I have heard this but it is not something I have given much thought to.
What I think about when I hear these kinds of stats, is the fact that we never had the luxury of studies going back in history, for us to really be able to come to a truly valid conclusion. As currently as 100 year ago, girls were generally getting their periods by the time they were 12, at the latest. If you really think about it, most young women historically were married off by the time they were 16. Going back further in time, some were married as young as 8 or 9. In any event, you have to figure that they came into their menses by that age for them to be considered marriage material.
If it truly is tied into weight, then we do have a serious problem. The logical conclusion would be, as we live longer, wouldn't it make sense that our bodies would develop as adults later, rather than earlier?
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