I am DAN (Defeat Autism Now) trained and have seen fantastic progress made when the naturopathic approach is used to help design a treatment protocol. There is no doubt that a large portion of autistic individuals have severe gastrointestinal issues (including food allergies, absorption issues, and permeability problems) as well as a general problem detoxifying. This means that even small amounts of environmental stresses like heavy metals, pesticides, and plastics that the average person can detox are not excreted from the body.
In addition, a program developed by the DAN group is turning out to be a big help in determining what treatments have the highest likelihood of being successful.