....both men and women have more of certain chemicals in the tears they shed because of emotional reasons...Among these substances are the hormones prolactin (associated with milk production) and adrenocorticotropic hormone (ACTH), and the neurotransmitter leucine enkephalin, all of which are released when the body is under stress....Dr. Frey speculates that because women’s tears show significantly higher levels of prolactin between the ages of 15 and 30, the difference could be associated with frequent tears, to excrete the excess. It has also been suggested that prolactin itself stimulates tears in both sexes.Frey is the author of Crying: The Mystery of Tears.
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