Because in modern society, there is less evolutionary pressure.  As we develop technologies that allow reproduction and survival in spite of issues, there is less "natural selection".  That's my take - if you even believe in evolutionary pressure. 

-----Original Message-----
From: Lactation Information and Discussion [mailto:[log in to unmask]] On Behalf Of Sara D. Roos
Sent: Sunday, April 25, 2010 9:10 PM
Subject: tongue-tie prevalence

Wow; 3-5% incidence for a potentially lethal problem seems so high! 
I guess I was wondering what evolutionary pressures would permit continuity of this sort of problem.  But if the term is heterogeneous the way Rachel describes, with many different underlying causes ranging from submucosal attachment to mechanical birth-related issues figuring into that number, then perhaps it's not so high as all that. 
That is, true "inherent" (as opposed to 'environmental') tt may not be as prevalent as all that.

Interesting; thanks!
-- 
	-S, roving evolutionary-biogeological-biostatistician-LLLL
(make that procrastinating, not roving).

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