Toxic metals may influence autism severity.
"Children with higher levels of metals such as lead and antimony in their urine had more severe autism, suggesting that metal levels in their bodies may contribute to its seriousness. The severity of a child's autism coincided with the levels of toxic metals excreted in their urine after treatment with a metals removal therapy, finds a study published in the Journal of Toxicology. The higher the levels of lead, antimony and other metals excreted, the more severe was the child's autism. The findings hold true across four independent tools used to assess autism severity."