Link between gluten intake and B12 deficiency?

From http://www.nzine.co.nz/views/gluten.html

"Gluten is also associated with mental disorders. Prof Klaus Lorenz wrote extensively on the subject in Cereals and Schizophrenia, 1990. Dr Chris Reading, an orthomolecular psychiatrist practising in Sydney, advises its avoidance to all his patients with mental disorders. He firmly believes that gluten can damage the stomach cells which produce Intrinsic Factor necessary for vitamin B12 uptake. Over time, it can thus create vitamin B12 deficiency with its accompanying neurological disturbances. Dr Reading therefore also prescribes B12 injections for these patients."