Taking daily soy supplements doesn't improve thinking and memory skills or keep them from declining in older women, new findings suggest.

The study of 313 postmenopausal women showed those who took 25 extra grams of soy protein each day improved slightly more than other women on a test of visual memory, or remembering faces. But there was no difference in their overall cognitive skills, compared to women who were given regular milk protein.

Studies have typically come to conflicting or disappointing findings on the role of soy in easing hot flashes and other symptoms of menopause.