Unrelated: Deficiency of B12 can cause dementia, but Lewy Body Dementia is a separate disorder. See this site for info on Lewy Body Dementia. http://www.mayoclinic.org/diseases-conditions/lewy-body-dementia/basics/definition/CON-20025038
Answered 7/29/2015
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Lewy body dementia: The etiology for Lewy body dementia is largely unknown, but it is not believed to be related to vitamin B12 deficiency that can cause otherwise significant neurological symptoms mimicking dementia. An overlap is always possible and vitamin B 12 deficiency should be corrected promptly. So far, there is no known cure for Lewy body dementia, treatment being mostly symptom directed.
Answered 9/19/2019
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