> -----Original Message-----
> From: Paleolithic Eating Support List
> [mailto:[log in to unmask]] On Behalf Of Todd Moody
> Sent: Thursday, March 01, 2007 9:49 PM
> To: [log in to unmask]
> Subject: Re: "Walking With Cavemen" - bacteria? no problem!
> 
> Paleo Phil wrote:
> >> This may be an area where the "blood type diet" theory has some
> merit.
> >> It is a fact that people with type A blood make less gastic HCl than
> >> those with type O blood.  It also appears to be true that the
> frequency
> >> of type A blood in human populations increased about 40,000 years
> ago,
> >>
> >
> > Interesting, do you have a reference where I can learn more on this?
> >
> 
> Nothing that I can put my hand on, unfortunately.  When Peter D'Adamo's
> "Eat Right 4 Your Type" book came out, we had a flurry of discussion
> about it on this list, and I did a little research at that time.  I
> recall that I was able to confirm that type As produce less gastric
> HCl,
> and that the A phenotype became more common about 40,000 years ago.
> There's also a difference in production of alkaline phosphatase.
> D'Adamo claims that this makes type As less able to digest fat, but I
> was never able to find support for that.

I searched the archives, but the only thing I found that comes close to that
is this:

Date:         Tue, 29 Jul 1997 08:10:52 -0400
Reply-To:     Paleolithic Eating Support List
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Sender:       Paleolithic Eating Support List
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From:         Todd Moody <[log in to unmask]>
Subject:      Type A mistake
Content-Type: TEXT/PLAIN; charset=US-ASCII

I wrote yesterday that type A appeared about 38,000 years ago,
and began to proliferate about 12,000 years ago.  This was a
mistake, based on misreading a chart.  Type A appeared about
20,000 BCE and began to disperse/proliferate about 10,000 BCE.
One result is that the Native American races, including the
Eskimos, are (or were) exclusively type O. ....

Since the type A and B blood types are millions of years old, this is
clearly wrong, which I think we agree on. A web search did not reveal any
mention of an increase in type A phenotype around 40,000 years ago, though
searching for such a thing is difficult because there is so much of the
D'Adamo misinformation on the Web that clouds the searches.

> I'm more persuaded by that evidence than by my half-baked conjecture,
> frankly.  Still, the differences in HCl production are interesting,
> including the fact that dogs and cats produce more than humans.  It
> seems likely that the HCl has a purpose beyond adjusting the pH to
> activate the protease enzymes, so it certainly makes one wonder what it
> is.

Yes, that is interesting. Is there anywhere we can look for more info on
these differences in HCl production by blood type?