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This seems to have many implications for celiac disease and its
manifestations, particularly related to the brain, including the recent
discussions on schizophrenia:

In his May 2001newsletter, Dr. Andrew Weil discusses a book called: The
Second Brain: A Groundbreaking New Understanding of Nervous Disorders of
the Stomach and Intestine" (c1999) by Dr. Michael Gershon (chairman of the
Dept. of Anatomy & Cell Biology at Columbia Univ. Coll. of Physicians and
Surgeons at Columbia-Presbyterian Medical Cts. in NYC).

Quotes from the newsletter: "In the 1960s, Dr. Gershon challenged
conventional thinking by suggesting that serotonin was an important
neurotransmitter not only the the brain, but in the gut (intestines) as
well. Since then, additional research has confirmed that many other
chemicals crucial to the brain are at work in the bowel, and the enteric
nervous system (ENS) functions as a sort of second brain.......All 30
classes of neurotransmitters found in the brain are produced in the
bowel, as well as 20 hormones and 70 to 80 percent of the body's immune
cells. Although we consider the brain the commander-in-chief of the
body, nine times more messages flow from the gut to the brain than from
the brain to the gut.......Conditions we think of as 'all in the head'
may actually have a physical basis in the gut."

Apparently, brain-cell markers for IBS and IBD, as well as Alzheimer's and
Parkinson's disease are found in nerve cells in the gut. "There's
speculation that the gut may play a role in autism as well: The high blood
levels of serotonin typically found in autistic children may signal that
cells in the bowel are releasing too much serotonin or failing to activate
serotonin properly."

I haven't read this book yet, but it's supposedly available for $14. Sounds
enlightening!