A walnut looks like the brain, has a left and right hemisphere, upper cerebrums and lower cerebellums. The folds and wrinkles of a walnut resembles the human organ: the brain. The shape of the nut even approximates the body part, looking like it has left and right hemispheres. And it’s no surprise walnuts are nicknamed “brain food”—they have a very high content of omega-3 fatty acids, which help support brain function.” The wrinkles and folds mimic the neo-cortex.