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It doesn't know. That's stupid. I assume if it's cleared by shampoo then it has an easier time excreting more. It could also be that shampoo causes it to produce more in some way chemically, or that the oil shielded it from something that causes it to produce more. I don't know the mechanics of it, and I don't think there's been any research into it. All I can say is that my scalp seems to have stopped producing as much oil when I changed how I clean my hair.

I've seen one person post one article saying it isn't real. I read it. It doesn't have any research behind it. It only makes claims like the glands not having sensors. Sure, but many parts of our body perform differently based on different circumstances without sensors. To dismiss all the people with experience with no experience or evidence is pretty short-sighted. I'm sure that doctor is intelligent and knows her stuff to some extent, but she overreached with her conclusion without doing any analysis.

I think that it's because the scalp itself gets dried out from too much washing, so the glands respond to that.

When the scalp skin "normalizes" the hair slowly normalizes as well, since the oil travels down the strands.

That's my guess. I went from shampooing daily to every other day and at first I would get an itchy, gummy scalp. But eventually that gummyness worked it's way out. Every time I shampooed I would get that dry, gummy scalp the next day.

So eventually I shampooed less and less. Now I don't shampoo at all. I just rinse daily with water and massage my scalp.