Japanese Guts Are Made For Sushi
cremeglace writes "Americans don't have the guts for sushi. At least that's the implication of a new study, which finds that Japanese people harbor enzymes in their intestinal bacteria that help them digest seaweed, enzymes that North Americans lack. What's more, Japanese may have first acquired these enzymes by eating bacteria that thrive on seaweed in the open ocean."
The article states clearly that:
Gene transfer from the living bacteria transferred into the Japanese people's genome that produces enzymes in the gut that make breaking down seaweed easier (i.e. they get more from it).
They didn't say you couldn't eat seaweed and that it was bad for you if you don't have these enzymes, just that it's better for you if you do.
Primarily the Mother - in cases of vaginal birth. Breastfeeding, touching, etc add more. The infant is pretty well colonized within 1-6 months.
Wikipedia article on Gut Flora
http://en.wikipedia.org/wiki/Gut_flora#Acquisition_of_gut_flora_in_human_infants