Background: Late adolescence is considered a risk stage for psychological health. The objective of this research was evaluating the association among risk eating behaviors (REB), parental practices and assertive behavior in high school students according to sex. Method: With a non-experimental design and transversal study participated 200 students (104 men and 96 women) from a public high school with age mean of 16.52 (SD = 1.05 years), who after signing informed consent fulfilled the Eating Attitudes Test-26 (EAT), the Scale of Parental Practices for Adolescents (PP-A) which has nine subscales, four towards the father (PPf) and five towards the mother (PPm) and the Assertive Behavior Scale (CABS), all of them validated for Mexican population. Results: Differential associations were found according to sex: in women, EAT-26-Total was associated with CABS-Tota...