Dragon
Member
In my opinion the cranial expansion theory has no validity. A bigger skull does not cut blood flow. Or rather a rapidly expanding skull would not stop blood flow. The body can create new blood vessels far quicker than bone. I think hair loss has entirely to do with mitochondria health. If it was a matter of bone growth then balding would naturally be perceived as attractive.
well, as I recall the seminal paper on this, there was quite a bit of correlational evidence.
In that research, the issue wasn't about 'creating blood vessels' anyway. It was about increasing -tightness- of the scalp, compressing the tissue, and thus atrophying/thinning it. Specifically, the compression/tension led to a thinner layer of -subcutaneous fat- in the scalp.
By the way, more recent research has shown that follicles often die due to a shortage of stem cells to keep them rejuvenated. And interestingly, they discovered that the stem-cells reside/thrive in....the subcutaneous fat-layer.
I note that it's common to hear the words "paper thin" or "parchment like" in descriptions of old men's scalps. just sayin'... :)
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