Several of my male patients who are troubled with low testosterone levels have also been found to have type 2 diabetes. In fact, the two conditions share many of the same symptoms (see more below) like erectile dysfunction and fatigue, which are usually symptoms that bring male patients in to see me. Balancing the two hormones of insulin and testosterone are not only important to a man’s sexual function but also to his overall good health – in fact, his life may even depend on it.