The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
If you're doing it as a very young child, it can-- that fat can become leptin resistant and it can produce more leptin, and that leptin can activate the hypothalamus, which activates the pituitary, which releases gonadotropin, which basically just increase testosterone and estrogen earlier than it otherwise would have.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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When I was growing up, it was thought, or at least people would say, that resistance training-- in particular, lifting heavy weights could stunt one's growth. Is that true or false?
It's the same mechanism behind why childhood obesity causes early puberty.
Typically in children they have relatively low body fat stores. Why is this important? Well, we know that one of the things that can trigger the onset of puberty-- in particular in females-- is that when enough body fat accumulates, that body fat releases a hormone called leptin, and that hormone leptin travels in the bloodstream, across the blood-brain barrier, and goes to the hypothalamus and can trigger the onset of puberty by activating the neurons that release gonadotropin-releasing hormone.