According to the World Health Organization, probiotics are living microorganisms that, when administered in adequate amounts, confer a health benefit on the host (ftp://ftp.fao.org/es/esn/food/wgreport2.pdf, 2002). Research suggests that these benefits are due, in part, to the effects probiotic bacteria have on a wide range of intestinal functions. Several different types of probiotic cultures (L. casei, L. acidophilus, L. plantarum, B. bifidum) are being introduced in an expanding variety of dairy products around the world. Daily consumption of probiotic foods, such as yogurt and cultured dairy drinks, may be beneficial in one of several ways (Gill et al., 2004). Some of these probiotics help strengthen the body's natural defenses by providing a regular source of probiotic bacteria for the intestinal tract; some might provide a much-needed source of calcium for individuals who are unable to consume most dairy foods because of lactose-intolerance; and some may help to correct a potentially imbalance of the intestinal microflora (Adolfsson et al., 2004). Several studies have shown that regular consumption of some probiotics helps maintain the balance of the intestinal microflora, which can have a wide range of beneficial effects.