Popeye and NPR say to eat your leafy greens.
“…healthy seniors who had daily helpings of leafy green vegetables — such as spinach, kale and collard greens — had a slower rate of cognitive decline, compared to those who tended to eat little or no greens.”
In a study of 960 seniors, those who ate greens scored in the upper quintile for cognitive function and “the rate of decline for [those] in the top quintile was about half the decline rate of those in teh lowest quintile.”…
Aubrey, Allison. Eating Leafy Greens Each Day Tied to Sharper Memory, Slower Decline. NPR, Your Health. February 5, 2018. https://www.npr.org/sections/health-shots/2018/02/05/582715067/eating-leafy-greens-daily-may-help-keep-minds-sharp
Morris, M.C., et al. Nurients and Bioactives in Green Leafy Vegetables and Cognitive Decline: Prospective Study. Neurology, January 16, 2018. https://www.ncbi.nlm.nih.gov/pubmed/29263222