Food Label Evidence

Evidence map

Portion estimation: what the evidence base looks like

11 publications, 3 of them trials and 5 syntheses. This page describes the shape of that literature rather than summarising its conclusions.

Updated 4 min read 11 citations

What the evidence on portion estimation is made of Of 11 publications on this topic, the breakdown by study type: 5 meta-analysis, 3 randomised trial, 1 review, 2 other. 5312meta-analysis (5)randomised trial (3)review (1)other (2)
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 portion estimation literature was published Publication years for the 11 papers on this topic, grouped into bands from before 2015 through to 2023 onwards. 2020-20224 papers2015-20193 papers2023 onwards2 papersBefore 20152 papers
Still active. The most recent paper here is from 2025, 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. Application of Augmented Reality Technology as a Dietary Monitoring and Control Measure Among Adults: A Systematic Review — Gonzalez GV, Mao B, Wang R et al., 2025, systematic review
  2. A systematic review of recall errors associated with portion size estimation aids in children — de Vlieger NM, Weltert M, Molenaar A et al., 2020, systematic review
  3. Portion size estimation in dietary assessment: a systematic review of existing tools, their strengths and limitations — Amoutzopoulos B, Page P, Roberts C et al., 2020, systematic review
  4. The Role of Various Forms of Training on Improved Accuracy of Food-Portion Estimation Skills: A Systematic Review of the Literature — Hooper A, McMahon A, Probst Y, 2019, systematic review
  5. Dietary assessment in minority ethnic groups: a systematic review of instruments for portion-size estimation in the United Kingdom — Almiron-Roig E, Aitken A, Galloway C et al., 2017, systematic review
  6. Immersive Virtual Reality Dietitian Improves Portion Control Self-Efficacy and Portion Size Estimation Accuracy — Braga BC, Long J, Maksi S et al., 2025, randomised controlled trial
  7. The international food unit: a new measurement aid that can improve portion size estimation — Bucher T, Weltert M, Rollo ME et al., 2017, randomised controlled trial
  8. Portion-size estimation training in second- and third-grade American Indian children — Weber JL, Cunningham-Sabo L, Skipper B et al., 1999, randomised controlled trial
  9. Merging dietary assessment with the adolescent lifestyle — Schap TE, Zhu F, Delp EJ et al., 2014, review
  10. Development and evaluation of image-series for portion size estimation in dietary assessment among adults — Salvesen L, Engeset D, Øverby NC et al., 2021, journal article
How much research is there on portion estimation?
11 publications are indexed here, of which 3 are trials and 5 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 2025. 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. Application of Augmented Reality Technology as a Dietary Monitoring and Control Measure Among Adults: A Systematic Review Gonzalez GV, Mao B, Wang R, et al. · Nutrients · 2025 · Systematic review DOIPubMed 41470837Full text
  2. A systematic review of recall errors associated with portion size estimation aids in children de Vlieger NM, Weltert M, Molenaar A, et al. · Appetite · 2020 · Systematic review DOIPubMed 31751634
  3. Portion size estimation in dietary assessment: a systematic review of existing tools, their strengths and limitations Amoutzopoulos B, Page P, Roberts C, et al. · Nutrition reviews · 2020 · Systematic review DOIPubMed 31999347
  4. The Role of Various Forms of Training on Improved Accuracy of Food-Portion Estimation Skills: A Systematic Review of the Literature Hooper A, McMahon A, Probst Y · Advances in nutrition (Bethesda, Md.) · 2019 · Systematic review DOIPubMed 30629097Full text
  5. Dietary assessment in minority ethnic groups: a systematic review of instruments for portion-size estimation in the United Kingdom Almiron-Roig E, Aitken A, Galloway C, et al. · Nutrition reviews · 2017 · Systematic review DOIPubMed 28340101Full text
  6. Immersive Virtual Reality Dietitian Improves Portion Control Self-Efficacy and Portion Size Estimation Accuracy Braga BC, Long J, Maksi S, et al. · Journal of nutrition education and behavior · 2025 · Randomised controlled trial DOIPubMed 40019425
  7. The international food unit: a new measurement aid that can improve portion size estimation Bucher T, Weltert M, Rollo ME, et al. · The international journal of behavioral nutrition and physical activity · 2017 · Randomised controlled trial DOIPubMed 28899402Full text
  8. Portion-size estimation training in second- and third-grade American Indian children Weber JL, Cunningham-Sabo L, Skipper B, et al. · The American journal of clinical nutrition · 1999 · Randomised controlled trial DOIPubMed 10195603
  9. Merging dietary assessment with the adolescent lifestyle Schap TE, Zhu F, Delp EJ, et al. · Journal of human nutrition and dietetics : the official journal of the British Dietetic Association · 2014 · Review DOIPubMed 23489518Full text
  10. Development and evaluation of image-series for portion size estimation in dietary assessment among adults Salvesen L, Engeset D, Øverby NC, et al. · Journal of nutritional science · 2021 · Journal article DOIPubMed 33889386Full text
  11. The accuracy of portion size estimation using food images and textual descriptions of portion sizes: an evaluation study Lucassen DA, Willemsen RF, Geelen A, et al. · Journal of human nutrition and dietetics : the official journal of the British Dietetic Association · 2021 · Journal article DOIPubMed 33761165Full text