Poor women!" sighs University of Michigan cardiologist Dr. Lori Mosca. "Every time a new study comes out, they have to revisit the decision they've made." That decision, of course, is the one that currently confronts millions of baby-boomer women just entering their menopause years: whether or not to supplement their bodies' flagging supplies of estrogen in hopes of preventing late-in-life maladies like osteoporosis and heart disease.
Making this decision has never been easy, and last week, alas, it got harder still. According to a study published by the Journal of the American Medical Association, the estimated 8.6 million American women...