The purpose of this study is to determine the feasibility, measured by compliance to a low-GI diet, of a 6-month low glycemic dietary intervention in children and adolescents undergoing treatment for ALL. Are you Eligible? (Inclusion Criteria) (1) Children and adolescents diagnosed with ALL between the age of 5-21 years of age, (2) Within three days of starting the induction phase of therapy for ALL (B- Cell, T-Cell, or Mixed Phenotype), and (3) Proficient in English or Spanish.