Abstract Background: Psychological stress has a complex relationship across the lifespan with health behaviors such as dietary intake and with rate of biological aging. These relationships may help explain some of the important health disparities experienced by minoritized populations, specifically Black women. Few studies have had the longitudinal data to better understand the independent and additive roles of childhood and adulthood stress on biological aging. Research program. As part of this diversity supplement, I will gain invaluable training in aging research, focusing on understanding lifespan stress pathways of how stress and health behaviors contribute to health disparities. I will utilize new data from the National Growth and Health study. This is a biracial cohort of Black and white girls followed from age 10 to 20, and then recontacted 20 years later in midlife. I will examine measures of adult and child stress exposures, as predictors of both dietary intake, and secondarily, epigenetic aging. We collected reliable dietary intake data across several timepoints, and have developed established and innovative diet quality indices for both child and adult diet quality. In adulthood, we collected DNA for epigenetic clocks. I will use a mixed effects model for longitudinal analyses, and multiple regressions to test the cross-sectional outcomes. I will investigate the varying extent to which childhood stress, adult stress, and cumulative lifespan stress predict adult outcomes (dietary intake, epigenetic aging). I will also test race as a moderator for these relationships, and test within racial group relationships. This study will bring new valuable findings to the small existing literature on the relationships between stress, diet, and aging, and may help identify periods in the lifespan for the most effective health interventions. This ten-month fellowship will help me develop new expertise as a researcher in understanding longitudinal models of aging, and how diet and epigenetic aging may play a role in racial health disparities.