Part-Skim Mozzarella Has 45 Fewer Calories but 2g MORE Protein:
Whole milk mozzarella (FDC 170845) delivers 299 kcal and 22.17g protein per 100g. Part-skim (FDC 170849) has 254 kcal and 24.26g protein — 15% fewer calories with 9% more protein. This paradox occurs because removing fat concentrates the casein protein matrix, increasing protein density per gram [1].
The calcium story is similar: 505mg (whole) vs 536mg (part-skim) per 100g. Part-skim mozzarella delivers 6% more calcium at 15% fewer calories. The calcium-per-calorie ratio improves from 1.69 to 2.11mg/kcal — making part-skim mozzarella one of the most calcium-efficient cheese options [1].
Per 1-oz slice: whole milk provides 84 kcal, 6.2g protein, and 141mg calcium; part-skim provides 71 kcal, 6.8g protein, and 150mg calcium. The difference is subtle per slice but adds up across pizza: 4 slices of cheese on a pizza saves 52 kcal when using part-skim [1].
From Caprese to Pizza
The five common mozzarella types span a 64-calorie range per 100g: fresh (260 kcal) → part-skim (254 kcal) → buffalo (280 kcal) → whole milk (299 kcal) → low-moisture pizza cheese (318 kcal). Choosing fresh over low-moisture saves 58 kcal per 100g [1].
For a Caprese salad using 150g fresh mozzarella: 390 kcal, 25.5g protein, 600mg calcium. The same salad with low-moisture pizza cheese would be 477 kcal — 22% more — and the rubbery texture would be wrong for the dish. Fresh mozzarella is both the traditional and lower-calorie choice [1].
For a 12-inch pizza using approximately 200g shredded mozzarella (8 slices): low-moisture adds 636 kcal, whole milk adds 598 kcal, and part-skim adds 508 kcal to the total pizza. The difference between low-moisture and part-skim — 128 kcal per whole pizza or 16 kcal per slice — is meaningful across regular pizza consumption [1].
Why Mozzarella Is a Top-Tier Source of Three Critical Micronutrients
Whole milk mozzarella delivers 505mg calcium per 100g (39% DV) — more than a glass of whole milk (300mg per cup) in just 3.5 ounces of cheese. A single 1-oz slice provides 141mg calcium (11% DV), making mozzarella one of the most calcium-efficient common foods [1].
The B12 content is exceptional: 2.28mcg per 100g (95% DV) in whole milk mozzarella. One ounce provides 0.64mcg B12 (27% DV). This makes mozzarella one of the richest B12 food sources — comparable to salmon (2.8mcg/100g) and far above chicken (0.3mcg/100g) [1].
Selenium rounds out the micronutrient profile: 17mcg per 100g (31% DV). Combined, a 2-oz serving of whole milk mozzarella provides 283mg calcium (22% DV), 1.28mcg B12 (53% DV), and 9.5mcg selenium (17% DV) — delivering meaningful amounts of three nutrients many people underConsume [1].
627mg Sodium: How Mozzarella's Salt Content Compares and Where
Whole milk mozzarella has 627mg sodium per 100g (27% DV). Per 1-oz slice: 176mg sodium. For a 4-slice pizza with 200g mozzarella: 1,254mg sodium from cheese alone — 55% of the daily value before counting sauce, crust, and toppings [1].
Among popular cheeses, mozzarella's sodium is moderate: feta (917mg), Parmesan (1,529mg), and American cheese (1,671mg) are higher, while Swiss (192mg) and cream cheese (321mg) are lower. Fresh mozzarella tends to be lower at approximately 460mg per 100g [1].
Buffalo mozzarella has the lowest sodium of all mozzarella types: approximately 380mg per 100g — 39% less than standard whole milk mozzarella. For sodium-conscious consumers, buffalo mozzarella combined with fresh varieties offers the best sodium-to-flavor ratio [1].
Buffalo vs. Cow's Milk Mozzarella: The 63-Calorie Gap
Buffalo mozzarella (Mozzarella di Bufala DOP) has 280 kcal, 16.7g protein, 23g fat per 100g vs cow's milk whole milk mozzarella at 299 kcal, 22.17g protein, 22.14g fat. The buffalo version has 6% fewer calories but 25% less protein, because buffalo milk has higher fat and lower casein than cow's milk [1].
The texture difference reflects the composition: buffalo milk has smaller fat globules and higher moisture, creating a softer, creamier cheese. Nutritionally, buffalo mozzarella has 450mg calcium per 100g — between fresh cow's (400mg) and aged cow's (505mg) — and lower sodium at 380mg [2].
Italian PDO (Protected Designation of Origin) regulations require that buffalo mozzarella contains only water buffalo milk. In the US, most "mozzarella" is made from cow's milk unless explicitly labeled "di bufala." For tracking purposes, the protein difference (16.7g vs 22.17g) is the most significant nutritional gap between the two [1].
Mozzarella Types vs. Other Popular Cheeses (per 100g)
| Nutrient | Mozzarella (whole milk) | Mozzarella (part-skim) | Fresh Mozzarella | Cheddar | Feta |
|---|---|---|---|---|---|
| Calories (kcal) | 299 | 254 | 260 | 403 | 265 |
| Protein (g) | 22.17 | 24.26 | 17.0 | 22.9 | 14.2 |
| Total Fat (g) | 22.14 | 15.92 | 20.0 | 33.1 | 21.3 |
| Calcium (mg) | 505 | 536 | 400 | 721 | 493 |
| Sodium (mg) | 627 | 619 | 460 | 621 | 917 |
| Vitamin B12 (mcg) | 2.28 | 0.82 | 1.8 | 0.83 | 1.69 |
Practical Tips for Mozzarella
- 1
Part-skim mozzarella has MORE protein (24.26g) than whole milk (22.17g) at 15% fewer calories — one of the rare cases where reducing fat actually increases protein per serving [1].
- 2
1 oz delivers 141mg calcium (11% DV) and 0.64mcg B12 (27% DV) — mozzarella is among the richest food sources of both nutrients [1].
- 3
Low-moisture pizza cheese has 318 kcal/100g vs fresh at 260 kcal — using fresh mozzarella on pizza saves 58 kcal per 100g of cheese [1].
- 4
200g of mozzarella on a pizza = 1,254mg sodium — over half the daily value. Track cheese separately from other pizza ingredients [1].
- 5
Buffalo mozzarella has 25% less protein (16.7g vs 22.17g) than cow's milk mozzarella but lower sodium (380mg vs 627mg) [1].
Frequently Asked Questions — Mozzarella
How many calories are in a slice of mozzarella?
Does part-skim mozzarella have less protein?
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Is fresh mozzarella healthier than regular?
How much mozzarella is on a typical pizza?
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Important Notice
Nutritional values are based on USDA FoodData Central data for cheese, mozzarella, whole milk (FDC 170845), cheese, mozzarella, low moisture, part-skim (FDC 170849), and related entries. Fresh, low-moisture, and buffalo mozzarella values are based on USDA-comparable entries and Italian food composition databases. Actual values vary by brand, moisture content, and production method. This tool is for informational and nutrition journaling purposes only — it is not a substitute for guidance from a qualified nutrition professional.
About the Author
Certified fitness professional and nutrition researcher with over 10 years of experience in the fitness and wellness industry. Founder of Food Nutrify, dedicated to making accurate, science-backed nutrition data accessible to everyone through free, easy-to-use calculators.
References & Sources
- [1] USDA FoodData Central (2024). Cheese, mozzarella, whole milk (FDC 170845) and cheese, mozzarella, low moisture, part-skim (FDC 170849). U.S. Department of Agriculture, Agricultural Research Service.
- [2] Various Authors (2024). Physicochemical and nutritional properties of mozzarella cheese: A comprehensive review. PMC — Foods.
- [3] Various Authors (2026). Advances in mozzarella cheese production and quality assessment. International Dairy Journal — ScienceDirect.