This database contains 8 studies, archived under the term: "vitamin b 12"
A proteomics study reveals a predominant change in MaoB expression in platelets of healthy volunteers after high protein meat diet: relationship to the methylation cycle
Zellner, Maria,
Babeluk, Rita,
Jakobsen, Lene H.,
Gerner, Christopher,
Umlauf, Ellen,
Volf, Ivo,
Roth, Erich,
Kondrup, Jens
Studies investigating the impact of high meat intake on cognition have yielded contradictory results as some show improved cognitive performance, whereas others report an increase of risk factors for dementia. However, few studies were designed to directly assess the effect of a high protein (HP) diet on both cognitive performance and corresponding biochemical parameters. A […]
Effect of B vitamins and lowering homocysteine on cognitive impairment in patients with previous stroke or transient ischemic attack: a prespecified secondary analysis of a randomized, placebo-controlled trial and meta-analysis
Hankey, Graeme J.,
Ford, Andrew H.,
Yi, Qilong,
Eikelboom, John W.,
Lees, Kennedy R.,
Chen, Christopher,
Xavier, Denis,
Navarro, Jose C.,
Ranawaka, Udaya K.,
Uddin, Wasim,
Ricci, Stefano,
Gommans, John,
Schmidt, Reinhold,
Almeida, Osvaldo P.,
van Bockxmeer, Frank M.
Background and Purpose: High plasma total homocysteine (tHcy) has been associated with cognitive impairment but lowering tHcy with B-vitamins has produced equivocal results. We aimed to determine whether B-vitamin supplementation would reduce tHcy and the incidence of new cognitive impairment among individuals with stroke or transient ischemic attack≥6 months previously.; Methods: A total of 8164 […]
Comparisons of plasma/serum micronutrients between Okinawan and Oregonian elders: a pilot study
Dodge, Hiroko H.,
Katsumata, Yuriko,
Todoriki, Hidemi,
Yasura, Shoutoku,
Willcox, D. Craig,
Bowman, Gene L.,
Willcox, Bradley,
Leonard, Scott,
Clemons, Aaron,
Oken, Barry S.,
Kaye, Jeffrey A.,
Traber, Maret G.
Certain micronutrients are protective against cognitive decline. We examined whether there is any uniform pattern of circulating micronutrients cross-culturally that are associated with successful cognitive aging. For the U.S. sample, we used the stored serum/plasma of 115 participants, collected in Oregon, USA. The Okinawa sample consisted of 49 participants selected using similar inclusion criteria as […]
Effect of an antioxidant drink on homocysteine levels in Alzheimer’s patients
Morillas-Ruiz, J. M.,
Rubio-Perez, J. M.,
Albaladejo, M. D.,
Zafrilla, P.,
Parra, S.,
Vidal-Guevara, M. L.
Background: A large body of evidence supports a role of oxidative stress in Alzheimer disease (AD) and in cerebrovascular disease. Blood levels of homocysteine may be increased in AD and hyperhomocysteinemia may contribute to disease pathophysiology by vascular and direct neurotoxic mechanisms. Even in the absence of vitamin deficiency, plasma total homocysteine (tHcy) concentration may […]
A randomized placebo controlled trial of homocysteine lowering to reduce cognitive decline in older demented people
Kwok, T.,
Lee, J.,
Law, C. B.,
Pan, P. C.,
Yung, C. Y.,
Choi, K. C.,
Lam, L. C.
Introduction: Whether homocysteine lowering by B vitamins can reduce cognitive decline in Alzheimer disease and vascular dementia patients is unclear.; Methods and Materials: 140 subjects with mild to moderate Alzheimer disease or vascular dementia were randomly assigned to take 1 mg of methylcobalamin and 5 mg of folic acid, or placebo once daily for 24 […]
Vitamins B(12), B(6), and folic acid for cognition in older men
Ford, A. H.,
Flicker, L.,
Alfonso, H.,
Thomas, J.,
Clarnette, R.,
Martins, R.,
Almeida, O. P.
Objective: To investigate whether supplementing older men with vitamins B(12), B(6), and folic acid improves cognitive function.; Methods: The investigators recruited 299 community-representative hypertensive men 75 years and older to a randomized, double-blind controlled clinical trial of folic acid, vitamin B(6), and B(12) supplementation vs placebo over 2 years. The primary outcome of interest was […]
Plasma free choline, betaine and cognitive performance: the Hordaland Health Study
Nurk, Eha,
Refsum, Helga,
Bjelland, Ingvar,
Drevon, Christian A.,
Tell, Grethe S.,
Ueland, Per M.,
Vollset, Stein E.,
Engedal, Knut,
Nygaard, Harald A.,
Smith, David A.
Choline and betaine are nutrients involved in one-carbon metabolism. Choline is essential for neurodevelopment and brain function. We studied the associations between cognitive function and plasma concentrations of free choline and betaine. In a cross-sectional study, 2195 subjects (55 % women), aged 70-74 years, underwent extensive cognitive testing including the Kendrick Object Learning Test (KOLT), […]