Regular mozzarella is not technically a low-fat cheese. A one-ounce serving of whole milk mozzarella contains about 6 grams of fat, which is double the 3-gram limit the FDA sets for foods labeled “low fat.” That said, mozzarella is one of the leaner options in the cheese aisle, with significantly less fat than most popular varieties.
What “Low Fat” Actually Means on a Label
The FDA has a strict definition: a food can only be labeled “low fat” if it contains 3 grams of fat or less per serving. Regular mozzarella, at 6 grams per ounce, doesn’t qualify. However, part-skim mozzarella comes closer, and some brands sell versions specifically marketed as “low-fat mozzarella” that meet the threshold by reducing the milk fat content during production.
This distinction matters if you’re tracking fat intake closely. If you’re simply looking for a cheese that’s lighter than most, regular mozzarella already fits that role without needing the reduced-fat version.
How Mozzarella Compares to Other Cheeses
At 6 grams of fat per ounce, mozzarella contains about a third less fat than cheddar (9 grams) and noticeably less than brie (8 grams). That gap adds up quickly. Topping a pizza or sandwich with mozzarella instead of cheddar saves you 3 grams of fat per ounce, and most people use more than a single ounce at a time.
The protein content is another reason mozzarella stands out. It delivers roughly equal amounts of protein and fat by weight, around 25 grams of each per cup shredded. Many harder, fattier cheeses tilt that ratio heavily toward fat. Mozzarella also packs about 630 milligrams of calcium per 100 grams, making it one of the more nutrient-dense cheese choices.
Fresh vs. Low-Moisture Mozzarella
The soft, wet balls of mozzarella you find packed in liquid are fresh mozzarella. The shredded or block form you’d use on pizza is low-moisture mozzarella. Both types are required by USDA standards to contain at least 45% milk fat on a dry basis, so the fat percentage of the actual cheese solids is the same.
The real difference is water content. Fresh mozzarella contains 52% to 60% moisture, while the low-moisture version contains 45% to 52%. Because fresh mozzarella has more water per bite, you’re getting slightly less fat (and less of everything else) per ounce compared to the denser block form. If you’re trying to keep fat intake low, fresh mozzarella is the lighter option ounce for ounce, though the difference is modest.
Where Mozzarella Fits in Your Diet
The Dietary Guidelines for Americans recommend keeping saturated fat below 10% of daily calories. On a 2,000-calorie diet, that works out to roughly 20 grams per day. A single ounce of whole milk mozzarella contributes about 3.5 to 4 grams of saturated fat, so it fits comfortably into that budget as long as you’re not piling it on throughout the day.
For people on keto or low-carb diets, mozzarella is a strong fit for different reasons. It has essentially zero carbs per serving, and its moderate fat content pairs well with other high-fat foods without pushing a single meal’s fat count too high. It’s one of the more versatile cheeses for macro tracking because it doesn’t dominate any one category.
Some research suggests that moderate cheese intake, particularly fresh varieties like mozzarella, may be associated with a lower risk of overweight and metabolic issues like type 2 diabetes. The protein in cheese is primarily casein, which breaks down into smaller molecules during fermentation and is absorbed efficiently. That combination of protein and fat also tends to be more satisfying per calorie than snacks that are purely carbohydrate-based.
Choosing the Leanest Mozzarella
If you want mozzarella that truly qualifies as low fat by FDA standards, look for packages specifically labeled “low-fat” or “fat-free” mozzarella. Part-skim mozzarella is a middle ground, typically landing around 4.5 to 5 grams of fat per ounce. It melts and tastes closer to the regular version than fat-free options, which can turn rubbery when heated.
For cooking, part-skim low-moisture mozzarella is the most practical swap. It still browns and stretches on pizza, holds up in baked dishes, and shaves a gram or two of fat per serving compared to the whole milk version. Fresh mozzarella works best in salads and cold dishes where its higher moisture content is an asset rather than a problem.