Walnuts! That’s according to Dr. Lenore Arab, a disease prevention expert at UCLA. Walnuts also have a good dose of healthy fatty acids – that improve your metabolism and help you feel full. But on top of all that, a big reason why walnuts make a good WORK snack is because of how they affect the brain. According to Dr. Arab’s research, people who eat walnuts outperform non-walnut-eaters in terms of memory, concentration, and “information processing speed.” All you need are 6 or 7 walnuts a day to get a mental edge over your coworkers and improve your overall health.