Functional non-digestible food component that stimulate the activity or the growth of bifidobacteria and lactic acid bacteria in the digestive system. Both of them are considered to have several beneficial effects on the host, especially in terms of improving digestion and effectiveness and intrinsic strength of the immune system. According to the FAO (2001) definition, probiotics are “live microorganisms which when administered in adequate amount confer a health benefit on the host”. They are commonly consumed as part of fermented food (eg. yogurt, dietary supplements).