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Originally Posted by FruitLoop
I'm not quite sure about this hormone thing, as I'm sure the story isn't much different in Canada where the use of growth hormones in dairy production is illegal. Rather it might be related to the increase in dietary fat, as sex hormones (such as estrogen and progesterone) are derivatives of cholesterol. Anorexia can mess up the mentrual cycle for this reason, as the body's fat reserves dry up. Also, the prevalence of childhood obesity can perhaps be linked to earlier fertility (higher fat proportion, etc). Then again, what I'm saying here comes from a couple of classes and some logical thinking, and my memory needs some refreshing (helloooo Pubmed!).
By the way pregnancy intervals were much longer before agriculture for this reason too, as the nomadic lifestyle of hunters-gatherers had a large impact on the body's fat reserves.
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those are theoritcal dangers, the above fact sheets speak of the presently accepted side effects which should be well considered before taking any sort of medication.