昏昏的银杏说好像证据不够，虽然补品柜台都在卖。

http://www.scientificamerican.com/article.cfm?id=fit-body-fit-mind

引用：

Although the idea of exercising cognitive machinery by performing mentally demanding activities—popularly termed the “use it or lose it” hypothesis—is better known, a review of dozens of studies shows that maintaining a mental edge requires more than that. Other things you do—including participating in activities that make you think, getting regular exercise, staying socially engaged and even having a positive attitude—have a meaningful influence on how effective your cognitive functioning will be in old age.