In relation to the last bit, I suspect that the bit about ‘healthy hair’ is something in the cached thoughts/no evidence category. I haven’t had a haircut in something like five years, and while my hair would probably look a bit better if the ends were trimmed to be even, there’s nothing about it that seems unhealthy to me—the only noticeable change in that time is that it used to be wavy when it was short and straight when it was long, and now it’s somewhat curly (more than just wavy) even though it’s rather long. (I’m more inclined to attribute that to having moved to a more humid climate than to the lack of haircuts, especially given that I wasn’t getting it cut particularly often even back when it was straight.)
There could very easily be evidence that I don’t know of, but it’s a data point.
In relation to the last bit, I suspect that the bit about ‘healthy hair’ is something in the cached thoughts/no evidence category. I haven’t had a haircut in something like five years, and while my hair would probably look a bit better if the ends were trimmed to be even, there’s nothing about it that seems unhealthy to me—the only noticeable change in that time is that it used to be wavy when it was short and straight when it was long, and now it’s somewhat curly (more than just wavy) even though it’s rather long. (I’m more inclined to attribute that to having moved to a more humid climate than to the lack of haircuts, especially given that I wasn’t getting it cut particularly often even back when it was straight.)
There could very easily be evidence that I don’t know of, but it’s a data point.