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Los autores de este estudio cooperativo siguieron durante 9.6 años a 61.423 pacientes de quienes se conocían sus hábitos alimentarios.
Comprobaron que existe una relación inversamente proporcional entre el consumo de frutas y verduras y el desarrollo del cáncer colorrectal. En aquellos que consumían menos de 1 ½ porción de dichos alimentos por día, el riesgo fue 1.65 veces mayor que en aquellos que consumían 2 ½ porciones diarias.
El efecto beneficioso fue proporcionalmente mayor con el consumo de frutas que de verduras y no se pudo detectar un efecto beneficioso en el consumo de fibras, sean de cereal o no.