Zinc is necessary to maintain normal serum Testosterone levels, whereby inadequate zinc levels prevent the pituitary gland from releasing luteinizing and follicle stimulating hormones, which stimulate testosterone production. Zinc also inhibits the aromatase enzyme that converts testosterone into excess estrogen. The testosterone to estrogen ratio in men declines with aging from a high of about 50:1 to half of that, or even a low of 10:1, resulting in higher estradiol activity, which subsequently increases the risk of heart disease, prostate cancer, Weight Gain, or even obesity... Full Text