Might it be possible to supplement our gut flora with appropriate bacteria to make up for certain disorders related to diet? For instance, given inadequate vitamin C in the diet, what if we had vitamin-C-producing bacteria transplanted into our large intestine? It would be kind of like a scurvy vaccine.
Mokalus of Borg
PS - It might produce more problems than it's worth, though.
PPS - And I'm certainly not the one to be taking far-out medical advice from.