BETHESDA, Md. — TV ads tout testosterone treatments for “low T,” but surprising new research shows a different hormone may play a role in less sex drive and more fat as men age. Estrogen — the female hormone — is needed by men, too, and the gives the first clear evidence that too little of it can cause certain “male menopause” symptoms.
“A lot of things we think are due to testosterone deficiency are
actually related to the estrogen deficiency that accompanies it,” said
Dr. Joel Finkelstein of Massachusetts General Hospital. He led the
U.S.-government funded study, which appears in Thursday’s New England
Journal of Medicine.