**5. Conclusions**

Although the results of this review reflect a field of study that is preliminary and emerging, the findings are consistent with established evidence about healthy eating patterns [112]. There is evidence of an association between healthy eating patterns and reduced anxiety symptoms. In the absence of a contraindication such as an allergy or specific medical condition, dietary interventions are considered low in risk, cost-effective [113], may confer secondary benefit to physical aspects of health and have at least some evidence suggesting a beneficial effect. However, the delivery of nutritional counselling as part of the treatment of anxiety disorders by primary care, psychiatry, dieticians, naturopaths, or other care providers is currently limited.

Prospective observational studies are needed to more clearly establish the causal role of diet factors in the development and progression of anxiety disorders. High quality intervention studies involving participants with anxiety disorders are warranted in order to evaluate the therapeutic potential of nutrition interventions in the management of anxiety disorders.

**Supplementary Materials:** The following are available online at https://www.mdpi.com/article/10 .3390/nu13124418/s1, File S1: Search Strategy, File S2: Excluded studies, File S3: All included studies.

**Author Contributions:** Conceptualization, M.A., L.L. and K.C.; methodology, M.A., L.L. and K.C.; data extraction, M.A., D.R., T.S., N.S., V.C., T.R. and I.C. formal analysis, M.A. and L.L.; writing original draft preparation, M.A.; writing—review and editing, L.L., U.N., D.R., T.S., N.S., V.C., T.R., I.C. and K.C. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Supporting data available on request.

**Acknowledgments:** Becky Skidmore: design of search strategy.

**Conflicts of Interest:** The authors declare no conflict of interest.
