Autistic children accumulate metals at a much higher level than children who do not have a diagnosis of autism.
Assessment of hair aluminum, lead, and mercury in a sample of autistic Egyptian children: Environmental risk factors of heavy metals in autism
El Baz Mohamed F, Zaky EA, Bassuoni EI-Sayed A, et al. Behavioural Neurology. 2015, Article ID 545674.
Researchers found the mean levels of mercury, lead and aluminum in hair of autistic patients were significantly higher than in controls. Mercury, lead and aluminum levels were positively correlated with maternal fish consumption, living near gasoline stations and the usage of aluminum pans, respectively.