To examine family mealtime interactions, parental concerns about nutrition, and body mass index (BMI) among children with cancer who did not have primary central nervous system involvement. Parents of 95 children receiving treatment for cancer and 95 comparisons completed the About Your Child's Eating-Revised (AYCE-R) measure. Anthropometric data for children with cancer were obtained from medical charts at diagnosis and again when the AYCE-R was administered. No differences in mealtime interactions were found between children with cancer and comparisons, but parents of children with cancer reported greater concern about their child's weight. Anthropometric measures for children with cancer were consistent with national norms. However, children with cancer were somewhat underweight at diagnosis and became heavier over time. Lower BMI was associated with mother and father report of greater resistance from the child at mealtime, father report of his own aversion to family meals, and more severe treatment. The impact of cancer on family mealtime interactions and BMI appeared minimal during treatment. However, further longitudinal research is needed given the risk for late effects, such as growth problems and obesity, among cancer survivors. Families also may benefit from ongoing education to optimize healthy lifestyles among survivors.