Archiver > GENEALOGY-DNA > 2005-06 > 1117823268

From: Crystal <>
Subject: Re: [DNA] Lactose intolerance and Ancestry
Date: Fri, 3 Jun 2005 11:27:48 -0700 (PDT)
In-Reply-To: <>

He was immediately put on cow's milk but
> turned out to be
> > severely lactose intolerant and was switched to
> sugar water.

I'm not sure if anyone has pointed this out (behind on
the emails) but there are other (more probable)
conditions than being lactose intolerant for infants
not to be able to tolerate cow's milk. Lactose
Intolerance usually occurs after weaning - when the
infant matures the mechanism to produce the enzyme is
"turned off" (which is how it is in most of nature -
some humans have genetically adapted to retain the
ability but of course not all humans). So if not
lactose intolerance? First the person could be
allergic to cow's milk. This is different than an
intolerance. Intolerance = no enzyme to digest
lactose (milk sugars). An allergy elicits a different
response mechanism (histimine, etc.). The second
typical problem is that cow's milk proteins are like
twice the size of human milk and infants can't break
them down (metabolize them). That is why some
children "grow out of it" at one, two or three years
of age as their digestive system matures enough to
handle the cow's milk. Why some children's digestive
tracks have a more difficult time I'm not sure.

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