From "Effects of Various Soybean Products on Flatulence in the Adult Man." at http://ebm.sagepub.com/content/121/4/1235.short http://ebm.sagepub.com/content/121

From "Effects of Various Soybean Products on Flatulence in the Adult Man." at http://ebm.sagepub.com/content/121/4/1235.short http://ebm.sagepub.com/content/121/4/1235.short "Conclusions: In 4 human male subjects, kept on a carefully controlled diet to which various fractions of soybean meal were added, the flatus-producing factor in soybeans was concentrated primarily in the low molecular-weight constituents. These experiments also showed that the soybean hulls, fat, water-insoluble polysaccharides, and protein are not associated with flatulence production to any significant degree. Caseinate and soybean proteinate appear to inhibit flatulence. When equivalent amounts of navy bean meal were consumed, flatus volumes increased 2.52 times that following the consumption of dehulled, defatted soybean meal."