Pasteurized cheese is not bad for you. It delivers the same core nutrients as any cheese, including calcium, protein, and fat, while carrying a significantly lower risk of foodborne illness than raw (unpasteurized) varieties. Most cheese sold in grocery stores is made from pasteurized milk, and the heating process doesn’t strip away the nutritional value that makes cheese worth eating in the first place.
That said, “pasteurized cheese” can refer to very different products, from a block of aged cheddar to a plastic-wrapped slice of processed cheese food. The distinction matters more for your health than pasteurization itself does.
Natural Cheese vs. Processed Cheese
When people ask whether pasteurized cheese is bad for them, they’re often conflating two things: the pasteurization of milk (a safety step) and pasteurized process cheese (a product category). These are not the same.
A block of cheddar or a wheel of brie at your grocery store is almost certainly made from pasteurized milk. The milk is heated to kill harmful bacteria, then cultures are added, and the cheese is made through a traditional process of culturing, coagulating, and aging. The result is a whole food with a short ingredient list.
Pasteurized process cheese food, on the other hand, is a legally defined product. Under FDA standards, it’s made by grinding and melting one or more cheeses with additional dairy ingredients and optional additives into a smooth, uniform mass. It can contain up to 44% moisture and must have at least 23% fat. Products like individually wrapped cheese slices and some cheese spreads fall into this category. They tend to contain emulsifiers, added sodium, and other ingredients you won’t find in a block of natural cheese.
If you’re concerned about additives, the label tells you everything. A natural pasteurized cheese will list milk, cultures, salt, and enzymes. A processed cheese product will have a longer list. Both are safe to eat, but they’re nutritionally different products.
What Pasteurization Does (and Doesn’t) Change
Pasteurization heats milk enough to kill dangerous pathogens like E. coli, Listeria, and Salmonella. The CDC explicitly recommends choosing pasteurized dairy to reduce foodborne illness risk. In a 2024 E. coli outbreak linked to raw cheddar cheese, 70% of those sickened reported eating a specific brand of raw milk cheese, a rate far higher than the roughly 5% of the general population that eats any raw milk cheese at all.
Nutritionally, pasteurization leaves the important stuff intact. Minerals like calcium and phosphorus are heat-stable, and pasteurization does not appear to affect their bioavailability. You absorb the same amount of calcium from pasteurized cheese as you would from an unpasteurized version. Some heat-sensitive vitamins like B12 and folate can decrease slightly, but cheese is not a primary source of those nutrients anyway.
Pasteurized Cheese Still Contains Beneficial Bacteria
One common concern is that pasteurization kills all the “good” bacteria in cheese, removing potential gut health benefits. This isn’t quite right. Pasteurization does kill the bacteria in raw milk, but cheesemaking adds bacterial cultures back in after the milk is heated. Those cultures are what actually transform milk into cheese.
Research published in Foods found that low-fat cheddar cheese made from pasteurized milk contained approximately 100 million colony-forming units of lactic acid bacteria per gram, confirming high microbial viability throughout refrigerated storage. When fed to mice with human-like gut microbiomes, the starter cultures (Streptococcus and Lactococcus species) survived passage through the entire digestive tract and were markedly enriched in the gut. Both of these bacterial groups are known to have anti-inflammatory and immune-supporting properties. Pasteurized cheese, in other words, can still function as a source of live, beneficial microbes.
Inflammation and Heart Health
Cheese gets a bad reputation because of its saturated fat and sodium content, which raises fair questions about heart health. An ounce of cheddar, Swiss, or provolone contains around 5 grams of saturated fat. Mozzarella and goat cheese come in slightly lower at about 4 grams per ounce. Blue cheese, feta, and Parmesan tend to be higher in sodium, though their strong flavors mean most people use less of them.
But when researchers have looked at what cheese actually does to markers of chronic inflammation in the body, the results are reassuring. A large review of clinical trials found that dairy foods, including cheese, do not increase concentrations of biomarkers associated with chronic systemic inflammation. Multiple randomized controlled trials comparing high-dairy and low-dairy diets found no difference in C-reactive protein levels, a key blood marker for inflammation, regardless of whether participants ate low-fat or full-fat dairy. One study even found that women consuming a dairy-rich diet had lower levels of two inflammatory markers compared to a control diet. Out of 18 trials reviewed, every single one showed either no impact on inflammation or a mildly anti-inflammatory effect from dairy intake.
This doesn’t mean you should eat unlimited cheese. Saturated fat and sodium still matter for cardiovascular health, especially in large quantities. But moderate cheese consumption, even full-fat varieties, does not appear to drive the kind of chronic low-grade inflammation linked to heart disease and metabolic problems.
Lactose Content in Aged Cheeses
If you’re lactose intolerant, pasteurized cheese may actually be one of the easier dairy foods to digest. The aging process breaks down most of the lactose. Sharp cheddar contains only 0.4 to 0.6 grams of lactose per ounce, a fraction of the 12 or so grams in a cup of milk. Hard cheeses like Swiss and Parmesan are similarly low and generally don’t cause symptoms for most people with lactose intolerance. Softer, fresher cheeses like ricotta or cottage cheese retain more lactose and may be more likely to cause digestive discomfort.
What Actually Matters
The pasteurization step itself is a net positive: it makes cheese safer without meaningfully reducing its nutritional value or probiotic potential. The more relevant questions are about the type of cheese you’re eating and how much. A few ounces of natural aged cheese per day fits comfortably into most healthy diets. Heavily processed cheese products with long ingredient lists are a different story, not because of pasteurization, but because of what’s been added afterward.
Choosing cheese based on its ingredient list, sodium content, and how it fits into your overall diet will serve you far better than worrying about whether the milk was heated first.