Cited by 475Nutritional Studies and DietFatty Acid Research and HealthNutrition, Health and Food Behavior

The DOI matches its Crossref record; 43 of the 43 references it cites were found in a registry or an index; none of the 63 sources its claims cite is checked for support yet.

Food and mood: how do diet and nutrition affect mental wellbeing?

Open access

Abstract

Poor nutrition may be a causal factor in the experience of low mood, and improving diet may help to protect not only the physical health but also the mental health of the population, say Joseph Firth and colleagues

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

Poor nutrition may be a causal factor in low mood, and healthy dietary patterns such as the Mediterranean diet are associated with better mental health than “unhealthy” Western diets. Proposed mechanisms include glycaemia, immune activation, and the gut microbiome, but causal pathways and clinical applications remain uncertain.

Key findings

  • Healthy eating patterns, such as the Mediterranean diet, are associated with reduced risk of depression, whereas “unhealthy” eating patterns are linked to poorer mental health.
  • Diets with high glycaemic index/load are associated with depressive symptoms; experimental exposure to high glycaemic load increases depressive symptoms in healthy volunteers with a moderately large effect.
  • Inflammation may link diet and depression: Mediterranean diets can reduce inflammation markers, high-calorie/saturated-fat meals stimulate immune activation, and anti-inflammatory agents can significantly reduce depressive symptoms.
  • Gut microbiome evidence is promising but not causal: probiotics can alter brain response to emotional attention tasks and may reduce depression symptoms, yet no causal relationship between specific microbes or metabolites and complex human emotions has been established.

Methods

  • Design: narrative/analysis article synthesizing existing evidence; no primary data collection or systematic review methods are described.
  • Evidence base: cites epidemiological, longitudinal, clinical experimental, observational, and randomized controlled trial findings on diet, glycaemia, inflammation, gut microbiome, and mental health.
  • Main analysis: conceptual synthesis of hypothesized pathways—glycaemia, immune activation, and gut-brain signalling—plus discussion of intervention evidence and research priorities.

Limitations

  • The paper states more research is needed to understand mechanisms and determine if, how, and when nutrition can improve mental health; causal roles of dietary inflammation are not established, and whether diet-induced microbiome changes affect depressive symptoms or clinical depressive disorders remains to be shown.
  • The paper notes reverse causality and barriers to healthy diets in people with mental illness; a recent large trial found no significant benefits of a Mediterranean-diet behavioural intervention for adults with subclinical depressive symptoms, while smaller trials in current depression showed moderately large improvements, and expectations may affect results.
  • Evident from the text: as a narrative review/analysis, it does not report a systematic search, risk-of-bias assessment, or meta-analysis, so conclusions rely on cited studies of varying designs.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1136/bmj.m2382

Cites

43 of 43 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 63 cited sources checked · 0 supported · 0 flagged

Show all 45 claims

  • Probably not a substantial claim. 6
  • It may state two separate claims as one. 7
12 of 12
  • The paper relies on this without support.

    The causes of mental illness are many and varied, and they will often present and persist independently of nutrition and diet.

    “At the same time, it is important to be remember that the causes of mental illness are many and varied, and they will often present and persist independently of nutrition and diet.”
  • The paper relies on this without support.

    Stigmatisation about an individual’s dietary choices and mental health could itself be a causal pathway to increasing the risk of poorer mental health.

    “Indeed, such stigmatisation could be itself be a casual pathway to increasing the risk of poorer mental health.”
  • The paper relies on this without support.

    Alterations in food choices or preferences in response to temporary psychological state are common human experiences.

    “For example, alterations in food choices or preferences in response to our temporary psychological state—such as “comfort foods” in times of low mood, or changes in appetite from stress—are common human experiences.”
  • The paper relies on this without support.

    Mood itself can affect our food choices.

    “Although mood itself can affect our food choices”
  • The paper relies on this without support.

    The relationships between diet and mental health are complex and multidirectional.

    “While acknowledging the complex, multidirectional nature of the relationships between diet and mental health (fig 1), in this article we focus on the ways in which certain foods and dietary patterns could affect mental health.”
5 of 5

Claims other papers make about this one

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Citations

Cites

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Metadata

Authors
Firth, J., Gangwisch, J. E., Borsini, A., Wootton, R. E., & Mayer, E. A.
Affiliations
  • University of Manchester (GB)
  • New York State Psychiatric Institute (US)
  • King's College London (GB)
  • University Hospitals Bristol NHS Foundation Trust (GB)
  • University of California, Los Angeles (US)
Corresponding author
Firth, Joseph
Venue
BMJ
Publisher
BMJ
Published
2020-06-29
Volume
369
Pages
m2382
ISSN
1756-1833 (ISSN-L)
OpenAlex
W3037973279
Cited by
475
References
42
Citations by year
2026: 65 · 2025: 113 · 2024: 101 · 2023: 77 · 2022: 64 · 2021: 48 · 2020: 6
FWCI
36.56
Type
journal article
Language
en
Open access
Locations
  • BMJ (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (publishedVersion, other-oa)
  • HighWire Press Open Archive (submittedVersion)
  • Explore Bristol Research (submittedVersion, cc-by-nc)
Funders
  • U.S. Department of Defense
  • Danone
  • South London and Maudsley NHS Foundation Trust
  • University Hospitals Bristol NHS Foundation Trust
  • UK Research and Innovation
  • NIHR Biomedical Research Centre, Royal Marsden NHS Foundation Trust/Institute of Cancer Research
  • Axial Biotherapeutics
  • National Institute for Health and Care Research (NIHR-INF-0632)
  • King's College London
  • European Commission (HORIZON2020)
  • University of Bristol
  • Eisai
  • Medical Research Council
  • National Institute of Diabetes and Digestive and Kidney Diseases
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Health Sciences › Nursing › Nutrition and Dietetics › Fatty Acid Research and Health
  • Health Sciences › Nursing › Nutrition and Dietetics › Nutrition, Health and Food Behavior
Keywords
diet, nutrition, psychological well-being, depressive mood, depression, mental health
MeSH terms
Gastrointestinal Microbiome, Diet, Healthy, Anxiety, Cognition, Depression, Humans, Inflammation, Nutritional Physiological Phenomena, Nutritional Status

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

A language model drew the claims from the paper on 2026-10-09, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).

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