Neurologist and author, David Perlmutter, claims that gluten causes Alzheimer's. Can someone provide journal references on research that proves this?

Fully disagree. There is NO solid evidence anywhere that gluten causes Alzheimer's disease, and there is NO relationship with Celiac disease and dementia, but Celiac disease does cause a Peripheral Small Fibre Neuropathy. We have some anecdotal cases of gluten sensitivity affecting MS indirectly, and maybe transient worsening of other conditions, but no Alzheimer's links.