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Because even though it's not technically yogurt, the nutritional profile is almost identical. Plain skyr serves up 100 calories, 17 g of protein, 0 g of fat, and 3 g of sugar per 5 oz serving, compared to nonfat Greek yogurt's 80 calories, 15 g of protein, 0 g of fat, and 4 g of sugar. And both deliver 15% of your daily calcium.
If you're looking for a nonfat, high-protein source of fermented dairy, you'd do well choosing skyr or Greek yogurt. "Nutritionally, they offer the same benefits. It really comes down to taste and texture, and which you prefer more," says registered dietician Sarah Pflugradt. Compared to Greek yogurt, skyr is slightly thicker and less tangy, kind of like crème fraîche. So if you always secretly wished your Greek yogurt was just a little bit less mouth-puckering, skyr might be the stuff for you.
The one exception? If you're after more fat or calories, opt for low-fat or full-fat Greek yogurt. (Unlikely? Maybe. But still good to know.) Since skyr is made from skim milk, it's always nonfat.
One last thing to keep in mind: Like Greek yogurt, there are lots of flavored skyrs out there. Though tasty, they tend to be higher in added sugars, so steer clear. If you want to gussy up your skyr, try fresh fruit, honey, or maple syrup, so you can control how much sweetness goes in.