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Encyclopedia of Nutritional Psychology

Anxiety

Evidence-informed definition Updated September 16, 2026 How to cite this entry

Anxiety is an emotion we experience when we anticipate danger, but that danger has not yet materialized. In such a situation, we experience a sense of uncertainty as we prepare for what might happen, even if the threat is not immediate or we are not even sure what the nature of the threat might be. Sometimes, the threat might not even (objectively) exist.

Anxiety involves interactions among psychological processes, the nervous system, hormones, and physiological responses to perceived or anticipated threats. These responses can influence sleep, appetite, digestion, and eating behaviors. From a nutritional psychology perspective, these connections are important because dietary patterns and nutritional status may interact with biological processes involved in stress regulation and emotional well-being, although nutrition alone does not explain or treat anxiety.

The gut-brain axis provides another area for understanding the relationship between anxiety, nutrition, and mental health. Communication between the gut, gut microbiota, immune system, and brain can influence physiological processes associated with mood and stress. Research continues to investigate how diet and the gut environment may relate to anxiety-related experiences. A balanced dietary pattern supports overall health, while persistent or severe anxiety may require appropriate professional mental health support.

Author and reviewer

Editorial responsibility
Written by Ephi Morphew-Lu
Reviewed by CNP Encyclopedia Editorial Board
Evidence base

References and further reading

  1. Grupe DW, Nitschke JB. Uncertainty and anticipation in anxiety: an integrated neurobiological and psychological perspective. Nature Reviews Neuroscience. 2013;14(7):488–501. doi:10.1038/nrn3524. View source
  2. Sussman TJ, Jin J, Mohanty A. Top-down and bottom-up factors in threat-related perception and attention in anxiety. Biological Psychology. 2016;121(Pt B):160–171. doi:10.1016/j.biopsycho.2016.08.006. View source
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CNP (2026). Anxiety. In CNP Encyclopedia Editorial Board (Eds.), Encyclopedia of Nutritional Psychology. The Center for Nutritional Psychology.

https://www.nutritional-psychology.org.
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