What does the food you eat have to do with how your brain functions? Turns out an awful lot. While we’ve always known that what we eat affects our bodies and how we look, scientists are also learning more and more that what we eat takes a toll on our brains. Yes, brain foods matter (especially for our gray matter). See, our bodies don’t like stress. Who does? When we’re stressed out whether it’s physical, like someone jumps out at you from a dark alley, or mental, like you have a major project due at work our bodies release inflammatory cytokines.