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ELI5... why do we have puppy fat as teenagers?
(piefed.blahaj.zone)
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It takes a phenomenal amount of energy to grow the body, so the body will reserve energy supplies in anticipation of growth spurts.
The biggest aspects are brain and skeletal development.
A lot of people think that "getting pudgy" around age 24-27 is somehow the metabolism magically changing, but it's brain and body growth stopping.
Also because that's when many people settle into their drinking habit and stop exercising