Greek Yogurt

What Is Greek Yogurt?

Greek yogurt is yogurt that has been strained to remove the whey. Straining gives it a thicker texture than regular yogurt. Some of the calcium leaves with the liquid, so not every component becomes more concentrated to the same degree. An explanation of strained yogurt from the Harvard Nutrition Source.

In Hebrew it is called “יוגורט יווני”.

What is the difference between Greek yogurt and regular yogurt?

The main difference is the straining: Greek yogurt is thicker and usually contains more protein per 100 grams. The amount of sugar, calcium and calories also depends on the fat percentage and the product’s recipe. The word “Greek” on its own does not guarantee fewer calories or more calcium.

Greek yogurt vs. regular yogurt: nutrition per 100 grams

These are rounded examples from the USDA entries for low-fat Greek yogurt and whole-milk regular yogurt, not uniform values for every brand. The fat percentages also differ, so the comparison does not measure the effect of straining alone. Flavored Greek yogurt may contain added sugar; compare product labels at the same weight.

100 grams of the Greek yogurt in the table also provide about 2 grams of fat and 4 grams of carbohydrate. A 200-gram pot provides about 20 grams of protein and about 146 calories, before toppings.

What straining does — for better and for worse

Straining is the whole story, and it pushes in two opposite directions:

What goes up:

• Protein — about 10 grams per 100 grams in the example in the table, compared with about 3.5 grams in the regular yogurt. The gap varies between products.
• Thickness and texture — which is what makes it a good substitute for sour cream and mayonnaise.

What goes down:

• Lactose — some of it leaves with the liquid, but Greek yogurt is not necessarily lactose-free.
• Calcium — some of it leaves with the whey. The gap between products is not constant, and some products are fortified with calcium; check the label.

One more distinction worth knowing: some products sold as “Greek-style yogurt” are not strained at all, but thickened with milk protein concentrate, starch or stabilizers. They are cheaper to make but do not have the same nutritional profile. The giveaway: a long ingredient list that includes thickeners.

Live cultures — what it means in practice

All yogurt is made from pasteurized milk to which bacterial cultures are added (mainly Lactobacillus bulgaricus and Streptococcus thermophilus) that carry out the fermentation. This point is often confused: pasteurization comes before fermentation and does not contradict it.

The meaningful question is whether the product was heat-treated after fermentation — a step that extends shelf life but kills the cultures. A product that was not usually carries a “contains live and active cultures” label.

An important caveat: the classic yogurt bacteria are not necessarily “probiotic” in the strict sense — that is, they do not necessarily survive the passage through the stomach and settle in the gut. Strains that have been shown to be probiotic (for example L. acidophilus, Bifidobacterium) are added specially and named on the package. The best-established effect of yogurt on digestion is actually help with breaking down lactose, where the evidence is good.

For another fermented dairy product, see Kefir.

Health benefits

• Dense protein: 10 grams per 100 grams at only 73 calories. A 200-gram pot provides about 20 grams of protein — one of the best protein-to-calorie ratios among dairy products.

• Slow-release casein: as in cottage cheese, most of the protein is casein, which breaks down slowly and supplies amino acids over hours — making it suitable for lasting fullness and for eating before bed.

• Fullness: trials compared high-protein Greek yogurt with snacks of the same calories and found greater fullness and lower intake at the next meal.

• Lactose tolerance: some people with lactose intolerance cope better with yogurt than with milk, but tolerance depends on the person and the amount. NIDDK guidance on eating with lactose intolerance.

• Vitamin B12, riboflavin (B2) and phosphorus: in meaningful amounts.

• Low sodium: only about 30–40 mg per 100 grams — a clear advantage over cottage cheese (about 364 mg) and over cheeses.

• Culinary flexibility: a substitute for sour cream, mayonnaise and cream in sauces and dips, with less fat and more protein.

Downsides and considerations

• Sugar in flavored versions: total sugars include both the natural sugar in milk and fruit and any added sugar. So don’t assume all the sugar in the pot is added sugar. Check the ingredient list and the amount of sugar per 100 grams. The FDA’s explanation of total and added sugars.

• Calcium: more protein does not guarantee more calcium. The USDA example has 115 mg per 100 grams, and the product you choose may differ.

• Price and sustainability: it takes 3–4 liters of milk to make a kilogram. The leftover whey was once a significant environmental problem for the industry, although today it is used to make protein powders and animal feed.

• Thickened “Greek-style”: products thickened with starch or stabilizers instead of straining — an inferior nutritional profile. Look for a short ingredient list.

• Milk protein allergy: unlike lactose intolerance, it requires complete avoidance. Straining concentrates the casein and does not reduce allergenicity.

• Saturated fat in full-fat versions: 10% Greek yogurt contains a significant amount of saturated fat. The 0–5% versions are common and suit most uses.

Practical use

Buy plain and sweeten at home: the single most meaningful step. Plain yogurt + fresh fruit + cinnamon or a little honey gives the same experience with a third of the sugar.

What to look for on the label: a short ingredient list (milk, cultures); a “live and active cultures” label; and no starch or thickeners — a sign of a “Greek-style” product that was not really strained.

Check the calcium: if yogurt is a main calcium source in your diet, check how much it actually provides. Other sources include hard cheese, whole-seed tahini (see Sesame Seeds) and tofu set with calcium sulfate.

In cooking: excellent as a substitute for sour cream and mayonnaise. But don’t boil it — the milk protein curdles and turns grainy. Add it at the end of cooking with the heat off, or stabilize it with a spoonful of cornstarch.

Before bed: a pot provides about 20 grams of slow-release casein — a mechanistically grounded practice for people who train.

Summary

Greek yogurt is thick and usually richer in protein than regular yogurt, but there is no fixed ratio between products for protein, lactose or calcium. For a useful comparison, check the values per 100 grams, the fat percentage and any added sugar. A plain version lets you control the toppings at home.