Effects of Fermented-Milk Administration on Fecal Microflora and Putrefactive Metabolites of Healthy Adults and Healthy Elderly Persons

Abstract

Fermented milk prepared with Lactobacillus acidophilus SBT2062, Streptococcus salivarius subsp. thermophilus SBT1035 and Bifidobacterium longum SBT2928 was administrated at 250 g/day for 20 days to 10 healthy adults (eight men, two women, average age 36.1 years) and 11 healthy elderly persons (two men, nine women, average age 78.5 years). Although numbers of predominant bacteria of the fecal microflora (Bifidobacterium, bacteroidaceae, Eubacterium, etc.) were not changed by the administration of fermented milk, the number of Clostridium perfringens and the content of fecal-putrefactive metabolites such as p-cresol, indole and ammonia were decreased in both subject groups. However, stool frequency and fecal pH were not changed by the administration.