Introducción: el sobrepeso y la obesidad en la infancia y la adolescencia se han incrementado progresivamente durante los últimos años. Además de las comorbilidades conocidas, la obesidad se ha relacionado con un bajo rendimiento escolar en todas las edades, asociándose a alteraciones cognitivas. Objetivo: determinar la diferencia que existe en la función cognitiva de unos niños de 8 a 12 años con normopeso, sobrepeso u obesidad. Material y métodos: se realizó un estudio observacional y transversal en 46 niños de 8 a 12 años. Los niños se clasificaron en 3 grupos: normopeso, sobrepeso y obesidad. Posteriormente se realizaron pruebas de función cognitiva. Resultados: la mayoría de los niños con obesidad presentaron deterioro cognitivo (63 %; p = 0.02)), con mayor grado de deterioro en comparación con el observado en los demás grupos (80 %; p < 0.05). Por otro lado se observó que los niños con sobrepeso aún tienen posibilidad de evitar el desarrollo del padecimiento si corrigen sus hábitos, ya que los resultados de este grupo fueron similares a los del grupo con normopeso. Conclusiones: encontramos un incremento significativo no solo del déficit cognitivo sino también del grado de severidad de este en los niños obesos en comparación con aquellos con sobrepeso o normopeso.
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