Kefir is a slightly acidic and alcoholic fermented beverage that originated in the Caucasian region of Asia and is traditionally produced by adding kefir grains (a consortium of bacteria and yeasts in a polysaccharide matrix) to milk [1] and [2]. However, in Latin America, the grains are also cultivated in brown sugar solutions in private households [3] and [4]. Kefir may be classified as a functional food due to its reported beneficial effects on the health and welfare of humans