14 Foods You Should Eat To Increase Productivity

You've heard the saying for years now: you are what you eat.

But it's true. According to Psychology Today, complex brain processes are "literally fed by glucose that circulates from gut to brain."

"The human body is undeniably an energy system," says Florida State University psychologist Roy Baumeister. "Evolution gave us this new and more complicated way of acting, but it's expensive in terms of fuel burned. Being our better selves is biologically costly."

We've compiled a list of foods from Psychology Today and other sources that will improve the way you think and work.

Aimee Groth contributed to this report.