What Doctors Say
Some doctors say (1) that an important part of therapy for autistic children, is to normalise levels of copper and zinc in the blood, which may be due to environmental factors. In one particular study (1), high levels of copper and low levels of zinc were shown to be a factor in autism. Indeed, the study went much further, saying that metallothionein (MT) dysfunction was the primary cause of autism, with high levels of copper and other heavy metals being a key factor.
What you may be asking yourself is. What is metallothionein?