Self-reported chocolate intake? There are so many possible confounders here. It seens quite implausible that chocolate can acutely enhance cognitive ability. Alternative explanations are more likely, although not newsworthy.
I also think that nutrition science, which is deficient enough as it is, should not be mixed with epidemiology, which seems designed to detect spurious associations.
I also think that nutrition science, which is deficient enough as it is, should not be mixed with epidemiology, which seems designed to detect spurious associations.