Inclusion Criteria:

• * 18-70 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