Here is a big enough cohort to make an adequate conclusion.
1: Cent Eur J Public Health. 2006 Jun;14(2):78-81. Links
Association of insulin resistance linked diseases and hair loss in elderly men. Finnish population-based study.Hirsso P, Laakso M, Matilainen V, Hiltunen L, Rajala U, Jokelainen J, Keinanen-Kiukaanniemi S.
University of Oulu, Department of Public Health Science and General Practice, Finland.
[email protected]
Previous investigations have shown an association of androgenetic alopecia (Androgenetic Alopecia) with insulin resistance related disorders such as ischemic heart disease. An association between Androgenetic Alopecia and anthropometric abnormalities linked with insulin resistance and heredity in women aged 63 years has also been shown. We therefore compared 63-year-old men with Androgenetic Alopecia and ones with normal hair status for insulin resistance linked parameters.
A population of 245 men aged 63 years, who were participants in a population-based cross-sectional study in the City of Oulu, underwent a medical check-up including
assessment of hair status on the Hamilton-Norwood scale and determination of anthropometric measures, blood pressure, fasting glucose and serum lipids. Fifty eight per cent of the men reported extensive hair loss (grade III-VII).
Hypertension and the use of antihypertensive drugs were common among men with Androgenetic Alopecia (61% vs. 45% and 50% vs. 26%, respectively). The rates of diabetes and hyperinsulinemia (21% vs. 12% and 61% vs. 49%) were higher among men with Androgenetic Alopecia compared to those with normal hair status but no difference was seen in other factors. Our findings show that Androgenetic Alopecia is common among Finnish men aged 63 years but that it is also associated with insulin linked disturbances, such as hypertension and diabetes. Such men developing Androgenetic Alopecia might benefit from attention in medical check-up.
So, as you can see not all men with Androgenetic Alopecia suffer from hyperinsulinemia and not all men with Androgenetic Alopecia suffer from other pathologies. The rates are higher, but not higher in every male.
There is a link, but not every man in this study has the problems that you say that EVERY SINGLE man with male pattern baldness seems to have. In fact, it's more like half. That's not good enough. There's a link, but it's not the cause of the disease. Not even close.