Meanwhile, we found out just a few years ago—again, someone finally asked the question—that a human girl’s hip fat may be one of the best predictors for when she’ll get her first period. Not her skeletal growth, not her height, not even her day-to-day diet, but how much gluteofemoral fat she has. That’s how important this fat is for reproduction. Our ovaries won’t even kick in until we’ve stored up enough of this fat to form a decent baseline. When we lose too much weight, our periods stop.
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