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Do MCI patients with vitamin B12 deficiency have distinctive cognitive deficits?

Dina Silva1, Ulrike Albers, Isabel Santana

  • 1Dementia Clinics, Faculty of Medicine, University of Lisbon, Lisbon, Portugal. dinasilva@fm.ul.pt.

BMC Research Notes
|September 10, 2013
PubMed
Abstract

Insights

Vitamin B12 deficiency in Mild Cognitive Impairment (MCI) patients did not present a unique cognitive profile. However, deficiency may hasten symptom onset, with supplementation showing no immediate clinical benefit in this study.

Area of Science:

  • Neurology
  • Nutritional Neuroscience

Background:

  • Vitamin B12 deficiency is prevalent in older adults and linked to reversible dementia.
  • Low vitamin B12 levels are observed in patients diagnosed with Mild Cognitive Impairment (MCI).
  • The specific cognitive profile associated with vitamin B12 deficiency in MCI remains unclear.

Purpose of the Study:

  • To investigate if vitamin B12 deficiency in MCI patients is associated with a distinct cognitive impairment profile.
  • To compare cognitive symptoms and test results between MCI patients with and without vitamin B12 deficiency.

Main Methods:

  • A case-control study comparing 15 MCI patients with vitamin B12 deficiency to 45 MCI patients with normal vitamin B12 levels.
  • Analysis of subjective cognitive symptom duration and performance on neuropsychological tests.
  • Clinical observation following vitamin B12 supplementation in deficient MCI patients.

Main Results:

  • MCI patients with vitamin B12 deficiency reported significantly shorter durations of subjective cognitive symptoms (1.2 years) compared to those without deficiency (3.4 years).
  • No statistically significant differences were found in neuropsychological test performance between the two groups.
  • Vitamin B12 supplementation in deficient MCI patients did not yield noticeable clinical improvement.

Conclusions:

  • MCI patients with vitamin B12 deficiency do not exhibit a unique cognitive impairment profile.
  • Vitamin B12 deficiency may act as a precipitating factor for cognitive symptoms in MCI.
  • Further prospective studies are needed to clarify the impact of vitamin B12 supplementation in MCI patients with deficiency.

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