Fast-food consumption linked to lower test score gains in 8th graders

The amount of fast food children eat may be linked to how well they do in school, a new America-wide study suggests. This study can't say why fast-food consumption is linked to lower grades, but other studies have shown that fast food lacks certain nutrients, especially iron, that help cognitive development. In addition, diets high in fat and sugar -- similar to fast-food meals -- have been shown to hurt immediate memory and learning processes.

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