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There are two possible explanations for an earlier age of menstruation. First, many girls (at least in the wealthier nations) are better nourished than people usually were at earlier historical periods, and good nutrition aids in the process of maturation. Secondly, synthetic female hormones are fed to cattle to accelerate their growth, and a certain amount of this gets into the beef that we eat. This too could be affecting young girls.

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Q: Why do you think girls now begin to menstruate earlier than they used to?
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