Serum vitamin B12 concentration is associated with improved memory in older individuals with higher adherence to the Mediterranean diet.

Clin Nutr

Institut de Nutrició i Seguretat Alimentària (INSA), Universitat de Barcelona (UB), 08921 Santa Coloma de Gramanet, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029 Madrid, Spain; Department of Internal Medicine, Hospital Clinic, Institut d'Investigació Biomèdica August Pi i Sunyer (IDIBAPS), University of Barcelona, 08036 Barcelona, Spain. Electronic address:

Published: December 2023

AI Article Synopsis

  • Vitamin B is linked to cognitive performance, but its effectiveness may depend on the presence of other nutrients like folate and adherence to the Mediterranean diet.
  • A study involving 170 older participants showed a strong correlation between serum vitamin B levels and memory function among those with high adherence to the Mediterranean diet, while the link was weaker for those with lower adherence.
  • High adherence to the Mediterranean diet was associated with increased serum folate levels, indicating that dietary patterns influence cognitive function beyond just vitamin B intake.

Article Abstract

Background & Aims: Vitamin B plays a crucial role in cognition, but its effect might be regulated by the presence of other micronutrients, such as folate. The aim was to evaluate the effects of vitamin B on cognitive performance according to adherence to the Mediterranean diet, and whether the Mediterranean diet also results in increased folate or vitamin B12 levels.

Methods: This is a cohort study nested in a randomized controlled clinical trial performed in Hospital Clinic in Barcelona, Spain. A total of 170 participants of the PREDIMED trial (Barcelona - Hospital Clinic site) aged 55-80 years at high cardiovascular risk were included. Adherence to the Mediterranean diet was assessed using a validated 14-item questionnaire, memory function was evaluated with a battery of neuropsychological tests and serum vitamin B and folate were determined using an automated electrochemiluminiscence immunoassay system.

Results: In the multivariable adjusted linear regression model, serum vitamin B concentration presented a significant correlation with memory function (r = 0.57; P = 0.028) in participants with high adherence to the Mediterranean diet whereas the correlation was weak and inverse for those who presented a low adherence to the Mediterranean diet (r = 0.37, P = 0.731). Mediterranean diet adherence showed a positive association with serum folate, but not with serum vitamin B.

Conclusions: In an older Mediterranean population at high cardiovascular risk, changes in serum vitamin B correlate with better memory function only in the context of a high adherence to the Mediterranean pattern, suggesting that the effects of vitamin B goes further than a mere nutritional requirement.

Institutional Review Board Statement: The study was conducted according to the guidelines of the Declaration of Helsinki and was approved by the Institutional Review Board of the 11 participating centres. The study was registered with the International Standard Randomized Controlled Trial Number (ISRCTN) 35739639 (https://www.isrctn.com/ISRCTN35739639).

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http://dx.doi.org/10.1016/j.clnu.2023.10.025DOI Listing

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