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Probiotics are live microbial food supplements which benefit the health of consumers by maintaining or improving their intestinal microbial balance. Due to their perceived health benefits probiotic bacteria have been increasingly included in yoghurts and fermented milks during the past two decades. Most commonly they have been lactobacilli such as Lactobacillus acidophilus, and bifidobacteria often referred to as ‘bifidus’. A major development in functional foods pertain to foods containing probiotics and prebiotics which enhance health promoting microbial flora in the intestine. There is growing scientific evidence to support the concept that the maintenance of healthy gut microflora may provide protection against gastrointestinal disorders including gastrointestinal infections, inflammatory bowel diseases, and even cancer . The use of probiotic bacterial cultures stimulates the growth of preferred micro-organisms, crowds out potentially harmful bacteria, and reinforces the body's natural defence mechanisms. Today, plenty of evidence exists on the positive effects of probiotics on human health. However, this has usually been demonstrated in diseased human populations only. Thus there is an urgent need for evidence for probiotic health benefits in average (generally healthy) populations.