PCB's have been linked to lower I.Q.'s in children.
In addition, phosphoric acid, an ingredient in all colas, has been linked to lower bone density.
In utero pesticide exposure has been linked to lower IQs in infants.
Lead paint has been linked to lower I.Q., retardation, learning difficulties, behavioral problems, stunted growth and hearing loss.
Besides that, it has been linked to lower cognitive function, and a rise in mental illness and asthma in children.
XPD polymorphism and decreased expression of XP genes have both been linked to lower DNA repair capacity.
While increasing the number of primary care physicians has been linked to lower mortality rates, increasing the supply of specialists has not.
Fatty fish are abundant sources of omega-3 fatty acids, healthy unsaturated fats that have been linked to lower blood levels of beta-amyloid the protein that forms damaging clumps in the beta-amyloid the with Alzheimer's disease.
The treadmill desk has also been linked to lower cognitive performance, although it is somewhat miraculous that anyone is able to use a treadmill desk without being able to think about anything other than how insufferable they are.
But a study this year found that lead exposure in nearly 60,000 children in Chicago had been linked to lower, or failing, reading and math scores in the Chicago Public Schools.
