Toggle Health Problems and D

Dementia is associated with low vitamin D - many studies

Vitamin D reduced Dementia in VA by 40% - Dr. Campbell March 2023

YouTube 18 minutes
reporting on Vitamin D supplementation and incident dementia: Effects of sex, APOE, and baseline cognitive status
which is in VitaminDWiki Dementia again associated with low Vitamin D – 15th study in 10 years – Jan 2023

57+ Vitamin D pages containing "Dementia" in title

VitaminDWiki - Overview Alzheimer's-Cognition and Vitamin D

has the following summary

VitaminDWiki - Super-Agers also have better cognition - April 2024 perhaps due to better Blood-Brain-Barrier

Dementia 1.8X more likely if low Vitamin D - April 2022

Vitamin D and brain health: an observational and Mendelian randomization study
Am J Clin Nutr . 2022 Apr 22;nqac107. doi: 10.1093/ajcn/nqac107.
 Download the PDF from VitaminDWiki

Vitamin D deficiency as a risk factor for dementia: a systematic review and meta-analysis - 2017

BMC Geriatrics volume 17, Article number: 16 (2017)
Isolde Sommer, Ursula Griebler, Christina Kien, Stefanie Auer, Irma Klerings, Renate Hammer, Peter Holzer & Gerald Gartlehner
 Download the PDF from VitaminDWiki

Sunlight exposure and high vitamin D status have been hypothesised to reduce the risk of developing dementia. The objective of our research was to determine whether lack of sunlight and hypovitaminosis D over time are associated with dementia.

We systematically searched MEDLINE (via PubMed), Cochrane Library, EMBASE, SCOPUS, Web of Science, ICONDA, and reference lists of pertinent review articles from 1990 to October 2015. We conducted random effects meta-analyses of published and unpublished data to evaluate the influence of sunlight exposure or vitamin D as a surrogate marker on dementia risk.

We could not identify a single study investigating the association between sunlight exposure and dementia risk. Six cohort studies provided data on the effect of serum vitamin D concentration on dementia risk. A meta-analysis of five studies showed a higher risk for persons with serious vitamin D deficiency (<25 nmol/L or 7–28 nmol/L) compared to persons with sufficient vitamin D supply (≥50 nmol/L or 54–159 nmol/L) (point estimate 1.54; 95% CI 1.19–1.99, I2 = 20%). The strength of evidence that serious vitamin D deficiency increases the risk of developing dementia, however, is very low due to the observational nature of included studies and their lack of adjustment for residual or important confounders (e.g. ApoE ε4 genotype), as well as the indirect relationship between Vitamin D concentrations as a surrogate for sunlight exposure and dementia risk.

The results of this systematic review show that low vitamin D levels might contribute to the development of dementia. Further research examining the direct and indirect relationship between sunlight exposure and dementia risk is needed. Such research should involve large-scale cohort studies with homogeneous and repeated assessment of vitamin D concentrations or sunlight exposure and dementia outcomes.

Quality assessment of systematic reviews of vitamin D, cognition and dementia - 2018

BJPsych Open. 2018 Jul;4(4):238-249. doi: 10.1192/bjo.2018.32.
Aghajafari F1, Pond D2, Catzikiris N3, Cameron I4.

  • 1 Assistant Professor, Dept of Family Medicine, Cumming School of Medicine, U. of Calgary Sunridge Family Medicine Teaching Centre, Canada.
  • 2 Professor and Head of Department of Family Medicine, University of Newcastle, Australia.
  • 3 Research Assistant, School of Medicine and Public Health, Faculty of Medicine, The University of Newcastle, Australia.
  • 4 Professor, Northern Clinical School, Rehabilitation Studies Unit, Sydney Medical School, The University of Sydney, Australia.

BACKGROUND: There is conflicting evidence regarding the association of vitamin D with cognition performance and dementia.

Aims We aimed to summarise the evidence on the association of vitamin D with cognitive performance, dementia and Alzheimer disease through a qualitative assessment of available systematic reviews and meta-analyses.

METHOD: We conducted an overview of the systematic reviews of all study types with or without meta-analyses on vitamin D and either Alzheimer disease, dementia or cognitive performance up to June 2017.

Eleven systematic reviews were identified, nine of which were meta-analyses with substantial heterogeneity, differing statistical methods, variable methodological quality and quality of data abstraction. A Measurement Tool to Assess Systematic Reviews checklist scores ranged from 4 to 10 out of 11, with seven reviews of 'moderate' and four of 'high' methodological quality.
Out of six meta-analyses on the association between low serum concentration of 25-hydroxyvitamin D and risk of dementia, five showed a positive association. Results of meta-analyses on the association between low serum concentration of 25-hydroxyvitamin D and memory function tests showed conflicting results.

This systematic evaluation of available systematic reviews provided a clearer understanding of the potential link between low serum vitamin D concentrations and dementia. This evaluation also showed that the quality of the available evidence is not optimal because of both the low methodological quality of the reviews and low quality of the original studies. Interpretation of these systematic reviews should therefore be made with care.


J Prev Alz Dis 2016;3(1):43-52 http://dx.doi.org/10.14283/jpad.2015.68 full text and graphics at the website
T.J. Littlejohns1,2, K. Kos2, W.E. Henley2, E. Kuźma2, D.J. Llewellyn 2 llewellyn at exeter.ac.uk
1. Clinical Trials Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK;
2. University of Exeter Medical School, University of Exeter, Exeter, UK

Emerging evidence suggests that low vitamin D concentrations are potentially involved in the pathogenesis of dementia. This is of particular interest when considering the high prevalence of vitamin D deficiency in elderly adults and the urgent need to identify modifiable risk factors for dementia. Studies have found that vitamin D is implicated in procognitive and neuroprotective functions, including the reduction of Alzheimer’s disease hallmarks such as amyloid beta and phosphorylated tau. Cross-sectional studies have consistently found that vitamin D concentrations are significantly lower in individuals with Alzheimer’s disease and cognitive impairment compared to healthy controls. Longitudinal studies support an association between low vitamin D concentrations and an increased risk of dementia and cognitive decline. Neuroimaging studies are beginning to uncover the potential neurodegenerative and cerebrovascular mechanisms that underlie these associations such as white matter hyperintensities and enlarged ventricular volume, although there is currently a lack of longitudinal studies. In contrast to observational studies, findings from interventional studies have produced mixed results on the benefits of vitamin D supplementation on dementia and cognitive outcomes. Interpretation of the findings from these studies is hampered by several major methodological limitations, such as small sample sizes, inadequate doses and inclusion of participants unlikely to benefit from vitamin D supplementation. There is a need for large double-blind randomised-control trials investigating whether vitamin D supplementation can halt or delay the risk of dementia-related outcomes in individuals with low vitamin D concentrations.

How to Communicate With People Suffering From Dementia - April 2022 - nothing about Vitamin D

Wall Street Journal   PDF

  • "Anne Basting says the key is to not ask questions that force those with Alzheimer’s to remember facts. Instead, focus on creative and emotional communication."

Dementia is also associated with Magnesium

Note: increased Magnesium increases the vitamin D in the blood and cells, e.g. brain cells

  • People getting 550 mg ( vs 330 mg) of magnesium in diet had brains which were 1 year younger at age 55 MDEdge April 2023   study
  • Low Serum Magnesium is Associated with Incident Dementia in the ARIC-NCS Cohort - Oct 2020 1.2X PDF
  • Serum magnesium is associated with the risk of dementia - 2017 BOTH high and low Mg PDF via Sci-Hub
  • Association between magnesium intake and cognition in US older adults: National Health and Nutrition Examination Survey (NHANES) 2011 to 2014 - Feb 2022 PDF

Dementia risk increased 1.5X to 1.9X: depends on type of laxative used - Feb 2023

Regular laxative use tied to increased dementia risk MDEdge

32,000 hits for the search: dementia (latitude OR sunshine)

Google Scholar Feb 2024

There have been 97222 visits to this page

Dementia is associated with low vitamin D - many studies        
93366 visitors, last modified 21 May, 2024,
(Cached) Printer Friendly Follow this page for updates

Attached files

ID Name Comment Uploaded Size Downloads
17881 magnesium intake and cognition in US.pdf admin 15 Jun, 2022 602.55 Kb 331
17880 Incident Dementia.pdf admin 15 Jun, 2022 352.39 Kb 274
17879 Dementia Mg Sci-Hub.pdf admin 15 Jun, 2022 387.68 Kb 400
17483 How to Communicate With People Suffering From Dementia - WSJ.pdf admin 23 Apr, 2022 209.15 Kb 291
17475 Brain health.pdf admin 22 Apr, 2022 924.95 Kb 306
14234 Dementia Meta 2017.pdf admin 01 Sep, 2020 526.15 Kb 616