Fungal contamination negatively affects the production of cereal foods such as arepa loaf, an ancient corn bread
consumed daily in several countries of Latin-America. Chemical preservatives such as potassium sorbate are applied
in order to improve the arepa's shelf life and to reduce the health risks. The use of natural preservatives such
as natural fermented products in food commodities is a common demand among the consumers. Kefir is a milk
fermented beverage obtained by fermentation of kefir grains. Its antibacterial and probiotic activity has been exhaustively
demonstrated.