Greek Yogurt: Nutrition Facts, Health Benefits, and the Complete Guide to the Straining Process

Greek yogurt has gone from a niche specialty item to one of the most popular dairy products in the world over the past two decades — and unlike many nutrition trends, this one is genuinely well-deserved. The defining feature of Greek yogurt is straining: after fermentation, much of the liquid whey is removed, leaving behind a thicker, more concentrated product with roughly double the protein of regular yogurt. At 10.3g of protein and just 61 calories per 100g for the non-fat version — with less than half the sugar of regular non-fat yogurt — it’s one of the most efficient whole-food protein sources in the dairy aisle.

Greek Yogurt Nutrition Facts (per 100g, plain, non-fat)

* Value from USDA’s SR Legacy data, where the Foundation Foods entry doesn’t include it.

Greek Yogurt Nutrition Facts (per 170g serving — a standard single-serve pot)

A standard individual pot of Greek yogurt is approximately 170g:

A single pot delivers 17.5g of protein for about 100 calories, along with half a day’s Vitamin B12 — a protein-to-calorie ratio that few whole foods can match.

Vitamins in Greek Yogurt (per 100g)

Standout: Greek yogurt’s B12 content (29% DV per 100g, rising to 50% per pot) is its strongest vitamin contribution — valuable for anyone relying on dairy as a B12 source, since this vitamin is essential for red blood cell formation, myelin synthesis, and neurological function, and is found almost exclusively in animal-derived foods. Riboflavin (22% DV) supports the FAD/FMN coenzymes central to cellular energy metabolism. Non-fat Greek yogurt contains almost no Vitamin A or Vitamin D unless fortified, since these fat-soluble vitamins are removed with the milk fat.

Minerals in Greek Yogurt (per 100g)

Standout: Selenium at 18% DV per 100g (31% per pot) supports glutathione peroxidase, one of the body’s main antioxidant enzyme systems, as well as thyroid hormone activation. Phosphorus at 11% DV per 100g (18% per pot) is also useful — phosphorus is the second most abundant mineral in the body, a structural component of bone alongside calcium, and part of ATP, the molecule every cell uses to store and transfer energy.

What Straining Actually Does: The Process Behind the Nutrition

Greek yogurt starts out the same way as regular yogurt — milk is fermented with live bacterial cultures (typically Lactobacillus bulgaricus and Streptococcus thermophilus) that convert lactose into lactic acid, thickening the milk and creating yogurt’s characteristic tang. The defining difference comes after fermentation: Greek yogurt is strained through a cloth or fine filter to remove much of the liquid whey, which carries away much of the lactose, some of the calcium, and a lot of water.

This straining process explains every major nutritional difference between Greek and regular yogurt:

More concentrated protein — removing whey concentrates the remaining solids, which are mostly casein protein. In USDA’s data, Greek yogurt has about 1.8–2.3 times the protein of regular yogurt with the same fat level.

Lower sugar — because much of the lactose leaves with the whey, plain Greek yogurt contains noticeably less natural sugar than regular yogurt — 3.3g per 100g for non-fat Greek against 7.7g for regular non-fat yogurt.

Thicker texture — the removed liquid is what gives regular yogurt its looser consistency; without it, Greek yogurt has its characteristically dense, spoonable texture.

Lower calcium per 100g — somewhat counterintuitively, because part of the calcium dissolves into the whey and is strained away, Greek yogurt contains less calcium than regular yogurt — 111mg per 100g for non-fat Greek against 199mg for regular non-fat yogurt — despite being more concentrated in most other respects.

Health Benefits of Greek Yogurt

Exceptional Protein Density

At 10.3g of protein per 100g and just 61 calories, non-fat Greek yogurt offers one of the best protein-to-calorie ratios of any widely available whole food. Its protein is mostly casein, the slow-digesting milk protein that releases amino acids gradually over several hours rather than in a rapid burst — useful for sustained fullness between meals or before a long gap without eating, such as overnight.

Strong B12 and Selenium Contribution

With 29% DV of B12 and 18% DV of selenium per 100g — 50% and 31% per pot — Greek yogurt is a meaningful, low-effort source of two nutrients that matter for neurological health and antioxidant defense, in a food many people already eat regularly.

Probiotic Content

Greek yogurt is made with live bacterial cultures, and straining doesn’t involve heat that would kill them, so most commercial Greek yogurt still contains live and active cultures when sold. It’s worth checking the label, though, since some products are heat-treated after culturing to extend shelf life, which kills the bacteria. These cultures may support gut microbiome health, and some strains have specific research behind them for digestive comfort and immune support.

Phosphorus for Bone and Energy Metabolism

Phosphorus (11% DV per 100g, 18% per pot) works alongside calcium as a structural component of bone, and is independently essential as part of ATP, the molecule that stores and releases energy in every cell — relevant to training capacity and recovery, not just bone health.

Satiety and Weight Management

High protein, minimal fat (in non-fat varieties), and a thick, dense texture make Greek yogurt very filling for its calories. Studies of high-protein yogurt snacks have found they reduce hunger and delay the next meal compared with lower-protein snacks with the same calories.

Generally Well-Tolerated Lactose Content

Because much of the lactose is removed during straining, and yogurt’s bacteria help digest some of what remains, many people with mild lactose intolerance find Greek yogurt easier to tolerate than milk or regular yogurt. It is not lactose-free, though, and people with more significant intolerance may still experience symptoms.

Greek Yogurt for Athletes and Active People

A Practical Pre-Sleep or Between-Meal Protein

The casein-rich, slow-digesting protein makes Greek yogurt a sensible whole-food choice before bed or during long stretches between meals, providing a steady amino acid supply rather than a quick spike followed by a gap.

High Protein-to-Calorie Ratio for Cutting Phases

At about 0.17g of protein per calorie, non-fat Greek yogurt sits among the most efficient whole-food protein sources available, making it particularly useful when calories are being deliberately managed during a fat loss phase but protein intake still needs to stay high.

Versatile Recovery Food

A pot of Greek yogurt with fruit and a little honey or granola combines faster carbohydrate with slower-digesting protein after training — simple, with no cooking required, which matters on busy training days.

Phosphorus and Selenium for Training Demands

Phosphorus supports the ATP-driven energy systems that power every muscle contraction, while selenium contributes to the antioxidant defenses that help manage the oxidative stress of intense training.

Greek Yogurt vs Regular Yogurt: The Direct Comparison

Compared like for like, Greek yogurt has about 1.8 times the protein of regular yogurt in the non-fat versions and 2.3 times in the whole-milk versions, for a few more calories. That protein difference is the main reason Greek yogurt has become the default choice for anyone prioritizing protein from dairy. The trade-off is calcium: regular non-fat yogurt provides nearly twice as much per 100g, so if calcium is your priority, regular yogurt has the edge.

Full-Fat vs Non-Fat Greek Yogurt

Non-fat (0%) — the data on this page: 61 calories and 10.3g of protein per 100g. The leanest option, most practical for strict calorie management.

Low-fat (around 2%) — a middle ground with a slightly creamier texture: about 73 calories, 10g of protein, and 1.9g of fat per 100g in USDA’s data.

Full-fat (whole milk) — noticeably richer and creamier: 95 calories, 8.8g of protein, and 4.4g of fat (2.4g saturated) per 100g in USDA’s data. Some brands go higher still, at up to around 10% fat, with correspondingly more calories.

There’s no single correct choice between these — it depends on calorie goals, taste preference, and how the rest of the day’s fat intake is structured.

Practical Ways to Include Greek Yogurt in Your Diet

With fruit and a drizzle of honey — a simple, balanced combination of protein, natural sugar, and fiber from the fruit that takes seconds to prepare.

As a base for a high-protein smoothie — blends well with fruit, milk, and a scoop of protein powder for an even more concentrated protein hit.

As a savory substitute for sour cream or mayonnaise — works well in dips and dressings and as a topping for baked potatoes or curries, adding protein where a typical condiment would add very little.

Mixed with oats overnight — combining Greek yogurt with oats, milk, and fruit creates a thick, protein-rich overnight breakfast that requires no cooking.

As a marinade base — the mild acidity and thick texture make Greek yogurt an effective tenderizing marinade base for chicken or lamb, common in many traditional cuisines.

Potential Considerations

Flavored varieties carry a very different sugar profile — plain and flavored Greek yogurt are nutritionally distinct products. In USDA’s data, non-fat strawberry Greek yogurt has 11.5g of sugar per 100g, against 3.3g for plain — similar in principle to the sugar load in standard flavored yogurt — so checking the label remains important even within the “Greek yogurt” category.

Lower calcium than regular yogurt — as covered above, straining removes some calcium; anyone relying on yogurt as a main calcium source should factor this in.

Lactose intolerance — while generally better tolerated than milk or regular yogurt, Greek yogurt is not lactose-free, and people with more significant intolerance may still experience symptoms.

Dairy allergy — distinct from lactose intolerance; people with a diagnosed milk protein allergy must avoid Greek yogurt entirely regardless of its lactose content.

Sodium in some commercial products — plain Greek yogurt is low in sodium (36mg per 100g), but it’s worth checking labels on flavored or specialty products, where sodium can be higher.

Nutrient data: USDA FoodData Central, Foundation Foods (FDC ID 330137); values marked * from SR Legacy (FDC ID 170894). Comparisons: plain whole-milk Greek yogurt (FDC ID 2259794), plain whole-milk yogurt (FDC ID 2259793), and non-fat strawberry Greek yogurt (FDC ID 330415) from Foundation Foods; plain non-fat yogurt (FDC ID 170887) and low-fat Greek yogurt (FDC ID 170903) from SR Legacy. % Daily Values use the FDA’s current Daily Values.