"Robert Seago" wrote in message
...
In article ,
BAC wrote:

In which case we probably don't regard the food source as toxic at all.
Or
not - in which case the toxins remain toxic to humans, and we presumably
have learned to avoid ingestion, or to process the food so as to reduce
the
toxicity to levels we consider acceptable. Similar to how we might deal
with
foods we know to have been treated with 'artificial' toxins, really.

TBH there will have been no pressure to make us more able to cope
withthese toxins, unless they had been potent enough to kill off
individuals before they breed.


I see what you mean, but a toxin does not have to be immediately fatal to
exert 'evolutionary' pressures. If it were to induce infertility, for
example, or increase the risk of birth defects, or debilitating illness, it
might well have eliminated 'bloodlines'.