Plain nonfat Greek yogurt packs 10.2g of protein per 100g; regular plain nonfat yogurt has 5.7g — Greek delivers roughly 2.5x the protein density. But there’s a catch: a 100g serving of regular yogurt provides 199mg of calcium, while Greek offers only 110mg — that counterintuitive 80% deficit matters if you’re relying on yogurt for your daily calcium intake.
The difference comes down to processing. Greek yogurt is strained to remove whey, concentrating protein and milk solids while stripping out calcium and lactose. Regular yogurt skips that step, keeping more of the liquid nutrients and milk sugar. Neither is objectively “better” — the answer depends on your nutritional priority.
This guide pulls every number from USDA FoodData Central and explains what each difference means for your diet.
Side-by-Side Nutrition (per 100g, plain nonfat)
| Nutrient | Greek Yogurt | Regular Yogurt | Difference |
|---|---|---|---|
| Calories | 59 kcal | 56 kcal | Greek +3 kcal |
| Protein | 10.2 g | 5.7 g | Greek +79% |
| Total Fat | 0.4 g | 0.2 g | Greek +100% |
| Carbohydrates | 3.6 g | 7.7 g | Regular +114% |
| — Lactose (intrinsic) | ~2–2.5 g | ~4–4.5 g | Regular +80% |
| Calcium | 110 mg | 199 mg | Regular +81% |
| Sodium | 46 mg | 75 mg | Regular +63% |
| Potassium | 141 mg | 155 mg | Regular +10% |
| Vitamin B12 | 0.4 µg | 0.3 µg | Greek +33% |
Data: USDA FoodData Central, plain nonfat yogurts (Greek yogurt ID 171288; regular yogurt ID 171274). Live cultures vary by brand but both contain beneficial probiotics when unpasteurized post-fermentation.
Why Greek Yogurt Has So Much More Protein
Greek yogurt is made by straining regular yogurt through cheesecloth or specialized ultrafiltration membranes. This process removes the liquid whey component, leaving behind the milk solids — which are protein-rich.
A 150g serving of Greek yogurt (a typical yogurt cup) delivers about 15g of protein — equivalent to 2 whole eggs or 50g of cooked chicken breast. That same serving of regular yogurt provides only 8–9g. For people targeting 120–150g of daily protein, Greek yogurt becomes a meaningful contributor; regular yogurt is more of a side dish.
The straining process is why Greek yogurt costs more and has a thicker, creamier texture — you’re paying for the labor of concentrating 2 liters of regular yogurt down to 1 liter of Greek yogurt.
The Calcium Paradox: Why Regular Yogurt Wins
This surprises most people: regular yogurt has 80% more calcium per 100g than Greek yogurt (199mg vs 110mg).
Here’s why: when whey is drained away, a significant portion of the calcium goes with it. Calcium is more soluble in liquid than protein, so the filtering process preferentially removes it. One 150g serving of Greek yogurt gives you 165mg calcium (13% of daily value); the same serving of regular yogurt provides 299mg calcium (23% of daily value).
If your primary goal is maximizing calcium intake from yogurt, regular is the smarter choice per gram. However, both yogurts deliver far less calcium than a glass of milk (300mg in 240ml) or a serving of fortified plant-based milk. For real calcium intake, you’ll need to combine yogurt with other sources — cheese, leafy greens, fortified beverages, or supplements.
Lactose Content: A Real Difference for Sensitive Stomachs
Greek and regular yogurt both start as milk, which contains lactose (milk sugar). But fermentation converts some of it to lactic acid, and straining removes more:
- Regular yogurt: ~4–4.5g lactose per 100g (most of the original milk lactose remains)
- Greek yogurt: ~2–2.5g lactose per 100g (the straining step removes extra liquid, further reducing lactose)
For people with lactose intolerance or IBS-D triggered by lactose, Greek yogurt is the gentler choice. A 150g serving of Greek yogurt contains roughly 3–4g of lactose (similar to one slice of cheese); regular yogurt delivers 6–7g (closer to a glass of milk).
That said, both are dramatically lower in lactose than milk. Many people with mild lactose sensitivity can handle yogurt — especially Greek — without the bloating or digestive upset that milk causes. The live cultures also help: they continue fermenting lactose even after packaging, especially if stored cold.
Sugar Content: Plain vs Flavored Is the Real Story
When comparing plain yogurts, the sugar difference is minimal:
- Plain nonfat Greek yogurt: 3.6g carbs per 100g (almost entirely lactose, ~0.1g added sugar)
- Plain nonfat regular yogurt: 7.7g carbs per 100g (mostly lactose, ~0.1g added sugar)
The carbohydrate difference is mostly lactose, not added sugar. Plain is plain — either yogurt is a low-sugar food.
But flavored yogurts are a different story. A single 150g serving of strawberry or vanilla yogurt (Greek or regular) often contains 10–20g of added sugar — more than a soda. Fruit-on-the-bottom yogurts are even worse, packing 25g+ of sugar per serving. This is where your choice of yogurt matters far less than your choice of flavor level.
Best practice: buy plain yogurt and add your own fruit, honey, or granola. You control the sugar; a 150g serving of plain yogurt plus 50g of fresh berries (6g sugar) is still under 10g total sugar, well below any commercial flavored option.
Probiotics and Processing
Both Greek and regular yogurt contain live probiotic cultures — typically Lactobacillus bulgaricus and Streptococcus thermophilus, plus optional additional strains like Lactobacillus acidophilus. The list appears on the label under “live and active cultures.”
Straining does not kill probiotics. However:
- Stability: Greek yogurt’s lower water content can extend shelf life, potentially preserving cultures longer
- Variety: some Greek yogurt brands use fewer probiotic strains than premium regular yogurts
- Processing heat: some brands heat-treat yogurt after fermentation (which kills all cultures) — check the label for “live and active cultures” seal
If probiotics are your goal, choose any plain yogurt with an active cultures label, whether Greek or regular. The probiotic content varies far more by brand and storage than by style.
Which One Should You Pick?
Choose Greek yogurt if:
- You’re targeting high protein intake (muscle building, satiety, athletic recovery)
- You have lactose sensitivity or IBS-D
- You prefer a thicker, creamier texture
- You’re okay with lower calcium intake and can get it elsewhere
Choose regular yogurt if:
- You want maximum calcium per serving (especially if dairy is your primary calcium source)
- You’re on a tight budget — regular yogurt is cheaper per ounce
- You use yogurt as an ingredient in cooking (sauces, marinades, baking) and prefer the looser consistency
- You want a broader range of probiotic strains (some premium regular yogurts offer more varieties)
For weight loss: Greek yogurt has a slight edge — its 10g protein per 100g versus 5.7g means more satiety per calorie. A 150g serving (90 calories, 15g protein) keeps you fuller longer than 150g of regular (84 calories, 8.5g protein). But the difference is modest; both beat flavored yogurt by a mile.
The Bottom Line
Plain nonfat Greek yogurt: 59 kcal, 10.2g protein, 3.6g carbs (lactose), 110mg calcium per 100g. Best for high-protein goals and lactose sensitivity.
Plain nonfat regular yogurt: 56 kcal, 5.7g protein, 7.7g carbs (lactose), 199mg calcium per 100g. Best for maximum calcium and budget-conscious cooking.
Neither is healthier in absolute terms — they’re optimized for different nutritional priorities. The real health lever is choosing plain over flavored, regardless of style. A 150g serving of plain yogurt (Greek or regular) with fresh berries is a 100–120 calorie, 8–15g protein, low-sugar snack that fits virtually any diet. Flavored yogurt, by contrast, is a dessert masquerading as health food.
Frequently asked questions
How much more protein does Greek yogurt have?
Plain nonfat Greek yogurt contains about 10.2g of protein per 100g, compared to 5.7g per 100g in plain nonfat regular yogurt — roughly 1.8x more protein per serving. A 150g serving of Greek yogurt provides ~15g protein (30% of daily value), while regular yogurt provides ~8.5g. Greek's higher protein comes from the straining process, which concentrates milk solids and removes liquid whey.
Does Greek yogurt have less calcium than regular yogurt?
Yes. Plain nonfat Greek yogurt has about 110mg calcium per 100g, while plain nonfat regular yogurt has 199mg per 100g — roughly 80% more. This happens because straining removes whey (which contains calcium), concentrating protein instead. If maximum calcium intake is your goal, regular yogurt is the better choice per 100g.
Which yogurt is better for lactose intolerance?
Greek yogurt is generally better-tolerated. Because it's strained, the liquid whey (which carries much of the lactose) is removed. Greek yogurt typically contains 1–2g lactose per 100g versus 3–4g in regular yogurt. However, all yogurt (Greek and regular) has less lactose than milk because live cultures ferment some of it into lactic acid.
Does Greek yogurt have less sugar than regular?
In plain, unsweetened forms, both have similar intrinsic sugar (lactose). Plain nonfat Greek yogurt has ~3.6g carbs per 100g (nearly all lactose); plain regular has ~7.7g carbs (more lactose). But flavored yogurts add 10–20g of added sugar per serving — whether Greek or regular. Always check the label; plain is the only reliable low-sugar choice.
Which yogurt is better for weight loss?
Greek yogurt edges out regular for satiety: it has 2–3x more protein per serving, and protein increases fullness longer than carbs. However, regular yogurt is only slightly lower in calories (56 kcal/100g vs 59 kcal/100g). The real lever is portion control and avoiding flavored yogurts, which add 100+ calories per serving in sugar.