That the female hormone estrogen is at work is suggested by several of the large study’s findings. From 1964 to 1973, the undertaking enrolled female members of Kaiser Permanente ages 40 to 55. Researchers initially collected data on the number of children the women had birthed, how many miscarriages they had suffered, and the ages at which they began and ceased to menstruate. In addition to recording the women’s race and educational levels, they tracked other midlife health conditions, including smoking, high blood pressure and obesity, which are known to influence dementia risk.

Source: Los Angeles Times July 23, 2018 20:13 UTC