The body of evidence suggests a clear connection between foods, overall diet and our brain health, including memory and other cognitive skills such as attention and executive function (ability to organize and plan), and is growing each year.
Some ways specific foods could enhance brain health include increasing the availability of the memory neurotransmitter acetylcholine in the brain (apple juice, sage, almonds and walnuts helped Alzheimer transgenic mice perform better in cognitive tests and lowered levels of A- Another study led by Jon Valla in Arizona uses a combination of fruit and vegetable powers, anti-inflammatory spices and herbs, and fish oil, yielding some positive results in TG mice
From:
http://brainwellness.com/nutrition/memory-impact-of-nutrition/