A process to ferment lactose and molasses, to obtain unicellular biomass is disclosed. The described process allows obtaining a product of high protein value which will be in the range of 50 to 90% for its application in the food industry. The process uses as a means of propagation whey of cheese or molasses, for the use by Kluyveromyces marxianus to obtain unicellular biomass and subsequently unicellular protein.
