>Someon asked: How is it that new people will not be born by eating paleo?
>
>jean claude said:
>...there is a regulation of births and populations in wild animals and also
>in Huntergatherers.....This phenomenon is yet to receive plausible
>explanations...Malinowski studying the trobriand islands have noted the
>inability of teen agers to get pregnant despite a very rich sexe
>life....only the married women were getting pregnant.
>
>My response:


>I think a very natural explanation for this lies in the fact that in more
>primitive cultures, girls are generally leaner and reach menarche at much
>later ages, often at the age of 17 or 18.

I don't think it was the case those young women were menstruating , the
explanation that have been given had to do with competition of spermatozoids
from differents men inhibiting each over , The conception was happening when
the husband was chosen and free sex was not anymore .


jean-claude

If a girl menstrates later, but
>has sex at an early age, she is not going to get pregnant.  In many of
those
>cultures, the girls don't marry until after they begin to menstrate, hence
>the correlation with marriage and pregnancy.  Also, later age of menarche
>would mean delayed fertility, as some might not get pregnant until after
two
>or three years of menstrating.  Modern industrialized diets stimulate
overly
>high estrogen levels.
>
>Why is this?  It has been observed that Eskimos reach menarch at younger
>ages when they switch to modern diets.  Some have explained this as being a
>result of high sugar and vegetabel oil consumption, which lead to higher
>body fat and estrogen levels at younger ages, which stimulate earlier onset
>of menarche and fertility.
>
>If women are leaner, they will generally menstrate later, and thus delay
>fertility. Females eating Westernized diets are now menstrating at earlier
>and earlier ages.  This can be attributed to higher estrogen levels in the
>body, due to high carb,  high vegetable oil diets, excess body fat, as well
>as xenoestrogens in drinking water, and from foods stored and heated in
>plastic, and estrogenic hormones in commercial, conventional animal foods.
>Btw:  we can see that some girls are obviously chubby or obese at a young
>age; others may thin (i.e., not overtly fat) or average looking, but
overfat
>(i.e., they have very little lean mass and high overall percentage of body
>fat), which can lead to high estrogen levels none the less.
>
>My 2 cents worth.
>
>Rachel