Hoppi said:
Bryan, it's entire purpose according to modern medical literature is to mop up and regulate sex hormones.
I don't believe that to be true (that the modern medical literature makes such a fanciful claim as that). Show me something from the medical literature that says that SHBG "mops up" and "regulates" sex hormones (in the specific sense you mean)!
Hoppi said:
It seems pretty well documented to me, why do you think it's such a mystery?
I haven't seen any documentation for it at all. I don't think YOU have, either. Your problem, Hoppi, is that you read things about SHBG here and there on the Internet, and then you draw your own very dubious
inferences from it.
Hoppi said:
And are you really talking about that question about the brain increasing androgens to match mopped up free T? The whole point though is that that testosterone is in EXCESS of what should be in the body, hence one of the major reasons you can trigger hair loss. There is a reason why the first thing a nurse said to me when I mentioned I was losing hair is "hmm maybe you should get your testosterone levels checked..."
It's because SHBG should be at a certain concentration, and when you start lowering it or otherwise lifting unnecessary testosterone above a certain level, it can create problems. Your body simply does not need THIS much testosterone free in the blood.
The point here is that it's your BRAIN which determines what it thinks is the correct level of androgenic stimulation, not a protein which circulates in your blood.
Hoppi said:
I would really like to see evidence that says that when SHBG is increased to healthy levels (preferably not by injection but while actually being produced by the liver), the brain increases testosterone production, because that really makes no sense to me.
Do you _really_ think that the brain doesn't closely monitor levels of androgens in the body?? Try reading any textbook on endocrinology, and you'll find out about that in a hurry!
Question: when you take a pure antiandrogen (like flutamide, for example), why does your body go into a frenzy of making more testosterone? Answer: because your brain "sees" less androgenic stimulation going on, so it forces the testes to start making more testosterone.
Question: when bodybuilders start taking steroids to help build their muscles, why do their testes start to shrink? Answer: because their brains "see" more androgenic stimulation, so they start to shut-down testosterone production in the testes.
See what I'm saying? Generally speaking, any change you make in the level of androgens in your body will tend to be fought by your brain, which monitors those levels of androgens, and takes the appropriate actions to maintain the levels which _it_ thinks are correct.
So we get back to the question I asked before: if you were to inject an external quantity of SHBG into your bloodstream every day, what would your body's reaction to that be? Would it start to get alarmed when it "sees" less androgenic stimulation around, and send the chemical signals to your testes to force them to start making more testosterone? I think the answer to that question is probably "yes" (although I'm glossing-over certain other additional considerations here).
Hoppi said:
My thoughts on SHBG are also not just expressed by me alone, they are supported by pretty much everyone I've ever spoken to that has researched it at all.
I seriously doubt that. I don't have a problem with the very basic facts (like how SHBG binds to sex hormones, rendering them inactive); the problem is when you start going past that simple kindergarten-level of understanding, and start trying to draw additional inferences like how SHBG supposedly "mops up" excessive testosterone. At that point, I think you're on verrrrry thin ice!