Greek yogurt with hemp seeds and almonds beside boiled eggs

Greek Yogurt Protein: What You Need to Know

ByCraig Brockie Last updated

How much protein is in Greek yogurt?

Greek yogurt protein runs about 9 to 10 grams per 100 g of plain yogurt, or 15 to 17 grams in a 6-ounce (170 g) serving, according to USDA data. That is nearly twice the protein of regular plain yogurt, because straining drains off liquid whey while most of the milk protein stays in the curd.

Here are USDA values for plain yogurt, scaled to 170 g, the reference amount FDA uses for yogurt:

Plain yogurtProtein per 100 gProtein per 170 gCalories per 170 g
Greek, nonfat10.2 g17.3 g100
Greek, low-fat9.95 g16.9 g124
Greek, whole milk9.0 g15.3 g165
Regular, nonfat5.73 g9.7 g95
Regular, low-fat5.25 g8.9 g107
Regular, whole milk3.47 g5.9 g104

Fat level changes protein only slightly, but it changes calories. Brands also vary: FDA notes that makers may add milk-derived ingredients to reach a desired protein content in Greek-style yogurt.

Why straining concentrates protein

About 79% of milk protein is casein (University of Guelph), which barely dissolves at pH 4.6. Yogurt must reach that pH or lower (21 CFR 131.200), so casein forms the gel that stays in the strainer, and whey proteins denatured by heating the milk coagulate with it (University of Wisconsin–Madison). The acid whey that drains off held only 0.4 to 0.7% protein in one analysis, against about 3.5% lactose (Karastamatis et al., 2022).

Straining mostly removes water, milk sugar and minerals, including calcium: USDA lists 110 mg per 100 g in nonfat Greek against 199 mg in regular nonfat. By our arithmetic, straining whole-milk yogurt to half its weight gives about 6 g of protein per 100 g; matching USDA’s 9 g means straining to about a third. Factories may also add milk or whey protein concentrates (UW–Madison); see How Is Greek Yogurt Made? Explained.

Greek yogurt vs. skyr, cottage cheese and milk

Food (USDA)Protein per 100 gServingProtein per servingCalories per serving
Greek yogurt, plain nonfat10.2 g6 oz (170 g)17.3 g100
Cottage cheese, 2%10.4 g½ cup (113 g)11.8 g92
Milk, nonfat3.37 g1 cup (245 g)8.3 g83
Milk, whole3.15 g1 cup (244 g)7.7 g149

Gram for gram, low-fat cottage cheese matches nonfat Greek yogurt, but it has far more sodium: 308 mg per 100 g against 36 mg. Milk has about a third of the protein by weight. Skyr, an Icelandic-style strained cultured dairy food, is made in a similar way but has no USDA entry, so check its label for protein.

Protein quality in plain terms

Quality means supplying the nine amino acids your body can’t make, in a form you digest well. The Dietary Reference Intakes list milk, cheese and yogurt among foods whose proteins provide all nine in adequate amounts, so they are called complete proteins. In 2013 an FAO expert group recommended a newer score, DIAAS, which measures amino acid digestion at the end of the small intestine (Moughan and Lim, 2024). In a 2017 study in pigs, dairy protein ingredients scored 123 to 141, above the “excellent” cutoff of 100, while pea protein concentrate scored 73 and wheat 54. A dairy industry program funded it, and it tested milk powders, not yogurt.

Why Greek yogurt protein matters, including for your gut

How much protein adults need

The Recommended Dietary Allowance is 0.8 g per kilogram of body weight a day: 46 g for women, 56 g for men and 71 g in pregnancy or breastfeeding, set to cover 97 to 98% of people (National Academies). The Dietary Guidelines for Americans, 2025–2030 set a higher goal of 1.2 to 1.6 g/kg and advise protein foods at every meal. For a 154-pound (70 kg) adult, a 170 g serving of nonfat Greek yogurt covers about 31% of the RDA, or 15 to 21% of the new target.

Fullness and muscle

The evidence is small trials. In 15 women, a 160-calorie Greek yogurt snack with 24 g of protein reduced hunger and delayed dinner by about 26 minutes versus a low-protein yogurt (Douglas et al., 2013), but a trial in 32 women found no difference between 14 g and 5 g (Ortinau et al., 2013). In 30 untrained young men, Greek yogurt during 12 weeks of training led to greater strength and lean-mass gains than a carbohydrate pudding (Bridge et al., 2019).

Where the gut comes in

Most protein is digested in the small intestine. What escapes, more likely at very high intakes, is fermented by colon bacteria into compounds such as ammonia and hydrogen sulfide, some linked to harm in mostly animal and lab studies; fermentable fiber appears to steer bacteria away from protein fermentation (Diether and Willing, 2019). Human evidence is thin, but it is a reason to eat Greek yogurt with fiber-rich foods.

Greek yogurt also has less milk sugar: 3.24 g of total sugars per 100 g in nonfat Greek against 7.68 g in regular nonfat, and some people with lactose intolerance find yogurt easier to tolerate (NIDDK). If it carries live cultures, those alone don’t make it a proven probiotic (ISAPP, 2021).

How to get the most protein from Greek yogurt

Greek yogurt bowl with pumpkin seeds, almonds and nut butter

Reading the label

  • Weight, not cups: compare protein per gram, since container sizes vary.
  • Claims: “high protein” means at least 20% of the Daily Value per 170 g serving, “good source” 10 to 19% (21 CFR 101.54). The Daily Value is 50 g, and a label with a protein claim must show a %DV adjusted for protein quality (21 CFR 101.9).
  • Ingredients: milk or whey protein concentrate means protein was added, not only concentrated by straining.
  • Added sugars: the 2025–2030 guidelines cap yogurt snacks at 2.5 g per ⅔ cup; plain has none.

Making it thicker at home

Straining plain yogurt yourself raises its protein per spoonful. Strain it covered in the refrigerator at 40°F (4°C) or below (FoodSafety.gov), never on the counter, where perishable food shouldn’t sit more than 2 hours (USDA FSIS). Ultimate Health Solutions, the company that publishes this site, recommends checking every hour and expecting roughly half the starting volume. Full steps are in How to Make Greek Yogurt: A Step-by-Step Guide.

The drained whey holds little protein; the same guide suggests using it like buttermilk in baking, marinades, dressings or smoothies.

Everyday ways to use it

Dairy Greek yogurt is not an option with a milk allergy (FDA). People with chronic kidney disease may need moderate protein and should set the amount with a dietitian or clinician (NIDDK).

More on Greek yogurt

Sources

Craig Brockie is the founder of Ultimate Health Solutions, the company behind Ultimate Gut, and the author of Ultimate Health, The Ultimate Gut Health Guide and The Unlimited Probiotics Guide. After injuries and chronic health problems in his twenties that conventional care didn’t resolve, he began researching health on his own and has studied natural health for 30 years. He is not a medical professional, and his articles are general information, not medical advice.

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