Most natural cheese contains surprisingly little sugar. Milk starts out with roughly 4 to 5 percent lactose, but the cheesemaking process consumes, drains, or ferments the vast majority of it. A well-aged cheddar or Parmesan can have less than a tenth of a milligram of lactose per hundred grams, while a fresh ricotta retains noticeably more. The spread across cheese types is enormous, and the details matter if you are watching sugar intake or managing lactose intolerance.
How Cheesemaking Strips Sugar Out of Milk
The sugar in cheese is almost entirely lactose, the natural sugar present in mammalian milk. Cow’s milk typically contains about 4.7 percent lactose, while sheep and goat milk come in slightly lower, around 4.6 and 4.3 percent respectively.1International Dairy Journal. Physical and chemical characteristics of sheep and goat milk in Austria That is the starting material. What happens next is what determines whether your finished cheese has any meaningful sugar at all.
On the first day of cheesemaking, bacteria convert lactose into lactic acid. This fermentation step is the single biggest reason cheese ends up low in sugar.2PubMed. The Basics of Cheesemaking The lactic acid bacteria used as starter cultures acidify the milk, which helps the curd form and also gives cheese much of its flavor.3PubMed Central. Lactic Acid Bacteria in Raw-Milk Cheeses: From Starter Cultures to Probiotic Functions Once the curd separates from the liquid whey, a large portion of the remaining lactose drains away with the whey. Whatever lactose survives both fermentation and drainage then continues to be consumed by bacteria during ripening and aging. The longer a cheese ages, the more time bacteria have to eat through any residual sugar.
This three-stage process explains the general pattern: hard, long-aged cheeses are almost sugar-free, while fresh cheeses that skip the aging step retain more.
Aged Hard Cheeses Are Practically Sugar-Free
If you eat Parmesan, aged cheddar, Comté, Gruyère, or similar hard cheeses, you are consuming a food with essentially zero sugar. Research using highly sensitive analytical methods has confirmed this in detail. When scientists tested 25 European PDO cheeses using techniques with detection limits below 10 milligrams per kilogram, the majority came back with lactose levels below the instruments’ ability to quantify.4PubMed Central. Lactose Residual Content in PDO Cheeses: Novel Inclusions for Consumers with Lactose Intolerance That is a vanishingly small amount, far below what would register on any nutrition label.
A separate analysis focusing specifically on cheddar, Comté, and Swiss fondue cheese confirmed the picture. All cheddar varieties tested had lactose and galactose below 10 milligrams per 100 grams. Comté samples had lactose below the detection limit entirely, with only traces of galactose ranging from undetectable up to about 1.9 milligrams per 100 grams. Swiss fondue cheese similarly showed no measurable lactose and only 2 to 3 milligrams of galactose per 100 grams.5PubMed Central. The Lactose and Galactose Content of Cheese Suitable for Galactosaemia: New Analysis To put that in perspective, a glass of milk contains around 12 grams of lactose. A serving of aged cheddar contains roughly a thousandth of that, or less.
The validated chromatographic methods used in these studies can correctly measure lactose, glucose, and galactose at concentrations below 1 milligram per 100 grams of cheese.6Food Chemistry. Lactose, galactose and glucose determination in naturally “lactose free” hard cheese: HPAEC-PAD method validation The fact that aged cheeses often come back below even those thresholds tells you just how thoroughly the fermentation and aging process eliminates sugar.
Blue and Mold-Ripened Cheeses
Blue cheeses might seem like a wild card because of their distinctive ripening process, but they follow the same basic pattern as other aged cheeses. Gorgonzola, one of the best-known blue cheeses, has been tested extensively. Across 49 samples, researchers found lactose levels of about 1.2 milligrams per 100 grams in the sweet variety and 0.7 milligrams per 100 grams in the piquant variety. Small amounts of galactose and glucose were also detected, but the total sugar content remained negligible. Analysis of cheese cores taken at different stages of ripening showed that sugars were completely metabolized within 10 days of production, leading the researchers to conclude that Gorgonzola qualifies as “naturally lactose free.”7International Dairy Journal. Study on the sugar content of blue-veined “Gorgonzola” PDO cheese
Other mold-ripened cheeses like Brie and Camembert have not been studied with quite the same rigor in the published literature, but their production process is similar enough to predict low residual sugar. They are aged for weeks, during which surface molds and bacteria continue metabolizing any leftover lactose. You should not expect them to be completely sugar-free the way a two-year Parmesan is, but they are still in the range of a gram or less per serving.
Fresh Cheeses Retain the Most Sugar
Fresh, unripened cheeses are where sugar content starts to climb in meaningful ways. These include cottage cheese, cream cheese, ricotta, queso fresco, and mascarpone. Because they undergo little or no aging, the bacteria do not have weeks or months to finish consuming the lactose. And because some fresh cheeses retain a higher proportion of whey, more lactose sticks around in the final product.
Ricotta is a useful example. It is technically a whey cheese, made by reheating the liquid left over after making other cheeses. A comparison of whey cheeses found that ricotta had higher levels of lactose than urda, a similar Eastern European whey cheese.8Macedonian Veterinary Review. Comparison of the Chemical Composition of Whey Cheeses: Urda And Ricotta In practical terms, a half-cup serving of ricotta can contain anywhere from 2 to 6 grams of sugar depending on the brand and whether it is whole-milk or part-skim. Cottage cheese often falls in a similar range, with 3 to 6 grams per serving, most of it lactose.
Cream cheese sits somewhere in the middle. It is cultured but only briefly aged, so it retains some lactose. A typical serving of about 30 grams (two tablespoons) has less than a gram of sugar. Mascarpone, which is made by acidifying cream rather than relying on bacterial fermentation, also keeps a small but noticeable amount of lactose.
Brown Whey Cheese Is an Outlier
If you have ever encountered Brunost, the caramel-brown Norwegian cheese, you know it tastes sweet. That is not your imagination. Brown whey cheese is made by boiling whey with added milk and cream until the mixture reduces and caramelizes. Rather than draining away lactose with the whey, this process concentrates it. The result is a dense, fudge-like product with a distinctly sweet, cooked flavor.
Brunost can contain upward of 35 to 40 grams of sugar per 100 grams, which puts it closer to a candy bar than to a typical cheese in terms of sugar content. Most of that sugar is lactose, along with some galactose produced during the heating process. If you are tracking sugar, this is the cheese type that would genuinely surprise you on a nutrition label. It is popular in Scandinavian countries sliced thin on toast or crackers, and its sweetness is the whole point.
Flavored and Processed Cheeses Can Be Sugar Traps
Plain, unprocessed cheese rarely contains added sugars. But flavored dairy products, including some cheese spreads and dessert cheeses, are a different story. Research on flavored dairy products found a wide range of sugars present, including fructose at 0.7 to 4.1 grams per 100 grams, glucose at 0.2 to 4.0 grams, sucrose at 3.7 to 10.6 grams, and lactose at 1.8 to 5.2 grams.9International Dairy Journal. Sugars in dairy products of different flavours That sucrose figure is telling. Plain cheese has no sucrose at all because sucrose does not naturally occur in milk. When you see sucrose in a flavored cheese product, it was added during manufacturing.
Processed cheese slices and spreads often contain added ingredients like whey powder, milk solids, or modified starches that can bump up the sugar content compared to natural cheese. A typical American cheese slice might have 1 to 2 grams of sugar per slice, which is not dramatic but is higher than you would get from the same weight of natural cheddar. Cheese-based dips and spreads flavored with herbs, fruits, or sweeteners can reach even higher numbers.
The practical takeaway is to check the ingredients list, not just the nutrition panel. If you see sucrose, dextrose, corn syrup, or fruit preparations listed, those are added sugars that have nothing to do with the normal sugar content of cheese.
Plant-Based Cheese Alternatives
If you have switched to plant-based cheese, the sugar picture is different but often favorable. A survey of commercially available non-dairy cheese alternatives found that 98 percent of the products tested contained 1 gram of sugar or less per serving.10PubMed Central. Nutritional Profiles of Non-Dairy Plant-Based Cheese Alternatives Since these products contain no lactose (they are made from nuts, coconut oil, soy, or starches), whatever sugar they do contain comes from added sweeteners or the natural sugars in their plant-based ingredients.
That said, plant-based cheeses come with their own nutritional trade-offs. Many are lower in protein than dairy cheese and higher in sodium and saturated fat from coconut oil. The low sugar content is a genuine advantage for people avoiding lactose or watching total sugar, but it does not make them nutritionally equivalent to dairy cheese across the board.
Why Leftover Sugar Changes How Cheese Cooks
There is a practical consequence to residual sugar in cheese that has nothing to do with nutrition. If you have ever wondered why some mozzarella browns beautifully on a pizza while other batches barely change color, sugar is the answer. Specifically, galactose, which is one of the two simple sugars that lactose breaks down into during fermentation.
Researchers demonstrated this by making mozzarella with two different bacterial cultures. One culture released appreciable galactose into the cheese curd, while the other did not. The cheeses were otherwise identical in composition, but they browned at significantly different rates during high-temperature pizza baking.11Journal of Dairy Science. Browning of Mozzarella Cheese During High Temperature Pizza Baking A follow-up study confirmed that cheese made with cultures producing less galactose showed reduced browning on pizza, directly tying the browning reaction to galactose levels.12Utah State University DigitalCommons. Understanding the Pizza Baking Properties of Low Moisture Part Skim (LMPS) Mozzarella Cheese
This is a Maillard reaction, the same chemical browning that gives bread crusts and seared steaks their color and flavor. In cheese, galactose reacts with amino acids at oven temperatures to produce those appealing golden-brown spots. Pizza makers and cheesemakers have long understood this relationship intuitively, but the controlled experiments confirmed that galactose content is the key variable. If you have ever noticed that fresh mozzarella barely browns compared to low-moisture mozzarella, this is part of the reason: fresh mozzarella has higher moisture and different sugar profiles.
What This Means for Lactose Intolerance
People with lactose intolerance often avoid cheese entirely, which in many cases is unnecessary. The threshold at which lactose triggers symptoms varies from person to person, but most people with lactose intolerance can handle 12 grams or less in a sitting without significant discomfort. A serving of aged cheddar, Parmesan, or Comté contains a fraction of a milligram. Even relatively high-lactose cheeses like cottage cheese deliver only 3 to 6 grams per half cup, which many lactose-intolerant people tolerate without trouble.
The cheeses to be cautious about are fresh, unripened varieties and anything made from concentrated whey. Ricotta, cottage cheese, and especially brown whey cheese like Brunost carry enough lactose to potentially cause symptoms in sensitive individuals. But if you have been avoiding a cheese board out of fear, knowing that hard and aged cheeses are essentially lactose-free might broaden your options considerably.
For the much rarer condition of galactosemia, where the body cannot properly metabolize galactose, the picture requires more care. Even though aged cheeses contain almost no lactose, some retain trace amounts of galactose. The cheddar and Comté analyses mentioned earlier found galactose residues ranging from undetectable to about 12.65 milligrams per 100 grams, depending on the specific product and batch.5PubMed Central. The Lactose and Galactose Content of Cheese Suitable for Galactosaemia: New Analysis Whether those trace amounts matter depends on the severity of the condition and should be discussed with a specialist.
Prehistoric Cheesemaking and the Lactose Connection
The relationship between cheese and sugar has a deep evolutionary dimension. Archaeological evidence from the Dalmatian coast shows that humans were making cheese thousands of years before lactose tolerance genes became common in European populations.13Current Biology. On the origins of cheese This makes sense when you consider how dramatically cheesemaking reduces lactose. Early humans who could not digest lactose in liquid milk could still eat cheese and get the calories, fat, and protein from milk without the digestive consequences.
In other words, cheesemaking may have been one of the earliest food-processing technologies specifically because it solved the lactose problem. Turning milk into cheese was not just a preservation technique; it was a way to unlock a calorie-dense food source for populations that were largely lactose intolerant. The subsequent spread of lactose tolerance genes through European populations happened over thousands of years, likely driven in part by the nutritional advantage of being able to consume dairy in all its forms. But cheese came first, and its naturally low sugar content is precisely what made that possible.
A Quick Reference by Cheese Type
Because the numbers are scattered across studies using different methods and units, here is a rough guide based on the available research and standard nutrition data:
- Hard aged cheeses (Parmesan, aged cheddar, Comté, Gruyère, Emmental): less than 0.5 grams per 100 grams, often undetectable
- Semi-hard cheeses (Gouda, Edam, Manchego, provolone): generally under 1 gram per 100 grams, decreasing with age
- Blue cheeses (Gorgonzola, Roquefort, Stilton): well under 1 gram per 100 grams, typically a few milligrams total sugars
- Soft ripened cheeses (Brie, Camembert): roughly 0.5 to 1 gram per 100 grams
- Fresh unripened cheeses (ricotta, cottage cheese, cream cheese, queso fresco): 1 to 6 grams per 100 grams depending on type and brand
- Brown whey cheese (Brunost): 35 to 40 grams per 100 grams
- Processed cheese products (American slices, cheese spreads): 2 to 5 grams per 100 grams, sometimes higher with added sugars
- Flavored cheese products (fruit-flavored spreads, dessert cheeses): up to 10 grams or more per 100 grams from added sucrose and fruit sugars
- Plant-based alternatives: typically 1 gram or less per serving
These ranges reflect the general landscape, but individual products vary. A three-month cheddar will have more residual lactose than a two-year cheddar. A ricotta made from whole milk will differ from one made from part-skim. And any flavored or processed product can shift the numbers substantially depending on the ingredient list. When precise sugar content matters for your health, the nutrition label on the specific product you are buying is more reliable than any general guide.