> Richard Archer wrote:
>
> I refer you to this page for a classic textbook description of
> nitrogen metabolism:
> http://www.indstate.edu/thcme/mwking/nitrogen-metabolism.html
>
> Note especially the bits about ammonia and how it's a neurotoxin.

According to the link provided excess ammonia (NH3) will only occur if the
primary protein source is plant protein which lacks certain amino acids, or
if person has a genetic disorder that results in a degraded ability to
produce one of the enzymes needed in the Urea cycle.

-Tad