On the other hand, many people may find the taste of soymilk
undesirable (Liu & Lin, 2000).Wang, Yu, and Chou (2002) indicated
that the presence of indigestible oligosaccharides such as stachyose
and raffinose and the raw bean flavor have limited the wide consumption
of soymilk and other soybean products. Stachyose and
raffinose are the principle oligosaccharides found in soymilk, and
believed to cause flatulence in human after eating soybean foods.