Heavy metals like mercury, lead, tungsten, tin and cadmium have long been known to be toxic, causing severe health problems and even death in high enough doses. A new study, however, has implicated these metals in contributing to autism.
The Arizona State University study looked at the blood and urine of 55 children with autism and compared it to samples from 44 unaffected children of similar ages. They found a significantly higher level of toxic metals in samples from the autistic children.
Of those in the autistic group, 41 percent more lead was found in red blood cells. Urinary levels of lead were 71 percent higher, as well as 77 percent more thallium, 115 percent more tin and 44 percent more tungsten.