Cashew nuts are a delicious and effective snack to fight against anxiety. Research has shown that two handfuls are equal to a dose of Prozac. The reason for this is because cashews are full of tryptophan, the precursor for the production of serotonin which is the ‘feel-good’ hormone. They also have magnesium, which the body requires for a healthy nervous system. Magnesium is used to treat anxiety and depression. You have cashews with your oatmeal for breakfast or snack on a fistful between meals.