prebiotic definition

A prebiotic is a non-digestible fermented food substance that fosters the proliferation and activity of good bacteria in the intestinal tract.  When a prebiotic and a probiotic are put together, they create a “symbiotic.”  Kefir and yogurt are considered to be symbiotic because not only do they host live, beneficial bacteria, but they also contain the fuel or food that the probiotic bacteria needs in order to survive and thrive in the digestive tract.