A new study published in the journal Neurology suggests that soy protein may not be benefiting women in preserving the overall thinking ability in women over 45 years of age but may provide a small benefit in boosting memory which is responsible for facial recognition.
"Soy is a staple of many traditional Asian diets and has been thought possibly to improve cognition in postmenopausal women," said study author Victor W. Henderson, MD, MS, with Stanford University in Palo Alto, Calif., and a Fellow with the American Academy of Neurology. "Our study found long-term use of soy protein neither improved nor impaired overall cognition."
For the study, 313 healthy postmenopausal women between the ages of 45 and 92 were given 25 grams of soy protein daily, a dose comparable to that of traditional Asian diets, or a milk protein-matched placebo. Participants were also given tests that measured memory and other thinking abilities at the start of the study and 2.5 years later.
The study found that there was no significant change in test scores between the women who took the soy supplements and those who took the milk protein supplements. There was, however, a small improvement in visual memory, or facial recognition, in the soy protein group compared to the milk protein group by about 13 percent.
"Our study provides strong evidence that soy supplements should not be used by postmenopausal women with the main goal of enhancing overall cognitive ability," said Henderson. "On the other hand, a diet high in soy protein does not appear to have any harmful effect on thinking skills, either."
The study was supported by the National Institutes of Health, the National Center of Complementary and Alternative Medicine, the Office of Dietary Supplements and the Office of Research on Women''s Health.
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The American Academy of Neurology, an association of more than 25,000 neurologists and neuroscience professionals, is dedicated to promoting the highest quality patient-centered neurologic care. A neurologist is a doctor with specialized training in diagnosing, treating and managing disorders of the brain and nervous system such as Alzheimer''s disease, stroke, migraine, multiple sclerosis, brain injury, Parkinson''s disease and epilepsy.
For more information about the American Academy of Neurology, visit http://www.aan.com
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