Many studies showed that women who took estrogen replacement therapy had lower incidences of heart attacks, strokes, Alzheimer's disease, and fractures of the spine and hip than similar women who were not taking such therapy. These benefits were plausible, as estrogens in test tubes increase arterial elasticity. That is, estrogens allow arteries to dilate, a sign that arteries are staying youthful. Also, estrogens increase the healthy or beneficial (HDL or high-density lipoprotein) cholesterol. So, women on estrogen replacement therapy had fewer heart attacks, strokes, and less memory loss.
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