Skyr

Skyr has 58 kcal per 100 g.

Skyr contains 10 g of protein per 100 g.

Yes — 10 g of protein per 100 g, supplying 74% of its calories. That makes it a good protein source.

With 3 g total carbs (about 3 g net carbs) per 100 g, it fits low-carb and keto eating patterns in normal portions.

Yes — just 36 mg per 100 g (2% of the daily value), which qualifies as low sodium.

Nutri-Score weighs negatives (calories, sugar, saturated fat, sodium) against positives (fiber, protein) per 100 g. It collects almost no negative points (low sugar, saturated fat and sodium); points in favor come from protein (10 g). Overall that places it in band A.

About 172 g of Skyr equals 100 kcal. It is a relatively low energy-density food, so portions can be generous.

Per 100 g it has 3 g sugar and 0.2 g fat (0.1 g saturated). Fat provides 4% of its calories, so portion size matters most here.