The empirical reports in this special issue of Health Psychology showcase the work of a diverse array of accomplished early-stage investigators who are members of the Adolescent Brain Cognitive Development (ABCD) study consortium and who are drawn from the community of female and underrepresented scientists. Their studies focus primarily on youth assessed during preadolescence and early adolescence, and they are based on the ABCD data that were available to the scientific community at the time this special issue was being prepared (e.g., baseline, Years 1 and 2 assessments). They address a variety of questions about adolescent health behavior, such as the effects of screen time and caffeine on sleep; individual lifestyle, neighborhood, and environmental factors associated with physical health conditions and brain development; and the antecedents and consequences of prenatal and adolescent substance exposure. (PsycInfo Database Record (c) 2023 APA, all rights reserved).