Evidence map›Paper›PMID 33161940›Full record

ArticleDeutsches Arzteblatt international2020

Vitamin and Mineral Status in a Vegan Diet.

Cornelia Weikert, Iris Trefflich, Juliane Menzel, Rima Obeid, Alessa Longree, Jutta Dierkes, Klaus Meyer, Isabelle Herter-Aeberli, Knut Mai, Gabriele I Stangl and 4 more

Open access · greenAbstract read
In one paragraph

Article in Deutsches Arzteblatt international, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 75 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
75citing papers in PubMed, 2 pooled it
12.8field-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

75 citing papers in PubMed, 2 syntheses or guidelines pooled it, 128 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Assessment of vitamin A, vitamin BEuropean journal of nutrition · 2025
    Trial
  4. Trial
  5. Trial
  6. Trial
  7. Review
  8. Article
  9. BiofortifiedMolecules (Basel, Switzerland) · 2026
    Review
  10. Review
  11. Article
  12. Article
  13. Article
  14. Review
  15. Article
  16. Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz · 2025
    Article
  17. Review
  18. Article
  19. Article
  20. Review

15 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

14 authors at 1 institution in 1 country.

Cornelia WeikertGerman Federal Institute for Risk Assessment, Department of Food Safety, Berlin, Germany; Department of Clinical Chemistry and Laboratory Medicine, Saarland University Hospital, Homburg/Saar, Germany; Department of Clinical Medicine, Center for Nutrition, University of Bergen, Bergen, Norway; BEVITAL AS, Bergen, Norway; Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland; Medical Department of Endocrinology, Diabetes and Metabolic Medicine, Charité-Universitätsmedizin Berlin, Berlin, Germany; Clinical Research Unit, Berlin Institute of Health (BIH), Berlin, Germany; Charité-Center for Cardiovascular Research (CCR), Berlin, Germany; DZHK (German Center for Cardiovascular Research), Berlin site, Berlin, Germany; Institute of Agricultural and Nutritional Science, Martin Luther University Halle-Wittenberg, Halle, Germany; Department of Food Chemistry, Institute of Nutritional Science, University of Potsdam, Nuthetal, Germany; TraceAge DFG Research Unit on Interactions of Essential Trace Elements in Healthy and Diseased Elderly, Potsdam-Berlin-Jena, Germany.
Iris Trefflich
Juliane Menzel
Rima Obeid
Alessa Longree
Jutta Dierkes
Klaus Meyer
Isabelle Herter-Aeberli
Knut Mai
Gabriele I Stangl
Sandra M Müller
Tanja Schwerdtle
Alfonso Lampen
Klaus Abraham
Berlin Institute of Health at Charité - Universitätsmedizin Berlin · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundIn Germany, public interest in a vegan diet is steadily growing. There are, however, no current data on the macro- and micronutrient status of vegans.

methodsIn a cross-sectional study entitled "The Risks and Benefits of a Vegan Diet" (RBVD), we investigated the dietary intake, basic laboratory parameters, vitamin status, and trace-element status of 36 vegans and 36 persons on an omnivorous diet. Each group consisted of 18 men and 18 women aged 30-60.

resultsNearly all the vegans and one-third of the persons on a mixed diet had consumed supplements in the previous 4 weeks. Vegans and nonvegans had similar energy intake but differed in the intake of both macronutrients (e.g., dietary fiber) and micronutrients (e.g., vitamins B12, B2, D, E, and K, as well as folate, iodine, and iron). There were no intergroup differences in the biomarkers of vitamin B12, vitamin D, or iron status. The ferritin values and blood counts indicated iron deficiency in four vegans and three non-vegans. Measurements in 24-hour urine samples revealed lower calcium excretion and markedly lower iodine excretion in vegans compared to non-vegans; in one-third of the vegans, iodine excretion was lower than the WHO threshold value (<20 μg/L) for severe iodine deficiency.

conclusionVitamin B12 status was similarly good in vegans and non-vegans, even though the vegans consumed very little dietary B12. This may be due to the high rate of supplementation. The findings imply a need to also assure adequate iodine intake in the population, especially among persons on a vegan diet.

Indexed as

Diet, VeganVitaminsAdultCross-Sectional StudiesDiet, VegetarianFemaleGermanyHumansMaleMiddle AgedMineralsMineralsVitamins

Identifiers

PMID33161940
PMCPMC7779846
OpenAlexW3099488117

What OpenQuestion holds

Textmetadata
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.