by 
Anonymous
ANSWERS: 2
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I can't give you the particular biological mechanism, but in a nutshell, a malnourished body is not in a position to support a pregnancy. It's essentially a defensive reaction, as is slowing down metabolism. I believe it has to do with the role body fat has in the production of estrogen, so that if body fat is below some ratio, there is not enough estrogen to trigger ovulation.
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For the relationship between fat and estrogen, see this AB question/answer, http://www.answerbag.com/q_view.php/30255
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