Kefir is an underrated dairy product that's full of healthy probiotics, but it does have a limited shelf life. Here's how long kefir will last in the fridge.

Calories. An 8-ounce serving of kefir has 139 calories. About 40% come from protein, another 40% from carbohydrates, and the remaining 20% from fats.

Since kefir is dairy-based, it unfortunately isn't suitable for those following a plant-based diet. However, McAllister recommends other naturally fermented products, like sauerkraut, kimchi and miso.

The benefits of drinking kefir include better gut health, brain health, and immunity. Here’s what happened when one writer tried drinking it daily.