Here is an article by the "Life Extension Folks" that address the issue and why you need to have your estrogen levels tested especially if you are a man over the age of 50 and also a diabetic.
THIS IS IMPORTANT INFORMATION. Please don't ignore it. There is a lot of hype about boosting one's testosterone lately and (me thinks) perhaps NOT enough about also checking and controlling estrogen levels at the same time. If you are on testosterone gels or creams or supplements, then you should ask your doctor to also test your estrogen levels or perhaps contact the Life Extension Folks and they can also do it. At the time of this post the test runs approximately $269.00 as opposed to upwards of $1000 at an outside lab or ordered by your doctor.
You need to know what your FREE testosterone levels and your estrogen levels are if you want to stay healthy and enjoy your later years.
Take a look.
Why Estrogen Balance is Critical to Aging Men
New Study Published in the Journal of the American Medical Association
Low Estradiol and Testosterone Predict Mortality in Aging Men
How Do Men Naturally Make Estrogen?
How Aging Men Can Control Their Estrogen Levels