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Chapter 6  of Biological Treatments for Autism and PDD by William Shaw (ISBN
0-9661238-0-8) is titled "Abnormalities of the digestive system" and includes
a readable discussion and cites research studies.  Actually you would find the
entire book interesting.   If you can't find it in your area, it is available
from Great Plains Laboratory   9335 W. 75 Street         Overland Park,
KS.66204.   Cost---$19.95  plus $4.00 shipping

I have no financial interest in this book.
Dona Vickrey in TN