Jeanette Jeni Johnstone

Jeanette (Jeni) Johnstone is an Associate Professor of Psychiatry in the Division of Clinical Psychology at Oregon Health & Science University, where she also practices as a clinical psychologist and marriage and family therapist. Her research centers on nutritional psychiatry, specifically examining the role of micronutrient supplementation in pediatric mental health. She leads the MADDY randomized controlled trial, investigating how multinutrients influence inflammatory biomarkers, oxidative stress, kynurenine metabolism, and the gut microbiome in children with attention-deficit/hyperactivity disorder. Her recent publications also explore interoceptive accuracy in ADHD and trace mineral concentrations. She is a senior contributor to the International Society for Nutritional Psychiatry Research, advancing the field through translational research bridging clinical nutrition and child psychiatry.