Intelligence is a whole brain phenomenon

Recent studies demonstrated that the relationship between brain structure and intelligence not only involves grey matter, but also white matter - the brain's wiring system. 

Lead exposure in childhood linked to lower IQ as adults

A long-term study of 565 children who grew up in the era of leaded gasoline has shown that their exposure to the powerful neurotoxin led to a loss of intelligence and occupational standing by the time they reached age 38.

Processed food diet in early childhood may lower subsequent IQ

A diet, high in fats, sugars and processed foods in early childhood may lower IQ, while a diet packed full of vitamins and nutrients may do the opposite, suggests new research.