Most natural cheeses contain less than 1 gram of sugar per serving, and many hard, aged varieties have so little that the nutrition label rounds down to zero. The sugar in cheese is lactose, a natural milk sugar, and the cheesemaking process removes most of it. But the amount varies widely depending on whether a cheese is fresh, aged, or processed.
Why Most Cheese Is So Low in Sugar
Milk contains about 12 grams of lactose per cup, so you might expect cheese to be loaded with sugar. It isn’t, because of two things that happen during production. First, when milk is separated into curds and whey, most of the lactose drains off with the liquid whey. Second, the bacterial cultures added during cheesemaking consume the remaining lactose and convert it into lactic acid. That’s what gives cheese its tangy flavor and also why the sugar content drops dramatically.
The longer a cheese ages, the more time bacteria have to consume whatever lactose remains. A cheddar aged for a year or more has had nearly all its lactose converted. A fresh cheese like ricotta, which skips the long aging step, retains considerably more.
Sugar Content by Cheese Type
The differences across cheese types are significant enough to matter if you’re watching sugar intake or managing lactose intolerance. Here’s what the numbers look like per standard serving:
- Sharp cheddar (1 oz): 0.4 to 0.6 grams of lactose. Monash University’s FODMAP research puts it even lower at around 0.04 grams per two-slice (40g) serving.
- Mozzarella, part-skim (1 oz): 0.08 to 0.9 grams, depending on moisture content and aging.
- Cream cheese (1 oz): 0.1 to 0.8 grams.
- Cottage cheese (½ cup): 0.7 to 4 grams. The wide range reflects differences in how it’s made and whether whey is washed off.
- Ricotta (½ cup): 0.3 to 6 grams. This is one of the highest-sugar natural cheeses because it’s made from whey, where much of milk’s lactose ends up.
- American processed cheese (1 oz): 0.5 to 4 grams.
Hard, long-aged cheeses like Parmesan, aged Gouda, and Swiss tend to fall at the very bottom of the range, often containing trace amounts too small to measure meaningfully. Fresh, soft cheeses sit at the top.
Why the Label Often Says “0g Sugar”
If you’ve checked the nutrition facts on a block of cheddar and seen “0g” next to sugars, the cheese isn’t necessarily sugar-free. Under FDA labeling rules, any food with less than 0.5 grams of sugar per serving can list the amount as zero. Since most aged cheeses fall well below that threshold, they qualify. The label is technically accurate, but it obscures the trace amounts that are still present. For most people, this distinction is irrelevant. For someone extremely sensitive to lactose, it’s worth knowing.
Processed Cheese Can Contain Added Sugars
Natural cheese gets its sugar only from lactose. Processed cheese is a different story. Federal regulations for products like pasteurized process cheese spreads explicitly allow sweetening agents including sugar, dextrose, corn syrup, corn syrup solids, maltose, and malt syrup. These are added for flavor and texture, and they push the sugar content higher than what you’d find in a natural cheese.
Processed cheese slices, cheese dips, spray cheese, and flavored cream cheese spreads are the most common culprits. Some flavored varieties (like a fruit-topped cream cheese or a port wine cheese spread) can contain 3 to 5 grams of sugar per serving, which is comparable to some sweetened yogurts. Checking the ingredients list for corn syrup, sugar, or dextrose is the easiest way to spot added sugars in these products.
Cheese and Blood Sugar
Because most natural cheese is very low in sugar and high in fat and protein, it has a low glycemic index, meaning it causes minimal blood sugar spikes. Diabetes Canada classifies natural cheeses like cheddar and cottage cheese as low glycemic index foods (55 or below). Processed cheeses rank in the medium range (56 to 69), partly because of added sugars and fillers, and are recommended only occasionally for people managing blood sugar.
For people with diabetes or insulin resistance, natural cheese is generally one of the more blood-sugar-friendly foods available. The combination of fat, protein, and near-zero sugar means it digests slowly and produces a very gradual glucose response.
What This Means for Lactose Intolerance
Lactose is the only sugar naturally present in cheese, so sugar content and lactose content are essentially the same number. Research from the NIDDK suggests that many lactose-intolerant people can handle up to 12 grams of lactose in a single sitting (roughly one cup of milk) without symptoms or with only mild discomfort. Most natural cheeses fall far below that threshold. A one-ounce serving of aged cheddar delivers less than a single gram.
If you’re lactose intolerant and want to play it safe, stick with hard, aged cheeses. Parmesan, aged cheddar, Gruyère, and aged Gouda are all reliably low. Cottage cheese and ricotta are the ones most likely to cause trouble, since they can contain several grams of lactose per half-cup serving. Even then, they’re still well below the amount in a glass of milk.