Dietary Practices

• A diet heavy in fatty foods or sugars appears to have an association with depression. A study conducted by the University of Melbourne found that women who consumed a balanced diet of whole grains, vegetables, meat and fruit scored lower on a standardized depression questionnaire than those who subsisted on fried, sugary, processed or refined foods, as reported by the American Journal of Psychiatry.
  
  

Blood Sugar

• People whose blood sugar levels suddenly spike or drop can suffer mood changes, becoming cranky, jittery or depressed, according to CBS News. Eating small, nutritious meals or snacks at regular times can keep blood sugar levels stable and prevent mood swings.
  
  

Specific Foods

• Foods that support consistent and positive moods include fruits, vegetables, nuts, fish, whole grains, legumes and low-fat dairy foods. CBS News states that processed flour, sugar and beverages that affect the nervous system such as alcohol or caffeine can cause mood swings.