I was never diagnosed by a doctor, but I had been SEVERELY insulin resistant for over 3 years. Back in 2003 I was drinking tons and tons of beer, and was very stressed out all the time by my job, both of which helped lead me to insulin resistance.
I first started losing my hair in January of 2003. Coincidentally this is exactly the same time I started becoming reactive hypoglycemic and hyperinsulinemic (looking back). This was in a classic pattern. First the hairline, then gradually my crown started to thin.
4 years later I still look good, but it's VERY obvious it had progressed toward where my dad is now, except much sooner and much faster.
My dad is also pre-diabetic, but his blood sugar issues are not near as severe as mine were. His hair loss, respectively, was much slower, much more gradual, and started later in life.
I think insulin resistance is the actual cause, or atleast CAN be a cause of MPB. Not too sure if you other guys were seeing this type of loss, or a telogen effluvium.
However, when I switched to a ketogenic diet (along with this thing called the Scalp Exercise I've been doing for a couple years) I started seeing a few terminal hairs come back at my hairline and have tons of tiny brown hairs that are growing a little bit longer with each cycle. This diet is all meat. I only eat meat, nothing else. No veggies, no carbohydrates, no grains, nothing. Just meat.
Also, when my blood sugar was out of control my scalp was nasty (not to mention my over all health). It was greasy, scaling, bleeding and had eczema all over. Now the I've reversed my blood sugar problem, it's as smooth as a baby's butt.
Also, now when I work out, run or do something that gets my blood pumping when I touch my scalp it tingles. It's a weird feeling that goes from the top of the hairline back to the vertex. I believe this is because the scalp is being stimulated again, and it's no longer being destroyed by DHT. It sure didn't feel like that when I was insulin resistant.
It's only been a couple of months, so I haven't seen my density return completely yet. But I'm seeing new terminal hairs ALL OVER my hairline popping up.
Here take a look at this article I wrote on my theory about hair loss
http://www.healthmad.com/Nutrition/Hair-Lo
ss-and-Insulin-Resistance.32349