Evidence map›Paper›PMID 33546262›Full record

ReviewNutrients2021

Does the High Prevalence of Vitamin D Deficiency in African Americans Contribute to Health Disparities?

Bruce N Ames, William B Grant, Walter C Willett

Open access · goldAbstract readReview
In one paragraph

Review in Nutrients, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 77 papers, 8 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
77citing papers in PubMed, 8 pooled it
15.3field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

77 citing papers in PubMed, 8 syntheses or guidelines pooled it, 130 citations in OpenAlex.

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  9. Effect of Daily Vitamin D Supplementation on Risk of Upper Respiratory Infection in Older Adults: A Randomized Controlled Trial.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2024
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  17. Vitamin D, premature mortality, and life expectancy among US adults.Archives of public health = Archives belges de sante publique · 2025
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17 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 3 institutions in 1 country.

Bruce N AmesMolecular and Cell Biology, Emeritus, University of California, Berkeley, CA 94720, USA.
William B GrantSunlight, Nutrition and Health Research Center, San Francisco, CA 94164-1603, USA.ORCID 0000-0002-1439-3285
Walter C WillettDepartments of Nutrition and Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA.
Brigham and Women's Hospital · USSunlight Nutrition and Health Research Center · USUniversity of California, Berkeley · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

African Americans have higher incidence of, and mortality from, many health-related problems than European Americans. They also have a 15 to 20-fold higher prevalence of severe vitamin D deficiency. Here we summarize evidence that: (i) this health disparity is partly due to insufficient vitamin D production, caused by melanin in the skin blocking the UVB solar radiation necessary for its synthesis; (ii) the vitamin D insufficiency is exacerbated at high latitudes because of the combination of dark skin color with lower UVB radiation levels; and (iii) the health of individuals with dark skin can be markedly improved by correcting deficiency and achieving an optimal vitamin D status, as could be obtained by supplementation and/or fortification. Moderate-to-strong evidence exists that high 25-hydroxyvitamin D levels and/or vitamin D supplementation reduces risk for many adverse health outcomes including all-cause mortality rate, adverse pregnancy and birth outcomes, cancer, diabetes mellitus, Alzheimer's disease and dementia, multiple sclerosis, acute respiratory tract infections, COVID-19, asthma exacerbations, rickets, and osteomalacia. We suggest that people with low vitamin D status, which would include most people with dark skin living at high latitudes, along with their health care provider, consider taking vitamin D

Indexed as

Dietary SupplementsHealth Status DisparitiesAlzheimer DiseaseAntigens, NeoplasmBlack or African AmericanCholecalciferolCOVID-19DementiaDiabetes MellitusFemaleHumansMalePrevalenceStatus AsthmaticusVitamin DVitamin D Deficiency25-hydroxyvitamin DAntigens, Neoplasmcancerocerebral antigen, humanCholecalciferolVitamin D25-hydroxyvitamin DAfrican AmericanblacksEuropean Americanhealth disparitiesHispanicUVBvitamin Dwhites

Identifiers

PMID33546262
PMCPMC7913332
OpenAlexW3127225653

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.