“…Currently the main market for this beverage is in the United States, Japan, France, and Brazil, where it is consumed for its reported functional properties (Fiorda et al., ). The water kefir grain inoculum, and the nature of the substrate (such as the type of fruit used) determines the grain growth, the microbial species diversity, the metabolites formed, and their concentrations (Laureys, Aerts, Vandamme, & De Vuyst, ; Laureys & De Vuyst, ; Laureys, Van Jean, Dumont, & De Vuyst, ). In general, the microbiota of water kefir is known to be a stable consortium of different LAB (such as Lactobacillus, Leuconostoc ), AAB ( Acetobacter, Gluconacetobacter , and Gluconobacter ), and yeasts ( Kluyveromyces, Brettanomyces, Pichia , and Saccharomyces ).…”