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In this photo taken Friday, May 30, 2014, ingredients including; avocados, cacao powder mixed with cinnamon, lemons, kale, lettuce, blueberries and supplements, are displayed at the home of cookbook author Paula Wolfert in Sonoma, Calif. 

Wolfert spent more than 50 years researching and writing about food. Now, she’s enlisting food as an ally in a fight to stay mentally sharp. By Michelle Locke. (AP Photo/Rich Pedroncelli)

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