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.  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