hormone estrogen

Obesity and a sedentary lifestyle appear to increase the risk for an uncommon but aggressive breast cancer that is not fueled by the hormone estrogen, a surprising new study shows.

(Johns Hopkins Medical Institutions) Researchers at Johns Hopkins are reporting what is believed to be the first conclusive evidence in men that the long-term ill effects of vitamin D deficiency are amplified by lower levels of the key sex hormone estrogen, but not testosterone.