basically like. why do women just have breasts all the time when to my knowledge the only purpose of them is to feed children. why don’t they go away like other mammals’ when you haven’t had a child.
In: Biology
Humans have had a unique evolution. My favourite hypothesis (because we don’t actually know) about Permanent breasts is that they evolved early in Homo Ergaster as a by product of other evolutions.
An increase in subcutaneous fat tissue as a response to a need to store more energy for the big human brain, and thermoregulation. More SFT increased hormone levels, including estrogen.
We had more and more evolutions to support the energy needs of our brain which increased fat deposits which increased hormone levels which caused more fat deposits.
These permanent fat deposits then became a secondary sex characteristic.
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