India, Nov. 17 -- Kefir is a simple fermented drink made by mixing milk with kefir grains. According to a study published by Frontiers in Microbiology in 2015, kefir grains contain natural bacteria and yeast. As it ferments, the milk becomes slightly thick, tangy and full of active cultures. This makes kefir easier to digest than regular milk and gives you a constant supply of good bacteria for gut health.

Kefir originated in the Caucasus Mountains, which is a region between Europe and Asia. This place is famous for its long traditions of fermented foods; the word kefir is believed to come from the Turkish word "keif", which means "good feeling", referring to the sense of well-being people experience after drinking it.

A study conducted...