Mac Lockerd

Give it a couple more months and it'll turn into this:

There are many foods and herbs believed to improve brain health, but mostly with no solid evidence that they do what's claimed. No harm in trying though.
I'd like to point out the MIND diet, which supposedly supports brain function and prevents Alzheimer's.

In short, eat more of these:

Vegetables, green leafy vegetables in particular (spinach)

Berries, especially blueberries

Nuts (walnuts, almonds)

Beans

Wine (moderately)

Whole grains

Fish (tuna, sardines)

Poultry (chicken)

Olive oil

And less of these:

Fried or fast food

Red meats

Cheeses

Butter and stick margarine

Pastries and sweets

As for herbal remedies, the following are also worth considering:

Huperzia Serrata

Bacopa Monnieri

Mucuna Pruriens

Vinca Minor (Periwinkle)

Withania Somnifera (Ashwagandha)

Ginkgo Biloba

References:
http://www.mhrc.cc/articles/wicked-brain-herbs.html
http://www.livescience.com/57132-mind-diet.html