Regardless of each child's nutritional status at the beginning of the study, the intervention improved metabolic parameters; the IG showed a negative effect on glucose concentrations (–1.83; CI 95% –3.06 to -0.60), low-density lipoprotein-cholesterol (–2.59; CI 95% –5.12 to –0.06), insulin (–0.84; CI 95% –1.31 to –0.37), and homeostasis model to assess the insulin resistance index (HOMA-IR; –0.21; CI 95% –0.32 to –0.09) in comparison to the CG. This evidence concerns the gene INS and Insulin resistance.