Bebida ou alimento laticínio fermentado

摘要

Provided is a method of assessing the extent to which Bifidobacterium bacteria in a Bifidobacterium-bacteria-containing fermented milk food or drink reach the intestines when the food or drink is orally administered to human beings, which comprises subjecting the fermented milk food or drink to successive treatments with an acid and bile, and measuring the bacterial viability after the treatments. The present invention makes it possible to conveniently and accurately assess the extent to which Bifidobacterium bacteria in a fermented milk food or drink reach the intestines.