A predominantly processed food diet at the age of three is directly associated with a lower IQ at the age of eight and a half, compared to children who eat a diet rich in fresh fruit and vegetables, according to an Avon Longitudinal Study of Parents and Children (ALSPAC), which is tracking the health of around 14,000 children.
The scientists who carried out the study emphasized however that they could not say for certain that processed foods are the cause of lower IQs as other factors such as social class and educational upbringing may be implicated.
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