Carbon Evidence

Evidence map

Diet shift: what the evidence base looks like

11 publications, 2 of them trials and 6 syntheses. This page describes the shape of that literature rather than summarising its conclusions.

Updated 4 min read 11 citations

What the evidence on diet shift is made of Of 11 publications on this topic, the breakdown by study type: 6 meta-analysis, 2 randomised trial, 2 review, 1 other. 6221meta-analysis (6)randomised trial (2)review (2)other (1)
11 publications, by study type. Volume is not strength — the same count can be a settled question or a pile of commentary, and which one it is depends almost entirely on this breakdown. Harvested from PubMed and Crossref; publication type as recorded by the source.

What this literature is made of

The synthesis is ahead of the primary literature here — reviews and meta-analyses drawing on a modest number of underlying studies. Treat confident conclusions with the caution the sample size deserves.

The distinction that matters most is between synthesis and primary research. A meta-analysis pools trials and is the closest thing to a settled answer a field produces. A narrative review is one group's reading of the same material and can be selective without being dishonest. Counting them together, which most citation counts do, obscures exactly the thing you want to know.

When the diet shift literature was published Publication years for the 11 papers on this topic, grouped into bands from before 2015 through to 2023 onwards. 2023 onwards10 papers2015-20191 papers
Still active. The most recent paper here is from 2026, so this is a field where an answer written today may not hold for long. Publication years as recorded by PubMed and Crossref.

How this page is built

Everything above is computed from the citations this site harvested from PubMed and Crossref, not written by hand. When the weekly harvest finds a new paper on this topic, these counts change and the characterisation changes with them. That is the point: a hand-written claim about how strong an evidence base is starts decaying the day it is written.

Publication type is taken as the source records it. That is imperfect — journals label inconsistently, and a paper indexed as a "review" may be a systematic one — so treat the bands as approximate. They are accurate enough to distinguish a trial literature from a commentary literature, which is the distinction that matters.

The strongest work on this topic

Ordered by study design first, then recency. The full set is listed in the references below.

  1. Mindfulness and sustainable diets: a meta-analysis and CO(2) emission savings scenarios — Kosteletzky A, Thomas SM, Jochem C, 2026, meta-analysis
  2. Metabolic, adherence, and sustainability outcomes of plant-based low-carbohydrate and ketogenic diets: A systematic review of clinical evidence — Mazzola G, Rondanelli M, Cabrini C et al., 2026, systematic review
  3. The effectiveness of mobile app-based interventions in facilitating behaviour change towards healthier and more sustainable diets: a systematic review and meta-analysis — Curtin E, Green R, Brown KA et al., 2025, meta-analysis
  4. Impact of consuming an environmentally protective diet on micronutrients: a systematic literature review — Leonard UM, Leydon CL, Arranz E et al., 2024, systematic review
  5. Aligning Environmental Sustainability, Health Outcomes, and Affordability in Diet Quality: A Systematic Review — Leydon CL, Leonard UM, McCarthy SN et al., 2023, systematic review
  6. The Impacts of Dietary Change on Greenhouse Gas Emissions, Land Use, Water Use, and Health: A Systematic Review — Aleksandrowicz L, Green R, Joy EJ et al., 2016, systematic review
  7. Changing the default meal option at university events to reduce harmful environmental impacts: Six randomized controlled trials — Zhang AW, Wharton C, Cloonan S et al., 2024, randomised controlled trial
  8. The effect of an app-based dietary intervention on diet-related greenhouse gas emissions - results from a randomized controlled trial — Pitt S, Sjöblom L, Bälter K et al., 2023, randomised controlled trial
  9. Consumer perceptions of healthy and sustainable eating — Hazley D, Kearney JM, 2024, review
  10. Moving towards more sustainable diets: Is there potential for a personalised approach in practice? — Davies KP, Gibney ER, O'Sullivan AM, 2023, review
How much research is there on diet shift?
11 publications are indexed here, of which 2 are trials and 6 are syntheses.
Does more research mean a stronger conclusion?
No. Composition matters more than volume — five randomised trials support a claim far better than fifty commentaries, and citation counts do not distinguish between them.
How current is this?
The most recent paper indexed here is from 2026. The set is refreshed weekly from PubMed and Crossref.
Why does this page not tell me the answer?
Because summarising a literature into a conclusion requires reading it, and doing that automatically is how confident nonsense gets published. This page tells you how much weight a conclusion could bear; the articles on this site do the interpreting.

References

Every citation below links to the original peer-reviewed record on PubMed or via DOI. Nothing here is a substitute for medical advice.

  1. Metabolic, adherence, and sustainability outcomes of plant-based low-carbohydrate and ketogenic diets: A systematic review of clinical evidence Mazzola G, Rondanelli M, Cabrini C, et al. · Nutrition (Burbank, Los Angeles County, Calif.) · 2026 · Systematic review DOIPubMed 42048756
  2. Mindfulness and sustainable diets: a meta-analysis and CO(2) emission savings scenarios Kosteletzky A, Thomas SM, Jochem C · Nutrition journal · 2026 · Meta-analysis DOIPubMed 42410600Full text
  3. The effectiveness of mobile app-based interventions in facilitating behaviour change towards healthier and more sustainable diets: a systematic review and meta-analysis Curtin E, Green R, Brown KA, et al. · The international journal of behavioral nutrition and physical activity · 2025 · Meta-analysis DOIPubMed 41035009Full text
  4. Impact of consuming an environmentally protective diet on micronutrients: a systematic literature review Leonard UM, Leydon CL, Arranz E, et al. · The American journal of clinical nutrition · 2024 · Systematic review DOIPubMed 38569787
  5. Aligning Environmental Sustainability, Health Outcomes, and Affordability in Diet Quality: A Systematic Review Leydon CL, Leonard UM, McCarthy SN, et al. · Advances in nutrition (Bethesda, Md.) · 2023 · Systematic review DOIPubMed 37532100Full text
  6. The Impacts of Dietary Change on Greenhouse Gas Emissions, Land Use, Water Use, and Health: A Systematic Review Aleksandrowicz L, Green R, Joy EJ, et al. · PloS one · 2016 · Systematic review DOIPubMed 27812156Full text
  7. Changing the default meal option at university events to reduce harmful environmental impacts: Six randomized controlled trials Zhang AW, Wharton C, Cloonan S, et al. · Appetite · 2024 · Randomised controlled trial DOIPubMed 38908405
  8. The effect of an app-based dietary intervention on diet-related greenhouse gas emissions - results from a randomized controlled trial Pitt S, Sjöblom L, Bälter K, et al. · The international journal of behavioral nutrition and physical activity · 2023 · Randomised controlled trial DOIPubMed 37821876Full text
  9. Consumer perceptions of healthy and sustainable eating Hazley D, Kearney JM · The Proceedings of the Nutrition Society · 2024 · Review DOIPubMed 39233445
  10. Moving towards more sustainable diets: Is there potential for a personalised approach in practice? Davies KP, Gibney ER, O'Sullivan AM · Journal of human nutrition and dietetics : the official journal of the British Dietetic Association · 2023 · Review DOIPubMed 37545042
  11. Plant-Based Diet Indices with Greenhouse Gas Emissions and Risk of Cardiometabolic Diseases and All-Cause Mortality: Longitudinal China Cohort Study Lv Y, Wu M, Liu W, et al. · Nutrients · 2025 · Journal article DOIPubMed 40218910Full text