The Journal of the American College of Nutrition says otherwise.

"We began our analyses with the expectation that aculturation might be a risk factor for poor cognitive function in late life and that traditional Japanese lifestyle, culture and diet might be protective. Instead, we found that poorer cognitive test performance in later life was weakly associated with a more oriental midlife diet. As this finding was explored it became evident that the relationship with oriental diet could be attributed almost entirely to a single food item: tofu."

http://www.jacn.org/content/19/2/242.long
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