Recently, something interesting happened to me: suddenly I saw everyone in my circle start talking about kefir. First it was turmeric, then matcha, and now it turns out this fermented drink has become the morning star for anyone looking to take better care of themselves.

The thing is, kefir isn’t as new as it seems. Historians place it in the mountains of the Caucasus, and its name comes from the Turkish word keif, which means good feeling. It makes sense because when I started researching the benefits of kefir, I found that there’s actually quite a bit of science behind it.

Basically, kefir is a fermented beverage prepared by adding kefir grains (also called Bulgarian grains) to milk or sweetened water. Over 12 to 48 hours, bacteria and yeasts transform lactose into lactic acid, creating that slightly acidic drink you see in supermarkets. The interesting part is that you can buy it ready-made or make it at home by reusing the same grains.

So, why has so many people gotten hooked on this? A cup of low-fat kefir has 104 calories, 9 grams of protein, 36% of your daily calcium needs, vitamin B12, riboflavin, and other nutrients your body appreciates. But what really sets it apart is the number of microorganisms. While yogurt contains few species, kefir can have up to 61 different strains of bacteria and yeasts. It even contains Lactobacillus kefiri, which is exclusive to this beverage and has shown antibacterial properties against pathogens like E. coli and Salmonella.

The most commonly mentioned benefits of kefir are related to digestion. Probiotics help balance the gut microbiome, meaning less inflammation, fewer gases, and overall better digestion. Studies suggest it works well for irritable bowel syndrome (síndrome de intestino irritable) and other digestive issues, although more human research is still needed.

Another plus: it contains calcium, phosphorus, vitamin D, and vitamin K, making it relevant for bone health. Evidence shows that daily kefir consumption improved bone mineral density in people with osteoporosis. Additionally, some studies indicate it could help control blood sugar levels and reduce LDL cholesterol, though I acknowledge we still need more data to be completely sure.

One thing I liked to learn is that during fermentation, much of the lactose converts into lactic acid, making it easier to digest for those with lactose intolerance. It’s not completely lactose-free, but definitely better tolerated than regular milk.

Of course, like with everything, there are considerations. Initially, it may cause gases or changes in bowel movements as your system adapts. It contains traces of alcohol from fermentation. And if you have a compromised immune system, it’s best to consult a doctor before starting.

In summary, kefir positions itself as a fermented food with a pretty complete nutritional profile and microbial diversity not seen in other dairy products. Many of its benefits are still under research, but the available evidence suggests it’s really worth including in your diet if you’re looking for healthier options. Whether buying it ready-made or cultivating your own Bulgarian grains at home, it seems this kefir trend is here to stay.