Vegetarian diet and depression scores: A meta-analysis

Area of Science:

• Nutritional Psychiatry
• Mental Health Research
• Dietary Pattern Analysis

Background:

• Conflicting evidence exists regarding the association between vegetarian diets and depression.
• Some studies suggest higher depression scores in vegetarians, while others indicate lower scores.

Purpose of the Study:

• To conduct a meta-analysis to determine the significant association between vegetarian diet and depression scores.
• To resolve discrepancies in existing literature on vegetarianism and mental well-being.

Main Methods:

• A comprehensive keyword search was performed across major scientific databases.
• Included studies compared depression scores of vegetarians against a non-vegetarian control group.
• A conditional random-effects meta-analysis was conducted using R software.

Main Results:

• The analysis included 13 studies with a total of 49,889 participants (8,057 vegetarians, 41,832 non-vegetarians).
• Results indicated a significant difference, with vegetarians exhibiting higher depression scores compared to non-vegetarians.

Conclusions:

• Vegetarian individuals demonstrated higher depression scores than their non-vegetarian counterparts.
• High heterogeneity among studies necessitates further empirical research for definitive conclusions.
• Future studies should aim for greater geographical diversity to enhance cross-cultural insights.