Journal
NUTRITION REVIEWS
Volume 79, Issue 4, Pages 361-381Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/nutrit/nuaa030
Keywords
anxiety; cognition; dementia; depression; memory; mental health; stress; vegan; vegetarian diet; well-being
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Funding
- Alpro Foundation, Welvelgem, Belgium
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The meta-analysis found that vegan or vegetarian diets were associated with a higher risk of depression and lower anxiety scores, but no differences were found in other outcomes. Subgroup analyses of anxiety showed a higher risk of anxiety among participants under 26 years of age and in studies with higher quality.
Context: Vegetarian and vegan diets are increasing in popularity. Although they provide beneficial health effects, they may also lead to nutritional deficiencies. Cognitive impairment and mental health disorders have a high economic burden. Objective: A meta-analysis was conducted to examine the relationship between vegan or vegetarian diets and cognitive and mental health. Data Sources: PubMed, Scopus, ScienceDirect, and Proquest databases were examined from inception to July 2018. Study Selection: Original observational or interventional human studies of vegan/vegetarian diets were selected independently by 2 authors. Data Extraction: Raw means and standard deviations were used as continuous outcomes, while numbers of events were used as categorical outcomes. Results: Of 1249 publications identified, 13 were included, with 17 809 individuals in total. No significant association was found between diet and the continuous depression score, stress, well-being, or cognitive impairment. Vegans/vegetarians were at increased risk for depression (odds ratio = 2.142; 95%CI, 1.105-4.148) and had lower anxiety scores (mean difference = -0.847; 95%CI, -1.677 to -0.018). Heterogeneity was large, and thus subgroup analyses showed numerous differences. Conclusions: Vegan or vegetarian diets were related to a higher risk of depression and lower anxiety scores, but no differences for other outcomes were found. Subgroup analyses of anxiety showed a higher risk of anxiety, mainly in participants under 26 years of age and in studies with a higher quality. More studies with better overall quality are needed to make clear positive or negative associations.
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