Pasteurized processed cheese is a dairy product made by grinding and melting one or more natural cheeses together with emulsifying salts, then heating the mixture to at least 165°F for 30 seconds to create a smooth, uniform product. It’s the cheese behind individually wrapped slices, shelf-stable cheese dips, and the reliably melty cheese on fast-food burgers. Unlike natural cheese, which is simply milk transformed by bacteria and enzymes, processed cheese is engineered from already-made cheese to behave consistently every time you melt it.
How It’s Made
The process starts with natural cheese. Manufacturers select cheeses of different ages and varieties, often cheddar, and shred or grind them together. This blend gets heated into a molten mass while emulsifying salts, typically sodium citrate or sodium phosphate, are stirred in. Those salts are the key to everything that makes processed cheese different from the cheese it’s made from.
In natural cheese, the proteins clump together in a matrix that traps fat and water in separate pockets. When you melt natural cheddar, the fat often separates out into a greasy puddle while the protein turns rubbery. Emulsifying salts break apart the protein clumps and redistribute them so they surround tiny droplets of fat evenly, creating a stable oil-in-water emulsion. The result is a product that melts into a smooth, creamy texture without separating. Different emulsifying salts produce slightly different results: sodium citrate tends to yield a whiter cheese, while other phosphate-based salts affect how firm or spreadable the final product is.
After heating and emulsifying, the molten cheese is poured into molds, sliced, or packaged. The pasteurization step kills bacteria that would cause spoilage in natural cheese, giving the product a much longer shelf life. A block of natural cheddar might last a few weeks in your fridge before developing mold, while an unopened package of processed cheese can last months.
What’s Actually in It
By federal regulation, pasteurized process cheese must contain real cheese as its primary ingredient. It cannot be made from cream cheese, cottage cheese, or hard grating cheeses like Parmesan. Beyond the cheese base and emulsifying salts, manufacturers can add cream, milk, skim milk, buttermilk, cheese whey, and anhydrous milkfat. Acidifying agents like vinegar, lactic acid, or citric acid may be used to adjust the pH. Artificial coloring, often annatto (which gives cheddar its orange hue), is also permitted.
The FDA sets specific composition standards. Pasteurized process cheese can contain no more than 43 percent moisture, and the fat content of the solids must be at least 47 percent. These numbers ensure the product has enough real cheese character to earn the name “cheese” on its label rather than being classified as something else entirely.
Process Cheese vs. Cheese Food vs. Cheese Spread
The labels on processed cheese products are legally distinct categories, not interchangeable marketing terms. “Pasteurized process cheese” has the strictest composition requirements: the most cheese, the least moisture, and the highest fat content. “Pasteurized process cheese food” allows more moisture, more non-cheese dairy ingredients like whey, and a lower percentage of actual cheese. “Pasteurized process cheese spread” goes further still, permitting even higher moisture levels, additional sweeteners, and a softer, more spreadable consistency.
This is why some familiar products you might think of as “cheese” are actually labeled “cheese product” or “cheese food” if you look closely at the packaging. Kraft Singles, for instance, no longer meets the standard to be called pasteurized process cheese and is labeled as a “pasteurized prepared cheese product.” The distinction matters if you care about how much real cheese is in what you’re eating.
Nutrition Compared to Natural Cheese
The most significant nutritional difference between processed and natural cheese is sodium. Processed cheese averages about 1,242 mg of sodium per 100 grams, roughly double the 615 mg found in the same amount of natural cheddar. Some brands push even higher, with label values reaching 1,740 mg per 100 grams. That extra sodium comes from the emulsifying salts, added salt for flavor, and the sodium-based preservatives that extend shelf life.
Protein and calcium are generally comparable to natural cheese, though the exact amounts depend on how much of the product is actual cheese versus added dairy ingredients like whey. A slice of processed American cheese typically delivers around 5 grams of protein and a modest amount of calcium, but less of both than an equivalent weight of aged cheddar. If you’re watching your sodium intake, this is where processed cheese becomes a real concern: two slices on a sandwich can deliver over 400 mg of sodium before you’ve added anything else.
Why It Melts So Well
The uniform melt is the whole reason processed cheese exists. When emulsifying salts redistribute the proteins during manufacturing, they create a structure where fat droplets are evenly suspended throughout the cheese, typically between 2.7 and 3.3 micrometers in size. This means that when heat is applied, the fat softens uniformly and the proteins stretch into that familiar smooth, flowing consistency rather than clumping or separating.
This property makes processed cheese the default choice for cheeseburgers, grilled cheese sandwiches, and cheese sauces where consistent texture matters more than complex flavor. Natural cheeses can achieve similar results, but they require more careful handling. You need to shred them finely, melt them slowly, and sometimes add your own sodium citrate to prevent breaking. Processed cheese does all of that work for you at the factory.
What “Pasteurized” Actually Means Here
The “pasteurized” in the name refers to the heating step during manufacturing, not the pasteurization of the milk used to make the original cheese (though that milk is almost always pasteurized too). The cheese blend must reach at least 165°F and hold that temperature for a minimum of 30 seconds. This kills spoilage bacteria and pathogens, which is why processed cheese is considered safe for people who are advised to avoid soft or unpasteurized cheeses, such as pregnant women.
The pasteurization step also halts the aging process of the natural cheeses used as ingredients. In natural cheese, enzymes and bacteria continue to develop flavor over time. Once those cheeses are melted and pasteurized into a processed product, that biological activity stops. The flavor is locked in at whatever point the source cheeses had reached, which is one reason processed cheese tastes milder and less complex than aged natural cheese.