Functional and nutritive values were also enhanced by applying microorganisms with a high GABA producing ability to the production of the yogurt. We have estimated the cost of the production of GABA soya yogurt as $1.3/L which is a little higher than that of the traditional yogurt of $1.0/L. Although the price is a little high, we expect that consumer will choose that kinds of yogurt, respecting quality and functionality rather than price. It has been reported that GABA production confers resistance to an acidic pH in Lactococcus lactis and Escherichia coli (Sanders et al., 1998; Castanie-Cornet et al., 1999