Diet and Depression

Inclusion Criteria: * 18-80 year olds (inclusive), all race/ethnic groups * Willing to not change psychotropic medication or psychotherapy regimen during the study * Willing and able to come to UCSF for in person visits two times * Ability to speak and read English and answer participant surveys Exclusion Criteria: * Psychiatric hospitalization in past 3 months * Active suicidal ideation with intent and plan or scoring a 3 or higher on the Columbia suicide severity rating scale (C-SSRS) * In a current severe mood state when entering the study that would prohibit compliance with study visits or dietary program * Known GI abnormalities or known GI medical problems (diarrhea, chronic intestinal disease, toxic megacolon, ileum) or known swallowing or chewing disorders or issues * Anticipating or planning any major changes in physical activity or sleep during the study * Pregnant or planning to be pregnant during the study * Breastfeeding or planning to breastfeed during the study