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 accessAbstract
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
Cites
Statistics
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Verification
Claims the paper makes
45 Not checked yet · 12 Own interpretation
In the paper
“In addition, relationships between nutrition and longstanding mental illness are compounded by barriers to maintaining a healthy diet.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
What the sources say
- Not checked yetcites [4] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Healthy eating patterns, such as the Mediterranean diet, are associated with better mental health than “unhealthy” eating patterns, such as the Western diet”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
What the sources say
- Not checked yetcites [3] source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“epidemiological research has observed that adherence to healthy or Mediterranean dietary patterns—high consumption of fruits, vegetables, nuts, and legumes; moderate consumption of poultry, eggs, and dairy products; and only occasional consumption of red meat—is associated with a reduced risk of depression.3”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
What the sources say
- Not checked yetcites [3] source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, the nature of these relations is complicated by the clear potential for reverse causality between diet and mental health (fig 1).”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
boostedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Rests on an assumption: Alterations in food choices or preferences in response to temporary psychological state are common human experiences.
- Rests on an assumption: Mood itself can affect our food choices.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“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”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
In the paper
“These barriers disproportionality affect people with mental illness and include the financial and environmental determinants of health, and even the appetite inducing effects of psychiatric medications.4”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
What the sources say
- Not checked yetcites [4] source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
None of the sources cited for this claim have been checked yet.
In the paper
“Thus, high dietary glycaemic load, and the resultant compensatory responses, could lower plasma glucose to concentrations that trigger the secretion of autonomic counter-regulatory hormones such as cortisol, adrenaline, growth hormone, and glucagon.5 9”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Mood and carbohydrates
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Studies have found that sustained adherence to Mediterranean dietary patterns can reduce markers of inflammation in humans.14”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Diet, immune activation, and depression
What the sources say
- Not checked yetcites [14] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, other processes may explain the observed relationships.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Mood and carbohydrates
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Although mood itself can affect our food choices, plausible mechanisms exist by which high consumption of processed carbohydrates could increase the risk of depression and anxiety—for example, through repeated and rapid increases and decreases in blood glucose.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Mood and carbohydrates
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Rests on an assumption: Mood itself can affect our food choices.
- Probably not a substantial claim. 6
- It may state two separate claims as one. 7
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The effects of certain foods or dietary patterns on glycaemia, immune activation, and the gut microbiome may play a role in the relationships between food and mood”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“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”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Abstract
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: unclear — It is unclear why the paper says it holds.
It may state two separate claims as one.
In the paper
“Consumption of highly refined carbohydrates can increase the risk of obesity and diabetes.5”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Mood and carbohydrates
What the sources say
- Not checked yetcites [5] source
plainconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Furthermore, the inflammatory response to foods with a high glycaemic index13 raises the possibility that diets with a high glycaemic index are associated with symptoms of depression through the broader connections between mental health and immune activation.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Mood and carbohydrates
What the sources say
- Not checked yetcites [13] source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“For example, recent clinical research has observed that stressors experienced the previous day, or a personal history of major depressive disorders, may cancel out the beneficial effects of healthy food choices on inflammation and mood.22”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Diet, immune activation, and depression
What the sources say
- Not checked yetcites [22] source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Indeed, the inflammatory effects of a diet high in calories and saturated fat have been proposed as one mechanism through which the Western diet may have detrimental effects on brain health, including cognitive decline, hippocampal dysfunction, and damage to the blood-brain barrier.15”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Diet, immune activation, and depression
What the sources say
- Not checked yetcites [15] source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
In the paper
“Furthermore, as heightened inflammation occurs in only some clinically depressed individuals, anti-inflammatory interventions may only benefit certain people characterised by an “inflammatory phenotype,” or those with comorbid inflammatory conditions.18”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Diet, immune activation, and depression
What the sources say
- Not checked yetcites [18] source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Furthermore, whether changes to the gut microbiome induced by diet can affect depressive symptoms or clinical depressive disorders, and the time in which this could feasibly occur, remains to be shown.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Brain, gut microbiome, and mood
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. The paper may give no reason why it holds. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Conversely, the consumption of a diet high in fibres, polyphenols, and unsaturated fatty acids (as found in a Mediterranean diet) can promote gut microbial taxa which can metabolise these food sources into anti-inflammatory metabolites,15 28 such as short chain fatty acids, while lowering the production of secondary bile acids and p-cresol.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Brain, gut microbiome, and mood
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“For example, the later consequences of a poor diet include obesity and diabetes, which have already been shown to be associated with poorer mental health.11 31 32 33”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Priorities and next steps
What the sources say
boostedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, no causal relationship between specific microbes, or their metabolites, and complex human emotions has been established so far.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Brain, gut microbiome, and mood
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. The paper may give no reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This message supports the idea that creating environments and developing measures that promote healthy, nutritious diets, while decreasing the consumption of highly processed and refined “junk” foods may provide benefits even beyond the well known effects on physical health, including improved psychological wellbeing.”
§ Food and mood: how do diet and nutrition affect mental wellbeing? > Priorities and next steps
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: fails — It may be too vague to check against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: fails — The paper may give no reason why it holds.
Probably not a substantial claim. It may be too vague to check against evidence. The paper may give no reason why it holds.
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.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“A poor diet has been linked to depression through mechanisms such as inflammation [428].”
From Biological, Psychological, and Social Determinants of Depression: A Review of Recent Literature (2021) · cites this paper as [428]
Citations
Cites
Mind-altering microorganisms: the impact of the gut microbiota on brain and behaviour
Cryan, J. F., & Dinan, T. G. (2012) · Nature Reviews Neuroscience · doi:10.1038/nrn3346 · Cited by 4,572
Ludwig (2002) · doi:10.1001/jama.287.18.2414 · Cited by 1,775
The Immunomodulatory and Anti-Inflammatory Role of Polyphenols
Yahfoufi, N., Alsadi, N., Jambi, M., & Matar, C. (2018) · Nutrients · doi:10.3390/nu10111618 · Cited by 1,737
Kelly, J. R., Borre, Y., O' Brien, C., Patterson, E., El Aidy, S., Deane, J., Kennedy, P. J., Beers, S., Scott, K., Moloney, G., et al. (2016) · Journal of Psychiatric Research · doi:10.1016/j.jpsychires.2016.07.019 · Cited by 1,683
Firth, J., Siddiqi, N., Koyanagi, A., Siskind, D., Rosenbaum, S., Galletly, C., Allan, S., Caneo, C., Carney, R., Carvalho, A. F., et al. (2019) · The Lancet Psychiatry · doi:10.1016/s2215-0366(19)30132-4 · Cited by 1,531
Self-citationDepression Is the Leading Cause of Disability Around the World
Friedrich, M. J. (2017) · JAMA · doi:10.1001/jama.2017.3826 · Cited by 1,459
Seaquist, E. R., Anderson, J., Childs, B., Cryer, P., Dagogo-Jack, S., Fish, L., Heller, S. R., Rodriguez, H., Rosenzweig, J., & Vigersky, R. (2013) · Diabetes Care · doi:10.2337/dc12-2480 · Cited by 1,389
Consumption of fermented milk product with probiotic modulates brain activity
Tillisch, K., Labus, J., Kilpatrick, L., Jiang, Z., Stains, J., Ebrat, B., Guyonnet, D., Legrain–Raspaud, S., Trotin, B., Naliboff, B., et al. (2013) · Gastroenterology · doi:10.1053/j.gastro.2013.02.043 · Cited by 1,192
Self-citationJacka, F. N., O’Neil, A., Opie, R., Itsiopoulos, C., Cotton, S., Mohebbi, M., Castle, D., Dash, S., Mihalopoulos, C., Chatterton, M. L., et al. (2017) · BMC Medicine · doi:10.1186/s12916-017-0791-y · Cited by 1,093
The Effect of Mediterranean Diet on Metabolic Syndrome and its Components
Kastorini, C.-M., Milionis, H. J., Esposito, K., Giugliano, D., Goudevenos, J. A., & Panagiotakos, D. B. (2011) · Journal of the American College of Cardiology · doi:10.1016/j.jacc.2010.09.073 · Cited by 1,087
Cited by
Sorted by citations
Biological, Psychological, and Social Determinants of Depression: A Review of Recent Literature
Remes, O., Mendes, J. F., & Templeton, P. (2021) · Brain Sciences · doi:10.3390/brainsci11121633 · Cited by 482
Brain–gut–microbiota axis in depression: A historical overview and future directions
Chang, L., Wei, Y., & Hashimoto, K. (2022) · Brain Research Bulletin · doi:10.1016/j.brainresbull.2022.02.004 · Cited by 407
Wei, H., Yu, C., Zhang, C., Ren, Y., Guo, L., Wang, T., Chen, F., Li, Y., Zhang, X., Wang, H., et al. (2023) · Biomedicine & Pharmacotherapy · doi:10.1016/j.biopha.2023.114308 · Cited by 237
Cheng, J., Hu, H., Ju, Y., Liu, J., Wang, M., Liu, B., & Zhang, Y. (2024) · General Psychiatry · doi:10.1136/gpsych-2023-101374 · Cited by 224
Abbaspour, N. (2024) · Applied Food Research · doi:10.1016/j.afres.2024.100468 · Cited by 171
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)
- PMC
- PMC7322666
- 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
- Update notices
- correction (2020-11-09)
- Open access
- hybrid
- doi.org
- Licence
- 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.
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