, grass-fed and gently pasteurized will get you there. Raw milk asks you to accept a well-documented downside for an upside that mostly is not real.

The instinct to eat more real food is a good one. It just deserves to be spent somewhere it pays off.