Toxic Metals and Autism

Toxicological Status of Children with Autism vs. Neurotypical Children and the Association with Autism Severity.

Arizona State University


This study investigates both the level of toxic metals in children with autism and the possible association of those toxic metals with autism severity.

This study involved 55 children with autism ages 5-16 years compared to 44 controls with similar age and gender.

The study included measurements of toxic metals in whole blood, red blood cells (RBC), and urine.

The autism group had higher levels of lead in RBC (+41 %, p = 0.002) and higher urinary levels of lead (+74 %, p = 0.02), thallium (+77 %, p = 0.0001), tin (+115 %, p = 0.01), and tungsten (+44 %, p = 0.00005).

However, the autism group had slightly lower levels of cadmium in whole blood (-19 %, p = 0.003).

A stepwise, multiple linear regression analysis found a strong association of levels of toxic metals with variation in the degree of severity of autism for all the severity scales (adjusted R (2) of 0.38-0.47, p < 0.0003). Cadmium (whole blood) and mercury (whole blood and RBC) were the most consistently significant variables.

Overall, children with autism have higher average levels of several toxic metals, and levels of several toxic metals are strongly associated with variations in the severity of autism for all three of the autism severity scales investigated.

This entry was posted in Autism, Environment, Physiology and tagged , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s