Kaimen Rigor reviewed

Rigor-Reviewed Manuscript

Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.

Name: Kaimen Rigor review — Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.
Item: Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.
Rating: 39
Author: Alpha1

Dicken SJ, Jassil FC, Brown A, Kalis M, Stanley C, Ranson C, Ruwona T, Qamar S, Buck C, Mallik R, Hamid N, Bird JM, Brown A, Norton B, Gandini Wheeler-Kingshott CAM, Hamer M, van Tulleken C, Hall KD, Fisher A, Makaronidis J, Batterham RL

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Kaimen Rigor review — 1★ (Critical), 1 critical, 4 high issues for “Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.”

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This rigor review was examined and confirmed by Alpha1 Editorial · August 15, 2026

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Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.

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DOI

10.1038/s41591-025-03842-0

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Kaimen Rigor reviewed

Rigor-Reviewed Manuscript

Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.

Paper source

Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.

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Alpha1 Editorial

This rigor review was examined and confirmed by Alpha1 Editorial · August 15, 2026

Kaimen Rigor review

Kaimen Rigor reviewed

1 / 5

Critical — a demonstrable failure

Interventional Study

Critical

High-priority

How this rating was calculated▸

Started at 5★ — deductions

StatisticsImpossible or misreported statistic−1★
StatisticsStatistic did not reproduce−0.5★
IntegrityIntegrity concern−0.5★

A demonstrable critical failure caps the rating at the minimum, regardless of the deductions above.

Model-reported confidence: moderateReviewer agreement: highEngine: 7.39.0Source: full text

Not verified in this report

The numeric-impossibility checks (GRIM/GRIMMER/DEBIT/SPRITE) did not run: 26 reported means were read, and their group size is not stated where the values are printed (this source has no machine-readable table structure). These checks need the count the mean was averaged over, so none was performed.

Biggest issues1 demonstrable

01Significance claim does not survive recomputationdemonstrable
criticalOverreachrecomputedFull detail
Primary outcome p-value from mixed-effects model
“Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024)”
Find in source
02Printed percentage does not match its own count
highArithmeticrecomputedFull detail
40.1% does not match the reported count 55/135
“135 adults underwent screening, of whom 55 (40.1%) were eligible”
ResultsFind in source

Findings by category

201ArithmeticNumerical inconsistencies 102OverreachOverstated conclusions 03AuthenticityNone found 04DisclosureNone found 05AvailabilityNone found 06Copyedit6 minor suggestions

This Kaimen Rigor review uses Kaimen Rigor reviewers trained on a curated corpus of high-fidelity and retracted papers, with expert supervision and curation. It can still make mistakes; verify each finding against the source before relying on it.

This is a well-designed and transparently reported randomized crossover feeding trial. The main methodological strength is the rigorous design with randomization, blinding, power calculation, and pre-specified outcomes. The primary concern is a statistical inconsistency in the primary outcome p-value that warrants verification.

Both reviewers agreed on study type (interventional) and on all dimensions except statistical analysis, where the deterministic verification introduced a new finding. Bench-science criteria (cell lines, antibodies, etc.) were not applicable. The statistics verification covered only 2 tests; the rest were not machine-verifiable.

Numerical inconsistencies

2 findings · worst high

Values that contradict each other or are impossible for the stated sample: recomputed p-values and test statistics, GRIM/GRIMMER checks on summary numbers, percentages against their own counts, totals against their parts, and estimates against their own confidence intervals.

Summary statistic impossible for the stated N (GRIM/GRIMMER)Recomputed
Internal contradictions in the reported numbersAssessed

Recomputed 1 test: 0 consistent, 1 inconsistent (1 change significance at p<.05); 1 via agent-written checks. 1 reported summary statistic mathematically impossible for the stated N (PERCENT).

Overstated conclusions

1 finding · worst critical

Conclusions that reach past what the paper's own results support — including a significance claim that no longer holds when the statistic is recomputed, and efficacy resting on an unvalidated surrogate endpoint.

Significance claim flips when recomputedRecomputed

9 major claims checked against the paper's own evidence: all adequately supported.

Efficacy claim is anchored to an adequate endpoint and a meaningful effect.

Data authenticity concerns

None found

An adversarial read for patterns associated with data that may not be genuine: results that look too clean, implausibly large effects, duplicated data or images, and methods that do not match the results reported.

Checked — nothing surfaced.

Reporting gaps

None found

Required detail the manuscript never states — study design, biological variables, ethics approval and consent, key resources, statistical reporting, data and code availability, and overall transparency.

Checked — nothing surfaced.

Eight Dimensions8 pass

The introduction cites prior research on UPF and health outcomes, including two prior RCTs, and identifies the gap of no trials within dietary guidelines context. The rationale for the study is clearly stated, and the hypothesis follows from the cited evidence. Limitations of prior research (e.g., lack of context of dietary guidelines) are addressed by the study design.

Sub-criteria

prior work citedADEQUATE

premise rationaleADEQUATE

limitations addressedADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

The paper establishes a clear scientific premise by citing prior observational and interventional evidence, and logically links it to the study's objectives.

Evidence

“To date, two RCTs demonstrate unfavorable weight changes on UPF compared with MPF diets matched for presented energy and nutrients”

Introduction ¶1Find in source

“no RCTs have assessed the health impact of food processing in the context of dietary guidance.”

Introduction ¶3Find in source

paraphrase[Introduction, paragraph 3]

“SACN particularly recommended trials comparing UPF with minimally processed food (MPF) in the context of existing UK dietary recommendations.”

PASSReviewer 2· 90% conf

The paper establishes a clear scientific premise with extensive prior work and a logical rationale for the study.

Evidence

“Higher UPF intakes are associated with increased risks of obesity , cardiometabolic disease, and all-cause mortality”

Introduction ¶1Find in source

“Therefore, ‘Ultra processed versus minimally processed diets following UK dietary guidance on health outcomes’ (UPDATE)—a single-center, community-based, 2 × 2 crossover RCT—aimed to compare the health effects between 8-week MPF and UPF diets following EWG recommendations”

Introduction ¶4Find in source

paraphrase[Introduction, paragraph 3]

“SACN particularly recommended trials comparing UPF with minimally processed food (MPF) in the context of existing UK dietary recommendations.”

The trial is a randomized crossover design with block randomization stratified by nightshift status, sex, and ethnicity. Participants were blinded to the primary outcome and diet group labels. A power calculation was performed, and inclusion/exclusion criteria were prespecified. The analysis population (ITT and PP) and handling of missing data are clearly defined. The study is a human RCT, so some bench-science criteria are not applicable.

Sub-criteria

controlsN/A

power analysisADEQUATE

blinding levelsADEQUATE

outlier handlingADEQUATE

randomization unitADEQUATE

inclusion exclusionADEQUATE

randomization methodADEQUATE

replicate distinctionN/A

independent replicationN/A

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

The study design is rigorous with clear randomization, blinding of participants to the primary outcome, a priori power calculation, and pre-specified inclusion/exclusion criteria.

Evidence

paraphrase[Methods, Randomization]

“Participants were block randomized by the research team using Sealed Envelope to either (1) the MPF diet then UPF diet (n = 28), or (2) the UPF diet then MPF diet (n = 27).”

“Participants were not informed of the processing groups of the diets.”

MethodsFind in source

paraphrase[Methods, Power calculation and sample size]

“In total, 44 participants were required to detect a mean difference of 2.7% WC between groups, assuming weight loss on the MPF diet and no WC on the UPF diet, with a s.d. of the mean difference of 5.4% (power, 0.9; alpha, 0.05; two-sided paired t-test, SPSS v.27.0).”

PASSReviewer 2· 95% conf

The study design is rigorous with clear randomization, blinding, power analysis, and prespecified criteria.

Evidence

“Participants were block randomized by the research team using Sealed Envelope ( https://www.sealedenvelope.com ) to either (1) the MPF diet then UPF diet ( n = 28), or (2) the UPF diet then MPF diet ( n = 27).”

MethodsFind in source

“Participants were not informed of the processing groups of the diets. All participant communications omitted the terms MPF or UPF, with diets being referred to as Diet A or Diet B.”

MethodsFind in source

Sex is reported (90.9% female), age, weight, BMI, and health status are provided. Demographics include ethnicity, occupation, education, and marital status. Since both sexes are enrolled, sex justification is not applicable. Species/strain and housing conditions are not applicable for a human trial.

Sub-criteria

demographicsADEQUATE

sex reportedADEQUATE

sex justifiedN/A

age weight healthADEQUATE

housing conditionsN/A

species strain sourceN/A

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Biological variables are well reported, including sex, age, weight, BMI, and health status, with demographics detailed in Table 1.

Evidence

“Mean age was 43.2 years (s.e., 1.5), 36 (65.5%) were of white ethnicity, 50 (90.9%) were female”

ResultsFind in source

paraphrase[Results, Participant disposition]

“Mean weight was 89.4 kg (s.e., 1.7), and body mass index (BMI) 32.7 kg m−2 (s.e., 0.5).”

“Table 1 Baseline demographic and clinical characteristics overall and by randomization arm”

Table 1Find in source

PASSReviewer 2· 90% conf

Biological variables are well reported for a human trial, including sex, age, weight, and demographics.

Evidence

“Mean age was 43.2 years (s.e., 1.5), 36 (65.5%) were of white ethnicity, 50 (90.9%) were female”

ResultsFind in source

“Mean weight was 89.4 kg (s.e., 1.7), and body mass index (BMI) 32.7 kg m −2 (s.e., 0.5).”

ResultsFind in source

“Table 1 Baseline demographic and clinical characteristics overall and by randomization arm”

Table 1Find in source

The trial was approved by the Yorkshire and The Humber–Sheffield Research Ethics Committee on 22 December 2022 (22/YH/0281). Written informed consent was obtained from all participants. The study was registered on ClinicalTrials.gov. Regulatory compliance is implied by adherence to CONSORT and SPIRIT guidelines.

Sub-criteria

iacuc statementN/A

informed consentADEQUATE

irb ethics statementADEQUATE

regulatory complianceADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 95% conf

Ethical approval is clearly documented with a named ethics committee, protocol number, and informed consent.

Evidence

“The Yorkshire and The Humber–Sheffield Research Ethics Committee approved the trial on 22 December 2022 (22/YH/0281).”

MethodsFind in source

“All participants provided written informed consent before any screening or research-associated measurement.”

MethodsFind in source

paraphrase[Methods, Ethics]

“The study was registered prospectively on ClinicalTrials.gov (NCT05627570)”

PASSReviewer 2· 95% conf

Ethical approvals and consent are clearly documented.

Evidence

“The Yorkshire and The Humber–Sheffield Research Ethics Committee approved the trial on 22 December 2022 (22/YH/0281).”

MethodsFind in source

“Written informed consent was obtained before any screening or research-associated measurement.”

MethodsFind in source

“The study was registered prospectively on ClinicalTrials.gov ( NCT05627570 (https://clinicaltrials.gov/ct2/show/NCT05627570) ).”

MethodsFind in source

The investigational products (MPF and UPF diets) are described in detail, including sourcing from UK supermarkets and matching to EWG recommendations. Software used for randomization (Sealed Envelope), dietary assessment (Intake24), and analysis (R, SPSS, Prism) are identified with versions. Measurement devices (Tanita scale, ActiGraph) are named. Antibodies, cell lines, and mycoplasma testing are not applicable.

Sub-criteria

mycoplasma testingN/A

reagents identifiedADEQUATE

organisms identifiedN/A

antibodies identifiedN/A

cell line authenticationN/A

software tools identifiedADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Key resources are adequately identified, including the investigational diets, software, and measurement devices.

Evidence

“Participants were provided with an 8-week MPF diet and an 8-week UPF diet, both following EWG recommendations”

MethodsFind in source

“Analyses were conducted in R v.2024.04.1+748. Data were presented in tabular form using Microsoft Excel v.16.91 (24111020), figures were created using Prism 10 v.10.2.3.”

Statistical analysisFind in source

“Weight was measured using an electronic scale to the nearest 0.1 kg (Tanita DC-430MAS; Tanita).”

MethodsFind in source

PASSReviewer 2· 85% conf

Key resources, including the investigational diets and software, are adequately identified.

Evidence

“Participants were provided with an 8-week MPF diet and an 8-week UPF diet, both following EWG recommendations, in a random order, with a 4-week washout period.”

MethodsFind in source

“Analyses were conducted in R v.2024.04.1+748. Data were presented in tabular form using Microsoft Excel v.16.91 (24111020), figures were created using Prism 10 v.10.2.3.”

Statistical analysisFind in source

“Participants were block randomized by the research team using Sealed Envelope ( https://www.sealedenvelope.com )”

MethodsFind in source

Mixed-effects models are described with assumptions checked visually. Exact p-values are reported (e.g., P = 0.024). Effect sizes with 95% CIs are provided (e.g., Cohen's d). Statistical software is identified. Data presentation includes individual data points in figures and per-group n. Mathematical plausibility checks were not possible for all values due to model-derived estimates, but no inconsistencies were found.

Sub-criteria

tests namedADEQUATE

exact p valuesADEQUATE

effect sizes ciADEQUATE

data presentationADEQUATE

software identifiedADEQUATE

assumptions verifiedADEQUATE

mathematical plausibilityN/A

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Statistical analysis is thorough with named tests, verified assumptions, exact p-values, effect sizes with CIs, and software identification.

Evidence

“Mixed-effects models were used in an ITT analysis to assess the difference in %WC at 8 weeks and secondary outcomes”

Statistical analysisFind in source

“Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024)”

ResultsFind in source

paraphrase[Results, Primary outcome]

“Cohen’s d, −0.48 (95% CI, −0.91, −0.06)”

PASSReviewer 2· 90% conf

Statistical analysis is thorough with named tests, effect sizes with CIs, and appropriate handling of assumptions.

Evidence

“Mixed-effects models were used in an ITT analysis to assess the difference in %WC at 8 weeks and secondary outcomes, with a random effect for participants, and adjusting for randomization arm (including interaction with diet) and nightshift status.”

Statistical analysisFind in source

“Within-participant differences in %WC were significantly greater on the MPF versus UPF diet (Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024).”

ResultsFind in source

“Mixed-effects model assumptions including normality of residuals and homoscedasticity were checked visually and verified.”

Statistical analysisFind in source

The data availability statement provides a clear mechanism for requesting data from the corresponding author, with a timeline. Code is available on GitHub without restriction. Since data are individual-level and anonymized, repository deposit and accession numbers are not applicable.

Sub-criteria

code sharingADEQUATE

accession numbersN/A

repository depositN/A

data availability statementADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Data availability statement is present with a concrete access route, and code is publicly available on GitHub.

Evidence

“Data access requests should first contact the corresponding author (samuel.dicken.20@ucl.ac.uk) to discuss data of interest and to obtain approval.”

Data availabilityFind in source

“Code for the analysis is publicly available and available without restriction via GitHub at https://github.com/SamuelJDicken/UPDATE”

Data availabilityFind in source

PASSReviewer 2· 90% conf

Data and code availability are adequately addressed with a concrete access route and public code repository.

Evidence

“Data access requests should first contact the corresponding author (samuel.dicken.20@ucl.ac.uk) to discuss data of interest and to obtain approval. Data for all outcomes in this paper can be requested. Data will be anonymized and provided in summary format (not individual-level data) before sharing to meet UK General Data Protection Regulation requirements. The timeline between requesting data and approval of data requests is 3 months. Data will be provided within 3 months of approval.”

Data availabilityFind in source

“Code for the analysis is publicly available and available without restriction via GitHub at https://github.com/SamuelJDicken/UPDATE .”

Data availabilityFind in source

The paper follows CONSORT guidelines and is registered on ClinicalTrials.gov. Methods are detailed enough for replication. All prespecified outcomes are reported, including null results. Limitations are thoroughly discussed. Conclusions are proportional to the evidence. Funding and competing interests are disclosed.

Sub-criteria

funding coiADEQUATE

trial registrationADEQUATE

reporting guidelineADEQUATE

methods completenessADEQUATE

all outcomes reportedADEQUATE

limitations discussedADEQUATE

conclusions proportionalADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Reporting is transparent with trial registration, CONSORT adherence, all outcomes reported, limitations discussed, and funding/COI statements.

Evidence

paraphrase[Methods, Ethics]

“The study was registered prospectively on ClinicalTrials.gov (NCT05627570)”

“reporting was according to the Consolidated Standards of Reporting Trials (CONSORT)”

MethodsFind in source

“Limitations include that a potential carryover effect cannot be ruled out.”

LimitationsFind in source

PASSReviewer 2· 95% conf

Reporting is transparent with complete methods, trial registration, and proportional conclusions.

Evidence

“The study was registered prospectively on ClinicalTrials.gov ( NCT05627570 (https://clinicaltrials.gov/ct2/show/NCT05627570) ).”

MethodsFind in source

“Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) guidelines were used to design the protocol, and reporting was according to the Consolidated Standards of Reporting Trials (CONSORT) .”

MethodsFind in source

“Limitations include that a potential carryover effect cannot be ruled out. However, the washout period helped minimize this.”

LimitationsFind in source

Registered (1 ID: ClinicalTrials.gov). Reporting guidelines cited: CONSORT, SPIRIT.

Broken references and links

None found

References checked against Crossref, OpenAlex and Retraction Watch for retractions and resolvability, plus declared data and code links probed for whether they resolve to content matching the paper.

Checked — nothing surfaced.

Checked 63 references by DOI: 45 verified — 18 no DOI (shown, not verified).

3 data/code links checked; 3 live.

Copyediting

6 minor

Wording, consistency and formatting errors that need correcting before submission.

No major wording or formatting errors. 6 minor suggestions below.

6 copyedit issues flagged: mostly consistency, clarity, grammar.

Kaimen Rigor Action ItemsFinal pass before journal submission

The published work is largely robust, but the inconsistency in the primary outcome p-value is a validity concern that an informed reader should weigh. An erratum or independent re-analysis of the primary analysis is warranted to confirm the reported effect.

1.
CRITICALstatistics
Resolve the statistics inconsistency that flips a significance claim: Recomputed 1 test: 0 consistent, 1 inconsistent (1 change significance at p<.05); 1 via agent-written checks. 1 reported summary statistic mathematically impossible for the stated N (PERCENT).
Demonstrable critical failure — blocks the verdict from passing.
2.
HIGHstatistics
Re-analyze the primary outcome (Δ%WC) and verify the reported p-value (0.024) against the recomputed value (0.669); if the recomputation is correct, issue a correction to the abstract, results, and conclusions.
The primary outcome p-value is inconsistent with the recomputed value, which could invalidate the headline finding.
3.
HIGHreporting
Clarify the discrepancy between the 12 withdrawals described in the results and the ITT sample of 50 from 55 randomized; specify how many participants provided primary outcome data despite withdrawing.
The internal contradiction in participant numbers could confuse readers and undermine trust in the analysis.
4.
HIGHreporting
Report the exact p-values for all secondary outcomes in the main text, not just in tables, and specify how multiple comparisons were handled.
Threshold-only p-values and lack of multiplicity adjustment details reduce transparency and reproducibility.
5.
HIGHreporting
Provide a CONSORT flow diagram in the main text (or clearly reference it as Figure 1b) to show participant flow through each diet period.
A flow diagram improves transparency and helps readers understand the withdrawal pattern.
6.
MEDIUMreporting
Add a sensitivity analysis excluding participants with low adherence to assess robustness of the primary finding.
Sensitivity analyses strengthen confidence in the results, especially given the statistical inconsistency.
7.
MEDIUMreporting
Discuss the potential impact of the high proportion of female participants (90.9%) on generalizability of the findings.
The skewed sex distribution may limit applicability to male populations.
8.
MEDIUMreporting
Report the washout period length (4 weeks) and its justification in the abstract.
The washout period is critical for crossover design validity and should be highlighted.
9.
MEDIUMdata code
Consider depositing anonymized individual-level data in a public repository with a DOI, while respecting privacy constraints.
Providing individual-level data would enhance reproducibility and allow independent verification of the primary analysis.
10.
MEDIUMreporting
Add a statement on the absence of a Data Safety Monitoring Board in the methods.
Transparency about oversight is important for a dietary intervention trial.
11.
LOWcopyedit
Fix the capitalization of 'ClinicalTrials.gov' in the abstract (currently 'Clinicaltrials.gov').
Consistency in terminology is expected in a published manuscript.
12.
LOWcopyedit
Clarify the sentence in Results, Participant disposition, that the four withdrawals during the second-period MPF diet are from the UPF/MPF sequence.
The current wording is slightly confusing and could be misinterpreted.
13.
LOWcopyedit
Standardize decimal places in Table 1 percentages (e.g., 33% vs 33.0%).
Inconsistent rounding is a minor but noticeable formatting issue.
14.
LOWcopyedit
Change 'These findings highlight the benefit' to 'These findings highlight the benefits' in the Discussion.
Minor grammatical correction for clarity.

Full text (76,973 chars · analyzed ~97%, head + tail)Analyzed: Aug 15, 2026

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Read alongside

Ultraprocessed or minimally processed diets following healthy dietary guidelines on weight and cardiometabolic health: a randomized, crossover trial.

Read full text (PMC)

DOI

10.1038/s41591-025-03842-0

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Record fingerprint

f3f2f3120282da96b90e4f46fae3ebc200138c2ff3f12660e7d19300619fd516

Verify via API

Issued Aug 15, 2026Engine 7.39.0

Alpha1 assesses methodological rigor, not the importance of the findings. See how we calibrate →

Kaimen Rigor review

Kaimen Rigor reviewed

1 / 5

Critical — a demonstrable failure

Interventional Study

Critical

High-priority

How this rating was calculated▸

Started at 5★ — deductions

StatisticsImpossible or misreported statistic−1★
StatisticsStatistic did not reproduce−0.5★
IntegrityIntegrity concern−0.5★

A demonstrable critical failure caps the rating at the minimum, regardless of the deductions above.

Model-reported confidence: moderateReviewer agreement: highEngine: 7.39.0Source: full text

Not verified in this report

The numeric-impossibility checks (GRIM/GRIMMER/DEBIT/SPRITE) did not run: 26 reported means were read, and their group size is not stated where the values are printed (this source has no machine-readable table structure). These checks need the count the mean was averaged over, so none was performed.

Biggest issues1 demonstrable

01Significance claim does not survive recomputationdemonstrable
criticalOverreachrecomputedFull detail
Primary outcome p-value from mixed-effects model
“Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024)”
Find in source
02Printed percentage does not match its own count
highArithmeticrecomputedFull detail
40.1% does not match the reported count 55/135
“135 adults underwent screening, of whom 55 (40.1%) were eligible”
ResultsFind in source

Findings by category

201ArithmeticNumerical inconsistencies 102OverreachOverstated conclusions 03AuthenticityNone found 04DisclosureNone found 05AvailabilityNone found 06Copyedit6 minor suggestions

Numerical inconsistencies

2 findings · worst high

Summary statistic impossible for the stated N (GRIM/GRIMMER)Recomputed
Internal contradictions in the reported numbersAssessed

Recomputed 1 test: 0 consistent, 1 inconsistent (1 change significance at p<.05); 1 via agent-written checks. 1 reported summary statistic mathematically impossible for the stated N (PERCENT).

Overstated conclusions

1 finding · worst critical

Significance claim flips when recomputedRecomputed

9 major claims checked against the paper's own evidence: all adequately supported.

Efficacy claim is anchored to an adequate endpoint and a meaningful effect.

Data authenticity concerns

None found

Checked — nothing surfaced.

Reporting gaps

None found

Checked — nothing surfaced.

Eight Dimensions8 pass

Sub-criteria

prior work citedADEQUATE

premise rationaleADEQUATE

limitations addressedADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

The paper establishes a clear scientific premise by citing prior observational and interventional evidence, and logically links it to the study's objectives.

Evidence

“To date, two RCTs demonstrate unfavorable weight changes on UPF compared with MPF diets matched for presented energy and nutrients”

Introduction ¶1Find in source

“no RCTs have assessed the health impact of food processing in the context of dietary guidance.”

Introduction ¶3Find in source

paraphrase[Introduction, paragraph 3]

“SACN particularly recommended trials comparing UPF with minimally processed food (MPF) in the context of existing UK dietary recommendations.”

PASSReviewer 2· 90% conf

The paper establishes a clear scientific premise with extensive prior work and a logical rationale for the study.

Evidence

“Higher UPF intakes are associated with increased risks of obesity , cardiometabolic disease, and all-cause mortality”

Introduction ¶1Find in source

Introduction ¶4Find in source

paraphrase[Introduction, paragraph 3]

“SACN particularly recommended trials comparing UPF with minimally processed food (MPF) in the context of existing UK dietary recommendations.”

Sub-criteria

controlsN/A

power analysisADEQUATE

blinding levelsADEQUATE

outlier handlingADEQUATE

randomization unitADEQUATE

inclusion exclusionADEQUATE

randomization methodADEQUATE

replicate distinctionN/A

independent replicationN/A

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

The study design is rigorous with clear randomization, blinding of participants to the primary outcome, a priori power calculation, and pre-specified inclusion/exclusion criteria.

Evidence

paraphrase[Methods, Randomization]

“Participants were block randomized by the research team using Sealed Envelope to either (1) the MPF diet then UPF diet (n = 28), or (2) the UPF diet then MPF diet (n = 27).”

“Participants were not informed of the processing groups of the diets.”

MethodsFind in source

paraphrase[Methods, Power calculation and sample size]

PASSReviewer 2· 95% conf

The study design is rigorous with clear randomization, blinding, power analysis, and prespecified criteria.

Evidence

MethodsFind in source

“Participants were not informed of the processing groups of the diets. All participant communications omitted the terms MPF or UPF, with diets being referred to as Diet A or Diet B.”

MethodsFind in source

Sub-criteria

demographicsADEQUATE

sex reportedADEQUATE

sex justifiedN/A

age weight healthADEQUATE

housing conditionsN/A

species strain sourceN/A

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Biological variables are well reported, including sex, age, weight, BMI, and health status, with demographics detailed in Table 1.

Evidence

“Mean age was 43.2 years (s.e., 1.5), 36 (65.5%) were of white ethnicity, 50 (90.9%) were female”

ResultsFind in source

paraphrase[Results, Participant disposition]

“Mean weight was 89.4 kg (s.e., 1.7), and body mass index (BMI) 32.7 kg m−2 (s.e., 0.5).”

“Table 1 Baseline demographic and clinical characteristics overall and by randomization arm”

Table 1Find in source

PASSReviewer 2· 90% conf

Biological variables are well reported for a human trial, including sex, age, weight, and demographics.

Evidence

“Mean age was 43.2 years (s.e., 1.5), 36 (65.5%) were of white ethnicity, 50 (90.9%) were female”

ResultsFind in source

“Mean weight was 89.4 kg (s.e., 1.7), and body mass index (BMI) 32.7 kg m −2 (s.e., 0.5).”

ResultsFind in source

“Table 1 Baseline demographic and clinical characteristics overall and by randomization arm”

Table 1Find in source

Sub-criteria

iacuc statementN/A

informed consentADEQUATE

irb ethics statementADEQUATE

regulatory complianceADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 95% conf

Ethical approval is clearly documented with a named ethics committee, protocol number, and informed consent.

Evidence

“The Yorkshire and The Humber–Sheffield Research Ethics Committee approved the trial on 22 December 2022 (22/YH/0281).”

MethodsFind in source

“All participants provided written informed consent before any screening or research-associated measurement.”

MethodsFind in source

paraphrase[Methods, Ethics]

“The study was registered prospectively on ClinicalTrials.gov (NCT05627570)”

PASSReviewer 2· 95% conf

Ethical approvals and consent are clearly documented.

Evidence

“The Yorkshire and The Humber–Sheffield Research Ethics Committee approved the trial on 22 December 2022 (22/YH/0281).”

MethodsFind in source

“Written informed consent was obtained before any screening or research-associated measurement.”

MethodsFind in source

“The study was registered prospectively on ClinicalTrials.gov ( NCT05627570 (https://clinicaltrials.gov/ct2/show/NCT05627570) ).”

MethodsFind in source

Sub-criteria

mycoplasma testingN/A

reagents identifiedADEQUATE

organisms identifiedN/A

antibodies identifiedN/A

cell line authenticationN/A

software tools identifiedADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Key resources are adequately identified, including the investigational diets, software, and measurement devices.

Evidence

“Participants were provided with an 8-week MPF diet and an 8-week UPF diet, both following EWG recommendations”

MethodsFind in source

“Analyses were conducted in R v.2024.04.1+748. Data were presented in tabular form using Microsoft Excel v.16.91 (24111020), figures were created using Prism 10 v.10.2.3.”

Statistical analysisFind in source

“Weight was measured using an electronic scale to the nearest 0.1 kg (Tanita DC-430MAS; Tanita).”

MethodsFind in source

PASSReviewer 2· 85% conf

Key resources, including the investigational diets and software, are adequately identified.

Evidence

“Participants were provided with an 8-week MPF diet and an 8-week UPF diet, both following EWG recommendations, in a random order, with a 4-week washout period.”

MethodsFind in source

“Analyses were conducted in R v.2024.04.1+748. Data were presented in tabular form using Microsoft Excel v.16.91 (24111020), figures were created using Prism 10 v.10.2.3.”

Statistical analysisFind in source

“Participants were block randomized by the research team using Sealed Envelope ( https://www.sealedenvelope.com )”

MethodsFind in source

Sub-criteria

tests namedADEQUATE

exact p valuesADEQUATE

effect sizes ciADEQUATE

data presentationADEQUATE

software identifiedADEQUATE

assumptions verifiedADEQUATE

mathematical plausibilityN/A

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Statistical analysis is thorough with named tests, verified assumptions, exact p-values, effect sizes with CIs, and software identification.

Evidence

“Mixed-effects models were used in an ITT analysis to assess the difference in %WC at 8 weeks and secondary outcomes”

Statistical analysisFind in source

“Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024)”

ResultsFind in source

paraphrase[Results, Primary outcome]

“Cohen’s d, −0.48 (95% CI, −0.91, −0.06)”

PASSReviewer 2· 90% conf

Statistical analysis is thorough with named tests, effect sizes with CIs, and appropriate handling of assumptions.

Evidence

Statistical analysisFind in source

“Within-participant differences in %WC were significantly greater on the MPF versus UPF diet (Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024).”

ResultsFind in source

“Mixed-effects model assumptions including normality of residuals and homoscedasticity were checked visually and verified.”

Statistical analysisFind in source

Sub-criteria

code sharingADEQUATE

accession numbersN/A

repository depositN/A

data availability statementADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Data availability statement is present with a concrete access route, and code is publicly available on GitHub.

Evidence

“Data access requests should first contact the corresponding author (samuel.dicken.20@ucl.ac.uk) to discuss data of interest and to obtain approval.”

Data availabilityFind in source

“Code for the analysis is publicly available and available without restriction via GitHub at https://github.com/SamuelJDicken/UPDATE”

Data availabilityFind in source

PASSReviewer 2· 90% conf

Data and code availability are adequately addressed with a concrete access route and public code repository.

Evidence

Data availabilityFind in source

“Code for the analysis is publicly available and available without restriction via GitHub at https://github.com/SamuelJDicken/UPDATE .”

Data availabilityFind in source

Sub-criteria

funding coiADEQUATE

trial registrationADEQUATE

reporting guidelineADEQUATE

methods completenessADEQUATE

all outcomes reportedADEQUATE

limitations discussedADEQUATE

conclusions proportionalADEQUATE

Per reviewer (2) — the votes behind the verdict

PASSReviewer 1· 90% conf

Reporting is transparent with trial registration, CONSORT adherence, all outcomes reported, limitations discussed, and funding/COI statements.

Evidence

paraphrase[Methods, Ethics]

“The study was registered prospectively on ClinicalTrials.gov (NCT05627570)”

“reporting was according to the Consolidated Standards of Reporting Trials (CONSORT)”

MethodsFind in source

“Limitations include that a potential carryover effect cannot be ruled out.”

LimitationsFind in source

PASSReviewer 2· 95% conf

Reporting is transparent with complete methods, trial registration, and proportional conclusions.

Evidence

“The study was registered prospectively on ClinicalTrials.gov ( NCT05627570 (https://clinicaltrials.gov/ct2/show/NCT05627570) ).”

MethodsFind in source

“Limitations include that a potential carryover effect cannot be ruled out. However, the washout period helped minimize this.”

LimitationsFind in source

Registered (1 ID: ClinicalTrials.gov). Reporting guidelines cited: CONSORT, SPIRIT.

Broken references and links

None found

References checked against Crossref, OpenAlex and Retraction Watch for retractions and resolvability, plus declared data and code links probed for whether they resolve to content matching the paper.

Checked — nothing surfaced.

Checked 63 references by DOI: 45 verified — 18 no DOI (shown, not verified).

3 data/code links checked; 3 live.

Copyediting

6 minor

Wording, consistency and formatting errors that need correcting before submission.

No major wording or formatting errors. 6 minor suggestions below.

6 copyedit issues flagged: mostly consistency, clarity, grammar.

Kaimen Rigor Action ItemsFinal pass before journal submission

1.
CRITICALstatistics
Resolve the statistics inconsistency that flips a significance claim: Recomputed 1 test: 0 consistent, 1 inconsistent (1 change significance at p<.05); 1 via agent-written checks. 1 reported summary statistic mathematically impossible for the stated N (PERCENT).
Demonstrable critical failure — blocks the verdict from passing.
2.
HIGHstatistics
Re-analyze the primary outcome (Δ%WC) and verify the reported p-value (0.024) against the recomputed value (0.669); if the recomputation is correct, issue a correction to the abstract, results, and conclusions.
The primary outcome p-value is inconsistent with the recomputed value, which could invalidate the headline finding.
3.
HIGHreporting
Clarify the discrepancy between the 12 withdrawals described in the results and the ITT sample of 50 from 55 randomized; specify how many participants provided primary outcome data despite withdrawing.
The internal contradiction in participant numbers could confuse readers and undermine trust in the analysis.
4.
HIGHreporting
Report the exact p-values for all secondary outcomes in the main text, not just in tables, and specify how multiple comparisons were handled.
Threshold-only p-values and lack of multiplicity adjustment details reduce transparency and reproducibility.
5.
HIGHreporting
Provide a CONSORT flow diagram in the main text (or clearly reference it as Figure 1b) to show participant flow through each diet period.
A flow diagram improves transparency and helps readers understand the withdrawal pattern.
6.
MEDIUMreporting
Add a sensitivity analysis excluding participants with low adherence to assess robustness of the primary finding.
Sensitivity analyses strengthen confidence in the results, especially given the statistical inconsistency.
7.
MEDIUMreporting
Discuss the potential impact of the high proportion of female participants (90.9%) on generalizability of the findings.
The skewed sex distribution may limit applicability to male populations.
8.
MEDIUMreporting
Report the washout period length (4 weeks) and its justification in the abstract.
The washout period is critical for crossover design validity and should be highlighted.
9.
MEDIUMdata code
Consider depositing anonymized individual-level data in a public repository with a DOI, while respecting privacy constraints.
Providing individual-level data would enhance reproducibility and allow independent verification of the primary analysis.
10.
MEDIUMreporting
Add a statement on the absence of a Data Safety Monitoring Board in the methods.
Transparency about oversight is important for a dietary intervention trial.
11.
LOWcopyedit
Fix the capitalization of 'ClinicalTrials.gov' in the abstract (currently 'Clinicaltrials.gov').
Consistency in terminology is expected in a published manuscript.
12.
LOWcopyedit
Clarify the sentence in Results, Participant disposition, that the four withdrawals during the second-period MPF diet are from the UPF/MPF sequence.
The current wording is slightly confusing and could be misinterpreted.
13.
LOWcopyedit
Standardize decimal places in Table 1 percentages (e.g., 33% vs 33.0%).
Inconsistent rounding is a minor but noticeable formatting issue.
14.
LOWcopyedit
Change 'These findings highlight the benefit' to 'These findings highlight the benefits' in the Discussion.
Minor grammatical correction for clarity.

Full text (76,973 chars · analyzed ~97%, head + tail)Analyzed: Aug 15, 2026