Can a weak wrist (and arm) be an early sign of early onset dementia?

Can a weak wrist (and arm) be an early sign of early onset dementia? by Connie b. Dellobuono

Answer by Connie b. Dellobuono:

Nerve pain and weak wrist can be alleviated by magnesium and Vitamin B12 (complex). Lack of B12 is often seen in Parkinsons. Diabetes is prevalent in Dementia, which creates nerve pain as endpoint.

Can a weak wrist (and arm) be an early sign of early onset dementia?