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. 2021 May;40(5):3503-3521.
doi: 10.1016/j.clnu.2020.11.035. Epub 2020 Dec 7.

Intake and adequacy of the vegan diet. A systematic review of the evidence

Dimitra Rafailia Bakaloudi  1 , Afton Halloran  2 , Holly L Rippin  3 , Artemis Christina Oikonomidou  4 , Theodoros I Dardavesis  5 , Julianne Williams  6 , Kremlin Wickramasinghe  7 , Joao Breda  8 , Michail Chourdakis  9
Affiliations
Free article

Intake and adequacy of the vegan diet. A systematic review of the evidence

Dimitra Rafailia Bakaloudi et al. Clin Nutr. 2021 May.
Free article

Abstract

Background: Vegan diets, where animal- and all their by-products are excluded from the diet, have gained popularity, especially in the last decade. However, the evaluation of this type of diet has not been well addressed in the scientific literature. This study aimed to investigate the adequacy of vegan diets in European populations and of their macro- and micronutrient intakes compared to World Health Organization recommendations.

Methods: A systematic search in PubMed, Web of Science, IBSS, Cochrane library and Google Scholar was conducted and 48 studies (12 cohorts and 36 cross-sectional) were included.

Results: Regarding macronutrients, vegan diets are lower in protein intake compared with all other diet types. Veganism is also associated with low intake of vitamins B2, Niacin (B3), B12, D, iodine, zinc, calcium, potassium, selenium. Vitamin B12 intake among vegans is significantly lower (0.24-0.49 μg, recommendations are 2.4 μg) and calcium intake in the majority of vegans was below recommendations (750 mg/d). No significant differences in fat intake were observed. Vegan diets are not related to deficiencies in vitamins A, B1, Β6, C, E, iron, phosphorus, magnesium, copper and folate and have a low glycemic load.

Conclusions: Following a vegan diet may result in deficiencies in micronutrients (vitamin B12, zinc, calcium and selenium) which should not be disregarded. However, low micro- and macronutrient intakes are not always associated with health impairments. Individuals who consume a vegan diet should be aware of the risk of potential dietary deficiencies.

Keywords: European population; Health impact; Vegan diets; Veganism; WHO.

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Conflict of interest statement

Conflict of interest The authors declare that they have no competing interests for the content of this paper. The writing group takes sole responsibility for the content of this article and the content of this article reflects the views of the authors only. JB, KW and JW are staff members of the WHO Regional Office for Europe and HR and AH are WHO consultants. The World Health Organization is not liable for any use that may be made of the information contained therein.

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