Association Between Anxiety and Suicidal Ideation, and Dietary Patterns

Background/Objectives: Diet is considered one of the most important modifiable risk factors for non-communicable diseases in modern society. While numerous studies have reported on the association between diet and mental health, including anxiety, research examining the relationship between dietary patterns and mental health is relatively scarce. Therefore, this study aimed to analyze the association between anxiety and suicidal ideation with macronutrient intake. Methods: This study was conducted on adults aged 19 years or older using raw data from the 2021–2023 Korea National Health and Nutrition Examination Survey. Excluding those with missing test items, 9002 subjects were included. The study subjects were divided into four groups based on macronutrient intake (normal diet group, high-carbohydrate diet group, high-fat diet group, and high-protein diet group; based on Korean Dietary Reference). Results: There was no significant association between dietary patterns and suicidal ideation. However, after adjusting for covariates for moderate or severe anxiety in the HP diet group, the odds ratio was reported to be 0.492 (95% CI 0.298–0.810). Subgroup analysis by gender revealed no significant difference between dietary types and anxiety in women, but in men, the HP diet significantly lowered the odds of moderate or severe anxiety (OR 0.230, 95% CI 0.089–0.599). Conclusions: This study found that higher protein intake was associated with lower levels of moderate to severe anxiety, and this trend was statistically significant, particularly in men. Further research is needed to confirm the causal relationship.