American cheese has a bad reputation because it’s not technically cheese in the traditional sense. It’s a processed product made by blending natural cheese with emulsifiers, preservatives, milk proteins, and colorings until the result bears little resemblance to the cheddar or colby it started from. The problems go beyond taste and texture: American cheese is significantly higher in sodium than natural cheese, contains phosphorus additives with real health concerns, and likely misses out on the cardiovascular benefits that actual cheese provides.
What’s Actually in American Cheese
A look at the ingredient list for Kraft Singles, the most recognizable American cheese brand, tells the story. It starts with cheddar cheese, which sounds promising, but then adds skim milk, whey, milk protein concentrate, calcium phosphate, sodium phosphate, modified food starch, sorbic acid as a preservative, and colorings like annatto extract and oleoresin paprika. That’s a long way from traditional cheese, which needs just milk, salt, cultures, and enzymes.
The FDA doesn’t even allow all versions of the product to use the word “cheese” on their own. Pasteurized process cheese must contain at least 30% fat and no more than 40% moisture. Products that fall short of those thresholds get downgraded to “pasteurized process cheese food” (at least 23% fat) or “pasteurized process cheese spread” (at least 20% fat, up to 60% moisture). Many of the individually wrapped slices people buy fall into the “cheese food” or “cheese product” categories, which is why their labels carefully avoid calling them cheese outright.
The Sodium Problem
One ounce of American cheese contains 468 milligrams of sodium. The same serving of cheddar has 185 milligrams. That means American cheese packs more than 2.5 times the sodium of a natural cheese, and most people don’t stop at a single ounce. Two slices on a sandwich can deliver close to a third of the recommended daily sodium limit before you’ve added any other ingredients.
That extra sodium isn’t just for flavor. Sodium-based emulsifying salts, primarily sodium citrate and sodium phosphate, are what give American cheese its signature melt. In natural cheese, calcium holds the protein molecules together in a rigid structure. The emulsifiers swap in sodium for that calcium, loosening the protein network so it flows smoothly when heated instead of separating into greasy clumps. It’s clever food science, and it’s the reason American cheese melts so well on burgers. But the tradeoff is a product loaded with sodium from multiple sources.
Phosphorus Additives and Health Risks
The sodium phosphate and calcium phosphate in American cheese introduce another concern. Inorganic phosphorus additives, the kind used in processed foods, are absorbed at rates above 90%. Phosphorus from natural food sources like meat, beans, and unprocessed dairy is absorbed at much lower rates, typically 20% to 60%. That difference matters because a rapid spike in blood phosphorus levels can disrupt the hormonal system that keeps phosphorus, calcium, and bone metabolism in balance.
For most healthy people eating moderate amounts, this isn’t an immediate crisis. But high phosphorus intake without enough calcium to offset it triggers the release of parathyroid hormone, which pulls calcium from bones to restore balance. Research on healthy young men showed that a high-phosphorus, low-calcium meal caused parathyroid hormone to spike at one and six hours after eating, with additional hormonal disruption lasting eight hours. When the same amount of phosphorus was paired with adequate calcium, those spikes were suppressed. The takeaway: phosphorus additives are less harmful when your overall diet includes plenty of calcium, but American cheese’s processing throws that ratio off compared to natural dairy products.
For people with chronic kidney disease, the stakes are higher. Reduced kidney function means the body can’t excrete excess phosphorus efficiently, so the buildup accelerates disease progression. Phosphorus additives have been linked to early kidney disease and declining filtration rates even in people who didn’t previously have kidney problems.
It Likely Misses the Health Benefits of Real Cheese
Here’s what might be the most surprising strike against American cheese. A 2023 review published in Advances in Nutrition pooled findings from dozens of observational studies and found that eating about 1.5 ounces of cheese per day was linked to a lower risk of heart disease, stroke, and death from cardiovascular causes. But Harvard Health Publishing specifically noted that American cheese was the exception. Because it’s labeled as “pasteurized process cheese” and contains added preservatives and colorings, it likely doesn’t deliver those same benefits. It’s not necessarily dangerous in small amounts, but choosing it over natural cheese means potentially missing out on a measurable protective effect.
Several randomized controlled trials have also found positive relationships between dairy intake and bone mineral density, but those benefits depend on consuming dairy with a favorable calcium-to-phosphorus ratio, the kind found in natural dairy products. The added phosphorus in processed cheese works against that balance.
Why It Melts So Well (and Why That’s the Point)
American cheese does one thing better than almost any natural cheese: it melts into a smooth, creamy layer without breaking or turning oily. That’s entirely by design. The sodium citrate in processed cheese replaces calcium in the protein structure, creating a more flexible matrix that flows evenly when heated. In many countries, this same chemical intervention means the product can’t legally be labeled as cheese at all.
This is why American cheese dominates fast food burgers, grilled cheese sandwiches, and diner breakfasts. Its popularity was never about quality or nutrition. It was about consistent texture, long shelf life, and industrial convenience. The individually wrapped slice was an engineering achievement, not a culinary one.
What About Lactose?
One area where American cheese isn’t significantly worse than natural cheese is lactose content. Both contain minimal amounts because the cheesemaking process consumes most of the lactose, and aging breaks down what’s left. Natural cheeses like cheddar and mozzarella have less than 1 gram of lactose per 1.5-ounce serving. American cheese, because it’s made from natural cheese as a base ingredient, also contains minimal lactose. If you’re lactose intolerant, American cheese isn’t likely to cause more digestive trouble than cheddar would.
Better Alternatives for the Same Uses
If you love the melt of American cheese, you can get close with young, high-moisture natural cheeses. Fontina, young gouda, and monterey jack all melt smoothly without the additive load. For an even closer match, some home cooks add a small amount of sodium citrate to grated natural cheese to create a processed-style melt from real ingredients, giving you the texture without the long ingredient list.
For everyday eating, swapping American cheese for cheddar cuts your sodium intake by more than half per serving while adding the cardiovascular benefits associated with natural cheese. Sharper aged cheddars deliver more flavor per ounce, so you may end up using less cheese overall. Swiss cheese is another strong option, with even lower sodium than cheddar and a calcium content that supports the favorable calcium-to-phosphorus ratio your bones need.