| | Summary# 35993
Keywords:
AGING, COGNITIVE FUNCTION - Vitamin B12, MMSE, CAMCOG, Methylmalonic Acid,
MMA
Topic:
Inverse Association between Serum Methylmalonic Acid Levels and Cognitive Function in the
Elderly
Reference:
"Methylmalonic acid and cognitive function in the Medical Research Council Cognitive Function
and Ageing Study," McCracken C, Hudson P, et al, Am J Clin Nutr, 2006; 84(6): 1406-11.
(Address: University Department of Psychiatry, Royal Liverpool University Hospital, Liverpool,
United Kingdom).
Summary:
In a cross-sectional study involving 84 nondemented participants (over 69 years of age) from the Welsh
cohort of the Medical Research Council's Cognitive Function and Aging Study, likely metabolically
significant vitamin B12 deficiency - indicated by elevated serum levels of methylmalonic acid (MMA; a
related metabolic marker of vitamin B12 deficiency) - was associated with lower cognitive scores of
language comprehension and expression. Additionally, a high prevalence of likely metabolically significant
vitamin B12 deficiency was observed in the elderly participants. Cognitive status was assessed by the
Mini-Mental State Examination (MMSE) and the Cognitive Section of the Cambridge Mental Disorders
of the Elderly Examination (CAMCOG). Likely metabolically significant vitamin B12 deficiency was
observed in 43% of the participants. After adjusting for age and education, higher MMA levels were
associated with lower MMSE scores. Additionally, an inverse association was foun d between serum
MMA levels with CAMCOG scores of ideational praxis, language comprehension, and language
expression. Furthermore, a weak but significant correlation was observed between serum folate with
language, remote memory, and constructional and ideational praxis scores. Thus, the authors of this
study conclude, "The high prevalence of likely metabolically significant vitamin B-12 deficiency in the
elderly is associated with lower cognitive function scores and particularly with lower scores of language
comprehension and expression."
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