 Studies with infants and adults have shown that foods or drinks enriched with galacto-oligosaccharides result in a significant increase in bifidobacteria.Human gut microbiota play a key role in the intestinal immune system.Galacto-oligosaccharides support natural defenses of the human body via the gut microflora, indirectly by increasing the number of bacteria in the gut and inhibiting the binding or survival of "Escherichia coli", "Salmonella" Typhimurium and "Clostridia".