Abstract
Many species and strains of lactic acid bacteria (LAB) have been suggested to have several beneficial effects on the health of the digestive tract of humans. These benefits are produced by the antibacterial metabolites and specific cell components of several desirable intestinal indigenous bacterial species, particularly Lactobacillus acidophilus (group Al) and Lactobacillus reuteri and several Bifidobacterium species, and a few species of non-intestinal LAB, such as Lactobacillus bulgaricus, Streptococcus thermophilus, and Lactococcus lactis. However, study results using fermented dairy products produced by them or consumption of live cells of these species have not been consistent. The possible reasons for such controversies are discussed. In the concluding remarks possible means to overcome the controversies are suggested.
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