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Objective: Obesity and substance use are leading preventable causes of mortality, yet their origins in violence remain poorly understood. This study examined child maltreatment in relation to obesity and symptoms consistent with substance use disorder (SUD) in late adolescence, determining the roles of the child maltreatment type and timing, and gender. Method: The sample (N = 1,161) was drawn from the Longitudinal Studies of Child Abuse and Neglect. Obesity and SUD were measured at 18 years. Lifetime child protective services records and youth self-reports indicated physical abuse, sexual abuse, supervisory neglect, failure-to-provide neglect, and emotional maltreatment during early childhood, middle childhood, and adolescence. Results: In the overall sample, emotional maltreatment during adolescence was associated with obesity (OR = 2.03, 95% CI [1.25, 3.30]) and SUD (OR = 2.00, 95% CI [1.20, 3.35]), and adolescent physical abuse with obesity (OR = 2.20, 95% CI [1.36, 3.58]). In girls, early childhood physical abuse was associated with SUD (OR = 2.35, 95% CI [1.08, 5.12]), and emotional maltreatment during adolescence with obesity (OR = 2.16, 95% CI [1.10, 4.23]) and SUD (OR = 3.21, 95% CI [1.37, 7.3 5]). Adolescent physical abuse and obesity were associated in boys (OR = 3.18, 95% CI [1.45, 6.98]). Gender moderation was identified for an inverse relationship between supervisory neglect and obesity in girls (OR =.26, 95% CI [.07,.99]). Conclusions: Type and timing contribute to the effects of child maltreatment, contingent upon gender. Intervention focused on adolescent emotional maltreatment may reduce both SUD and obesity. [ABSTRACT FROM AUTHOR]