How many calories are in kefir?

One cup of plain lowfat kefir (243g) is 104 calories and half a cup is 52. Per 100g that is 43 calories, which sits between skim milk at 34 and whole milk at 61. A full 32 oz bottle comes to 418.

Kefir vs yogurt: which has more protein?

Greek yogurt wins by a wide margin. Kefir has 3.8g of protein per 100g against 10.2g for nonfat Greek yogurt, so a cup of each is 104 calories with 9.2g of protein versus 100 calories with 25g. Kefir's advantage is that you can drink it.

Is kefir keto-friendly?

At 4.8g net carbs per 100g it qualifies, but the cup does not. A full cup carries 11.7g of carbs, more than half a 20g keto day. Half a cup at 5.9g is the pour that actually fits.

How much calcium is in kefir?

130mg per 100g, so one cup delivers 316mg, roughly a quarter of the 1,300mg daily value. The same cup brings 416mcg of vitamin A and 2.4mcg of vitamin D, since the milk it is cultured from is fortified.

Is kefir lactose-free?

No, but it is lower than milk. USDA lists 3.7g of lactose per 100g in plain lowfat kefir, against about 4.8g in milk, because the cultures consume some during fermentation. Many people who react to milk tolerate kefir; that is individual, not guaranteed.

Does kefir contain alcohol?

Traces at most. USDA records 0g of ethyl alcohol in the plain lowfat product measured here, and commercial kefir is fermented to keep alcohol negligible. Homemade kefir left to ferment for days can go slightly higher.

Plain vs flavored kefir: how big is the difference?

About 47 calories a cup. USDA's strawberry lowfat kefir is 62 calories per 100g against 43 for plain, so a cup goes from 104 to roughly 151. Nearly all of that gap is added sugar.

Is kefir good for weight loss?

It is a cheap swap rather than a magic one. Trading a cup of whole milk (149 calories) for a cup of kefir (104) saves 45 calories and keeps 9.2g of protein. Flavored versions give most of that saving back.

How long does kefir keep once opened?

7 to 14 days refrigerated, and it keeps souring the whole time as the cultures work, though the 104 calories per cup do not change. Separation into liquid and curd is normal; shake it. A bottle that tastes fizzy and sharply yeasty has over-fermented.