The purpose of this study was to investigate the perceptions of youth with diabetes mellitus (DM) and their parents/guardians about issues related to eating habits and to identify the relationships between treatment and lifestyle/daily care factors, youth characteristics, and eating habits of youth with DM. Methods included medical chart review and a written survey for youth with DM (n = 125) aged 10 to 20 years and their parents/guardians (n = 125) at Miller Children's Hospital in Long Beach, California. Healthier eating was associated with stronger parent-youth relationships (P = .000), eating meals at home (P = .047), parent/guardian involvement in DM management (P = .039), younger age of youth (P = .008), and youth being male (P = .017) but not with treatment duration, special meetings with a registered dietitian, parent/guardian age, BMI z score, race/ethnicity, or language of youth. This study suggests that family-centered interventions for youth with DM should promote strong parent-youth relationships, eating at home, parent involvement in DM management for younger patients with special attention to transition to self-care among older patients, and healthy food choices for older youth with DM, especially girls.