Had a look at an interesting article on http://www.dementiatoday.com
about celiac disease and dementia (a small study, but the people
involved had celiac disease and all had dementia not explained from
other causes - its well established that unmanaged celiac disease
causes neurological problems,but this is the first time they've
recognized that it may cause dementia).

In the US, the Mayo clinic says the actual incidence of celiac disease
is about 1 in 133 people. However, in the US the actual diagnosis rate
is 1 in 4,700 Americans - so its a health problem that often goes
unrecognized.

My MIL had a chronic gastrointestinal thing - we have long suspected
she may have actually had gluten problems.

Mary