One ounce of the buttery nut packs 11% of the daily recommended value of zinc, an essential mineral that may help reduce anxiety. When researchers gave zinc supplements to people who were diagnosed with both anxiety symptoms (irritability, lack of ability to concentrate) and deficient zinc levels over a course of eight weeks, the patients saw a 31% decrease in anxiety, according to Nutrition and Metabolic Insights. This is likely because zinc affects the levels of a nerve chemical that influences mood. If you're already getting enough zinc, then it may not help your mood to chow down on cashews (or other zinc-rich foods like oysters, beef, chicken and yogurt). But, cashews are also rich in omega-3s and protein, so they're a smart snack no matter what.