Why So Many Intolerant to Gluten?

Two articles on theories as to why so many people are Celiacs/Gluten Intolerant. A friend at my husband's job told him about Sears and his research, the second article/paper.

Also more info in the first article on research linking brain function/issues to gluten consumption in affected individuals.

http://www.celiac.com/articles/76/1/Why-So-Many-Intolerant-To-Gluten----by-Luigi-Greco-DCH-MScMCH-MD-Department-of-Pediatrics-University-of-Naples-06301995/Page1.html

http://www.nap.edu/html/biomems/esears.pdf