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Kaimen Rigor review

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

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.

DOI: 10.1038/s41591-025-03842-0
Record issued: 2026-08-10
Engine: 7.29.0
Exported: 2026-09-22

Prepared by Alpha1. This document is confidential: it is intended for the recipient it was shared with and must not be redistributed. The live record at alpha1science.com/verify/23463ec4-1605-4186-8a70-be8feb617291 is authoritative.

Kaimen Rigor review

Kaimen Rigor reviewed

3 / 5

Adequate — real issues to address

Interventional Study

Critical

High-priority

How this rating was calculated

Started at 5★ — deductions

IntegrityIntegrity concern ×2−1★
ClaimsOverstated claim−0.5★
ReportingEthical approvals partially met−0.25★
ReportingKey resources partially met−0.25★

Model-reported confidence: moderateReviewer agreement: moderateEngine: 7.29.0Source: full text

Not verified in this report

References were not verified against Crossref/OpenAlex.

Biggest issues

01Conclusion reaches beyond the evidence
mediumOverreachreviewer-assessedFull detail
The MPF diet conferred greater cardiometabolic improvements than the UPF diet.
“the greater weight and fat mass reductions on the MPF compared with the UPF diet did not translate into significant improvements in cardiometabolic risk factors over the UPF diet, except triglycerides.”
DiscussionFind in source

Findings by category

101ArithmeticNumerical inconsistencies 202OverreachOverstated conclusions · partly checked 103AuthenticityData authenticity concerns 204DisclosureReporting gaps 05AvailabilityNone found 06Copyedit5 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 crossover RCT comparing MPF vs UPF diets within UK dietary guidance. The main methodological strengths are rigorous randomization/blinding, a priori power analysis, comprehensive demographic reporting, prospective registration, and a concrete data/code availability statement. The weaknesses are minor reporting gaps: no explicit Declaration of Helsinki statement, a small arithmetic discrepancy in the eligibility percentage, an internally inconsistent interaction p-value, and a slightly overstated cardiometabolic conclusion.

All three reviewers converged on pass for scientific premise, study design, biological variables, data code availability, and reporting transparency, and on warn for ethical approvals. They diverged on key resources (N/A vs warn vs pass; synthesized to pass) and statistical analysis (warn vs pass; synthesized to warn due to the verifiable percentage error). The statistics component recomputed only 3 reported tests (2 consistent, 0 inconsistent); most p-values were threshold-only or model-derived and could not be machine-verified, so the statistics are not confirmed as a whole. The claim audit flagged one overstated conclusion.

Numerical inconsistencies

1 finding · worst low

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.

Internal contradictions in the reported numbersAssessed

Recomputed 2 tests: 2 consistent, 0 inconsistent; 2 via agent-written checks.

Agent-written checks— recomputed from reported CIs / ratios by code the agent wrote

CONSISTENTreported p = .024 · recomputed p = .023Reviewers 1, 2
Primary outcome: within-participant difference in %WC between MPF and UPF diets (two-sided t-test, df 46.1)
“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).”
Find in source
Taken as given: the two-sided t statistic has 46.1 degrees of freedom as stated in the Fig. 2 caption; t = mean difference / standard error = 1.01 / 0.43; the test is two-tailed
Method: Two-tailed t-test p computed as 2*(1-tCdf(t, df)) with t = 1.01/0.43 and df = 46.1; yields ~0.023, consistent with reported 0.024.
How we recomputed it: 2*(1-tCdf(1.01/0.43, 46.1))
CONSISTENTreported p = .024 · recomputed p = .022Reviewer 1
Primary outcome p cross-checked from estimate and 95% CI
“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).”
Find in source
Taken as given: the 95% CI is two-sided; the estimate -1.01 is the mean within-participant difference in %WC; the CI is on the linear (non-log) scale
Method: p derived from estimate and two-sided 95% CI via normal approximation (z = estimate/SE); yields ~0.021, close to the reported 0.024 (t-based value is the more faithful check).
How we recomputed it: pCI(-1.01, -1.87, -0.14, 0)
UNCOMPUTABLEreported p = .088 · recomputed p = .645Reviewer 2
Fisher's exact test for adverse events by diet (participants with no AE)
“AEs did not differ significantly by diet (P = 0.088)”
Find in source
Taken as given: The 2x2 table is: MPF no AE=14, MPF with AE=36; UPF no AE=11, UPF with AE=39.; The total ITT N=50, and the numbers of participants reporting no AE are 14 and 11 from Table 3.; The test is two-sided Fisher's exact test.; The table cells are counts of participants, not events.
Method: Fisher's exact test (two-sided) on the 2x2 contingency table of participants with/without any adverse event by diet.
How we recomputed it: pFisher2x2(14,36,11,39,0)

lowinternal contradiction
Eligibility percentage inconsistent: 55/135 = 40.7%, but the paper reports 40.1%.
“135 adults underwent screening, of whom 55 (40.1%) were eligible”
ResultsFind in source

Overstated conclusions

2 findings · worst medium

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.

Conclusions overstated beyond the evidenceAssessed
Conclusions only partially backed by the presented evidenceAssessed

12 major claims checked against the paper's own evidence: 1 not fully backed by the presented evidence (unsupported or overstated).

overstatedReviewer 1
The MPF diet conferred greater cardiometabolic improvements than the UPF diet.
Only triglycerides were significantly lower on MPF; LDL-C was significantly lower on UPF, and BP, glucose, lipids and HbA1c mostly did not differ between diets — so a broad 'cardiometabolic improvements' claim outruns the presented evidence.
Evidence: Triglycerides −0.25 mmol/l (P=0.004) favoring MPF; LDL-C 0.25 mmol/l (P=0.016) favoring UPF; no significant between-diet differences in BP, glucose, HbA1c or total/HDL cholesterol.
“the greater weight and fat mass reductions on the MPF compared with the UPF diet did not translate into significant improvements in cardiometabolic risk factors over the UPF diet, except triglycerides.”
DiscussionFind in source
partialReviewer 1
Maintaining the 8-week weight-loss trajectories over 1 year would yield ~9-13% (MPF) and ~4-5% (UPF) weight loss.
This is a speculative extrapolation from 8-week data, explicitly hedged as 'estimated'/'may', so it is presented as a projection rather than an observed result.
Evidence: Model-based extrapolation of 8-week trajectories; no 1-year data collected.
“Maintaining the 8-week weight loss trajectories over 1 year may result in an estimated 9–13% and 4–5% weight loss on MPF and UPF diets, respectively”
DiscussionFind in source
partialReviewer 3
MPF diet leads to greater improvements in craving control and reductions in cravings for savory and sweet compared to UPF diet.
Significant improvements in craving control and craving for savory were observed, but craving for sweet was not significantly different between diets (P=0.055).
Evidence: Table 2: CoEQ craving control 11.68 (P=0.019), craving for savory -10.46 (P=0.015), craving for sweet -6.97 (P=0.055).
“Improvements in CoEQ craving for savory (−10.46 (s.e., 4.12); P = 0.015), difficulty to resist craved nominated food (−13.77 (s.e., 6.35); P = 0.037) and craving control (11.68 (s.e., 4.74); P = 0.019) were significantly greater on the MPF than UPF diet.”
ResultsFind in source
supportedReviewer 1
The MPF diet produced significantly greater percentage weight loss than the UPF diet.
The primary outcome directly supports this with a significant within-participant difference and effect size with CI.
Evidence: Δ%WC −1.01 (95% CI −1.87 to −0.14), P = 0.024; Cohen's d −0.48 (95% CI −0.91 to −0.06).
with significantly greater %WC on MPF (Δ%WC, −1.01 (95% CI, −1.87, −0.14), P = 0.024; Cohen's d , −0.48 (95% CI, −0.91, −0.06))
Abstractreviewer’s wording
supportedReviewer 1
The greater weight loss on the MPF diet was driven by greater reductions in fat mass and total body water mass.
Table 2 shows significantly greater reductions on MPF for fat mass and total body water mass, with no difference in fat-free mass.
Evidence: Fat mass −0.98 kg (s.e. 0.32, P=0.004); total body water mass −0.51 kg (s.e. 0.15, P=0.002); fat-free mass difference 0.00 (P=0.993).
“We observed that the greater weight loss on the MPF diet was through greater reductions in fat mass and total body water mass, with no significant differences in fat-free mass change between diets.”
DiscussionFind in source
supportedReviewer 1
Following UK dietary guidance with a UPF diet resulted in weight loss (not weight gain).
The UPF diet produced significant weight loss within the trial, directly supporting this claim.
Evidence: UPF %WC −1.05 (95% CI −1.98 to −0.13), i.e. significant weight loss from baseline.
“In contrast with our hypothesis given the body of observational evidence linking UPF with weight gain , the UPF diet following UK dietary guidance resulted in weight loss.”
DiscussionFind in source
supportedReviewer 2
Greater weight loss on MPF than UPF diet over 8 weeks.
The primary outcome analysis shows a statistically significant difference in %WC favoring MPF (Δ%WC -1.01%, 95% CI -1.87 to -0.14, P=0.024), supporting this claim.
Evidence: Primary outcome: Δ%WC = -1.01% (95% CI -1.87, -0.14, P=0.024).
“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
supportedReviewer 2
Minimally processed diets lead to weight loss when following UK dietary guidelines.
The MPF diet resulted in significant weight loss from baseline (%WC -2.06%, 95% CI -2.99 to -1.13), supporting this claim.
Evidence: MPF %WC: -2.06% (95% CI -2.99, -1.13).
In the ITT analysis, %WC at 8 weeks was significantly lower on both diets (MPF, −2.06% ((95% confidence interval (CI), −2.99, −1.13); UPF, −1.05% (95% CI, −1.98, −0.13)).
Resultsreviewer’s wording
supportedReviewer 2
Dietary guidance on food processing is needed in addition to existing recommendations.
The finding of greater weight loss on MPF despite both diets meeting UK guidelines supports the need for additional guidance on food processing, as stated in the conclusions.
Evidence: Primary outcome difference and discussion.
“Findings indicate greater weight loss on MPF than UPF diets and needing dietary guidance on food processing in addition to existing recommendations.”
DiscussionFind in source
supportedReviewer 2
Greater fat mass loss on MPF than UPF diet.
The secondary outcome shows a significantly greater reduction in fat mass on MPF (-0.98 kg, P=0.004).
Evidence: Table 2: Fat mass difference -0.98 kg (95% CI -1.62, -0.33, P=0.004).
Reductions in fat mass (−0.98 kg (s.e., 0.32); P = 0.004)... were significantly greater on the MPF compared with UPF diet.
Table 2reviewer’s wording
supportedReviewer 3
MPF diet leads to significantly greater weight loss than UPF diet when following UK dietary guidelines.
The primary outcome analysis shows a statistically significant difference in percent weight change between diets, with MPF resulting in greater loss.
Evidence: Primary outcome: Δ%WC = -1.01% (95% CI -1.87, -0.14; P = 0.024).
“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
supportedReviewer 3
MPF diet leads to greater reductions in fat mass, body fat percentage, visceral fat, and total body water mass compared to UPF diet.
Secondary outcomes show statistically significant differences in these body composition measures favoring MPF.
Evidence: Table 2: Fat mass change -0.98 kg (P=0.004), body fat percentage -0.76% (P=0.010), visceral fat rating -0.41 (P=0.008), total body water mass -0.51 kg (P=0.002).
“Reductions in fat mass (−0.98 kg (s.e., 0.32); P = 0.004), body fat percentage (−0.76% (s.e., 0.28); P = 0.010), visceral fat rating (−0.41 (s.e., 0.15); P = 0.008) and total body water mass (−0.51 kg (s.e., 0.15); P = 0.002) were significantly greater on the MPF compared with UPF diet.”
ResultsFind in source

Data authenticity concerns

1 finding · worst low

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.

Methods and results do not matchAssessed

2 integrity concerns flagged (0 high).

lowmethod result mismatch
The same treatment-by-period interaction is reported with different precision in Results (P < 0.05) and Methods (P < 0.001); both indicate significance, but the inconsistency is a reporting gap.
A significant diet order effect was detected ( P interaction < 0.05 ...) ... This interaction was significant ( P < 0.001)
Statistical analysisreviewer’s wording

Reporting gaps

2 findings · worst medium

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.

Ethics/consent reporting incompleteAssessed
Key resources under-identified (antibodies, cell lines, RRIDs)Assessed

Eight Dimensions6 pass · 2 warn

The paper cites two prior RCTs (Hall et al., Hamano et al.) and observational evidence linking UPF to adverse health outcomes. It explains the gap: no trial has assessed UPF in the context of national dietary guidelines. It directly addresses limitations of prior work (metabolic ward, short duration) by using an 8-week free-living design with diets matched to UK Eatwell Guide recommendations.

Sub-criteria

prior work citedADEQUATE

premise rationaleADEQUATE

limitations addressedADEQUATE

Per reviewer (3) — the votes behind the verdict

PASSReviewer 1· 90% conf

The study clearly establishes its scientific foundation, citing prior observational evidence, two prior metabolic-ward RCTs, and national advisory reports, with a clear rationale for testing food processing within dietary-guideline context.

Evidence

paraphrase[Introduction, paragraph 4]

“To date, two RCTs demonstrate unfavorable weight changes on UPF compared with MPF diets matched for presented energy and nutrients, but no RCTs have assessed the health impact of food processing in the context of dietary guidance.”

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· 95% conf

The paper clearly establishes its scientific foundation by citing prior research, providing a logical rationale, and addressing limitations of prior work.

Evidence

paraphrase[Introduction, paragraph 3]

“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.”

“Strengths of UPDATE include the 8-week duration of each intervention. Diets were matched for UK national dietary guidance, ensuring results are directly relevant for UK public health food policy.”

Discussion ¶2Find in source

PASSReviewer 3· 95% conf

The paper establishes a strong scientific foundation by citing prior research, providing a logical rationale for the study, and discussing limitations of previous work.

Evidence

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

Introduction ¶2Find 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.”

paraphrase[Discussion, paragraph 1]

“In contrast with our hypothesis given the body of observational evidence linking UPF with weight gain, the UPF diet following UK dietary guidance resulted in weight loss.”

Randomization was block-randomized using Sealed Envelope, stratified by nightshift status, sex, and ethnicity. The unit of randomization is the individual participant. Participants were blinded to the primary outcome and diet allocation (Diet A/B); researchers were not blinded, but an independent statistician verified the primary outcome blind. A power calculation was provided (n=44 needed, 55 recruited for 20% dropout). Inclusion/exclusion criteria are detailed. Outlier handling is addressed via ITT and PP analyses and sensitivity analyses with multiple imputation.

Sub-criteria

controlsN/A

power analysisADEQUATE

blinding levelsADEQUATE

outlier handlingADEQUATE

randomization unitADEQUATE

inclusion exclusionADEQUATE

randomization methodADEQUATE

replicate distinctionN/A

independent replicationN/A

Per reviewer (3) — the votes behind the verdict

PASSReviewer 1· 90% conf

Core design elements are well-reported: block randomization with a generated allocation sequence, stratification, participant blinding to the primary outcome, a priori power calculation, and detailed eligibility criteria.

Evidence

paraphrase[Methods, Randomization]

“Participants were block randomized by the research team using Sealed Envelope ... Sealed Envelope generated the random allocation sequence. Randomization was stratified by nightshift status, sex and ethnicity.”

paraphrase[Methods, Power calculation and sample size]

“In total, 44 participants were required to detect a mean difference of 2.7% WC between groups ... (power, 0.9; alpha, 0.05; two-sided paired t -test, SPSS v.27.0).”

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

MethodsFind in source

PASSReviewer 2· 95% conf

The study design is rigorous with adequate randomization, blinding, power analysis, 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. All participant communications omitted the terms MPF or UPF, with diets being referred to as Diet A or Diet B.”

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 3· 95% conf

The study design is rigorous with appropriate randomization, blinding, power analysis, inclusion/exclusion criteria, and missing data handling.

Evidence

paraphrase[Methods, Randomization]

“Participants were block randomized by the research team using Sealed Envelope... Randomization was stratified by nightshift status, sex and ethnicity.”

“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

paraphrase[Methods, Power calculation and sample size]

“In total, 44 participants were required to detect a mean difference of 2.7% WC between groups... with a s.d. of the mean difference of 5.4% (power, 0.9; alpha, 0.05; two-sided paired t-test).”

Sex is reported (90.9% female). Age, weight, BMI, and health status are reported in Table 1. Detailed demographics (ethnicity, occupation, education, marital status, etc.) are provided. Since both sexes are enrolled, sex_justification is not applicable. Species/strain and housing conditions are not applicable for a human study.

Sub-criteria

demographicsADEQUATE

sex reportedADEQUATE

sex justifiedN/A

age weight healthADEQUATE

housing conditionsN/A

species strain sourceN/A

Per reviewer (3) — the votes behind the verdict

PASSReviewer 1· 90% conf

Human demographic and clinical characteristics are thoroughly reported, including sex, age, weight, BMI, ethnicity, comorbidities and medication use.

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

PASSReviewer 2· 95% conf

Biological variables and subject characteristics are well-reported, including sex, age, weight, health status, and detailed demographics.

Evidence

paraphrase[Table 1]

“Female sex 50 (90.9%)”

paraphrase[Table 1]

“Mean age was 43.2 years (s.e., 1.5)... Mean weight was 89.4 kg (s.e., 1.7)... BMI 32.7 kg m−2 (s.e., 0.5).”

paraphrase[Table 1]

“White ethnicity 36 (65.5%)... Occupation... Education level... Marital status...”

PASSReviewer 3· 95% conf

Biological variables (sex, age, weight, health, demographics) are adequately reported for a human trial.

Evidence

“50 (90.9%) were female”

ResultsFind in source

paraphrase[Results, Participant disposition]

“Mean age was 43.2 years (s.e., 1.5)... Mean weight was 89.4 kg (s.e., 1.7)”

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

Table 1Find in source

The paper reports named ethics committee approval (Yorkshire and The Humber–Sheffield Research Ethics Committee, 22/YH/0281) and written informed consent. However, it does not explicitly state adherence to a recognized regulatory framework such as the Declaration of Helsinki or ICH-GCP. The guide requires a named framework for regulatory_compliance to be adequate; mentioning SPIRIT and CONSORT (reporting guidelines) is insufficient.

Sub-criteria

iacuc statementN/A

informed consentADEQUATE

irb ethics statementADEQUATE

regulatory complianceNOT REPORTED

Per reviewer (3) — the votes behind the verdict

WARNReviewer 1· 70% conf

A named research ethics committee approval with protocol number and written informed consent are reported; however, no explicit regulatory-compliance framework (e.g. Declaration of Helsinki, ICH-GCP) is stated by name.

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

absence[Methods, Ethics]

No named regulatory-compliance framework (e.g. Declaration of Helsinki, ICH-GCP) stated

WARNReviewer 2· 90% conf

Ethics approval and informed consent are adequately reported, but regulatory compliance (e.g., Declaration of Helsinki) is not explicitly stated.

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

absence[Methods, Ethics]

Regulatory compliance statement is absent.

WARNReviewer 3· 70% conf

Ethics approval and informed consent are reported, but the paper does not explicitly state compliance with a recognized regulatory framework (e.g., Declaration of Helsinki).

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

absence[Methods, Ethics]

No explicit statement of regulatory compliance.

The diets are the investigational product. The paper describes the MPF diet as 'culinary preparations of individual ingredients' and the UPF diet as sourced from 'leading UK supermarkets', but does not provide specific product names, manufacturers, or batch numbers. Software tools (R, Excel, Prism, ActiGraph) are identified with versions. Other sub-criteria (antibodies, cell lines, mycoplasma, organisms) are not applicable.

Sub-criteria

mycoplasma testingN/A

reagents identifiedINADEQUATE

organisms identifiedN/A

antibodies identifiedN/A

cell line authenticationN/A

software tools identifiedADEQUATE

Per reviewer (3) — the votes behind the verdict

N/AReviewer 1· 75% conf

This is a dietary feeding trial with no drug, biologic, device, or bench reagent; per the applicability guidance, dietary trials with no such investigational product are scored not_applicable for key biological/chemical resources.

Evidence

paraphrase[Methods, Intervention]

“Participants were provided with an 8-week MPF diet and an 8-week UPF diet, both following EWG recommendations, with meals and snacks delivered to their homes.”

WARNReviewer 2· 85% conf

The investigational product (diets) is described but not fully identified with specific manufacturer/source; software tools are adequately identified.

Evidence

“UPF was sourced from leading UK supermarkets and were not culinary preparations, providing a diet representative of UPF available in the UK.”

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

“Meals and snacks on the MPF diet were culinary preparations of individual ingredients (for example, raw meat, vegetables, oats, butter) ensuring correct Nova classification and no ambiguous decision on mixed dishes/shop-bought items.”

MethodsFind in source

PASSReviewer 3· 90% conf

Key resources (investigational diets and software) are adequately identified, and other criteria are not applicable.

Evidence

paraphrase[Methods, Intervention]

“Participants were provided with an 8-week MPF diet and an 8-week UPF diet, both following EWG recommendations... Menus were designed to be representative of UK diets.”

paraphrase[Methods, Statistical analysis]

“Analyses were conducted in R v.2024.04.1+748... figures were created using Prism 10 v.10.2.3.”

paraphrase[Data availability]

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

Mixed-effects models are named as the primary analysis. Assumptions (normality, homoscedasticity) were checked visually. Exact p-values are reported for the primary outcome (P=0.024) and many secondary outcomes. Effect sizes with 95% CIs are reported (Cohen's d, mean differences). Software is identified with versions. Individual data points are shown in Figure 2d,e. Mathematical plausibility is not applicable as the primary outcome is continuous and model-derived.

Sub-criteria

tests namedADEQUATE

exact p valuesADEQUATE

effect sizes ciADEQUATE

data presentationADEQUATE

software identifiedADEQUATE

assumptions verifiedADEQUATE

mathematical plausibilityN/A

Per reviewer (3) — the votes behind the verdict

WARNReviewer 1· 60% conf

Statistical reporting is strong overall — tests named, assumptions checked, exact p-values, effect sizes with CIs, software identified, individual data points shown. A minor, demonstrable arithmetic discrepancy (55/135 reported as 40.1% instead of 40.7%) warrants a warn.

Evidence

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

Statistical analysisFind in source

“Analyses were conducted in R v.2024.04.1+748.”

Statistical analysisFind in source

“135 adults underwent screening, of whom 55 (40.1%) were eligible”

ResultsFind in source

PASSReviewer 2· 95% conf

Statistical analysis is rigorous: tests are named, assumptions verified, exact p-values and effect sizes with CIs reported, software identified, and data presented with individual points.

Evidence

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

Statistical analysisFind in source

paraphrase[Results, Primary outcome]

“Δ%WC, −1.01% (s.e., 0.43; 95% CI, −1.87, −0.14; P = 0.024). Cohen’s d, −0.48 (95% CI, −0.91, −0.06)”

paraphrase[Figure 2 legend]

“d, Unadjusted %WC on the minimally processed diet for each participant. e, Unadjusted %WC on the UPF diet for each participant.”

PASSReviewer 3· 95% conf

Statistical analysis is rigorous with tests named, assumptions verified, exact p-values and effect sizes with CIs reported, software identified, and clear data presentation.

Evidence

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

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

paraphrase[Figure 2 legend]

“d, Unadjusted %WC on the minimally processed diet for each participant. e, Unadjusted %WC on the UPF diet for each participant.”

The data availability statement specifies contacting the corresponding author, with a timeline of 3 months for approval and 3 months for provision. This is a concrete route, though not a named platform. Code is available on GitHub without restriction. Repository deposit is not applicable as patient-level data cannot be deposited in a public repository due to privacy.

Sub-criteria

code sharingADEQUATE

accession numbersN/A

repository depositINADEQUATE

data availability statementADEQUATE

Per reviewer (3) — the votes behind the verdict

PASSReviewer 1· 85% conf

Data availability statement provides a concrete access route with conditions and a timeframe, and analysis code is openly shared on GitHub.

Evidence

paraphrase[Data availability]

“Data access requests should first contact the corresponding author (samuel.dicken.20@ucl.ac.uk) ... The timeline between requesting data and approval of data requests is 3 months.”

“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 availability statement provides a concrete route with conditions and timeframe; code is publicly available on GitHub.

Evidence

paraphrase[Data availability]

“Data access requests should first contact the corresponding author (samuel.dicken.20@ucl.ac.uk) to discuss data of interest and to obtain approval... The timeline between requesting data and approval of data requests is 3 months. Data will be provided within 3 months of approval.”

paraphrase[Code availability]

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

absence[Data availability]

No repository deposit for patient-level data.

PASSReviewer 3· 90% conf

Data availability statement provides a concrete access route, and custom code is shared on GitHub. Repository deposit and accession numbers are not applicable due to patient-level data.

Evidence

paraphrase[Data availability]

“Data access requests should first contact the corresponding author... Data will be provided within 3 months of approval.”

paraphrase[Code availability]

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

Methods are detailed enough for replication. The trial is registered (NCT05627570). CONSORT and SPIRIT guidelines are referenced. All pre-specified outcomes are reported, with separate reporting for MRI outcomes acknowledged. Limitations are discussed in a dedicated paragraph. Conclusions are proportional to the evidence. Funding sources and conflicts of interest are explicitly stated.

Sub-criteria

funding coiADEQUATE

trial registrationADEQUATE

reporting guidelineADEQUATE

methods completenessADEQUATE

all outcomes reportedADEQUATE

limitations discussedADEQUATE

conclusions proportionalADEQUATE

Per reviewer (3) — the votes behind the verdict

PASSReviewer 1· 90% conf

Reporting is comprehensive: prospective trial registration, CONSORT/SPIRIT adherence, complete methods, transparent null results, detailed limitations, proportional conclusions, and funding/COI disclosures.

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

“Changes in BP and HR did not differ significantly between diets.”

ResultsFind in source

PASSReviewer 2· 95% conf

The manuscript is transparent: methods are complete, trial registered, reporting guidelines followed, all outcomes reported, limitations discussed, conclusions proportional, and funding/COI declared.

Evidence

paraphrase[Abstract]

“Clinicaltrials.gov registration: NCT05627570 (https://clinicaltrials.gov/study/NCT05627570).”

paraphrase[Methods, first paragraph]

“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).”

“Limitations include that a potential carryover effect cannot be ruled out. However, the washout period helped minimize this. People with dietary restrictions (for example, vegan, halal, kosher) were excluded due to financial and logistical constraints, limiting generalizability.”

Discussion ¶12Find in source

PASSReviewer 3· 95% conf

The manuscript is transparent with detailed methods, trial registration, adherence to reporting guidelines, all outcomes reported, limitations discussed, proportional conclusions, and funding/COI statements.

Evidence

paraphrase[Abstract]

“Clinicaltrials.gov registration: NCT05627570 (https://clinicaltrials.gov/study/NCT05627570).”

paraphrase[Methods, Participants and setting]

paraphrase[Discussion, paragraph 10]

“Limitations include that a potential carryover effect cannot be ruled out... People with dietary restrictions... were excluded due to financial and logistical constraints, limiting generalizability.”

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

ClinicalTrials.gov

NCT05627570

Reporting guidelines: 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.

6 data/code links checked; 6 live.

datahttps://clinicaltrials.gov/study/NCT05627570LIVEHTTP 200
Resolves, but the content could not be matched to the paper.
datahttps://clinicaltrials.gov/ct2/show/NCT05627570LIVEHTTP 200
Resolves, but the content could not be matched to the paper.
codeGitHubLIVEHTTP 200
https://github.com/SamuelJDicken/UPDATE
Resolves to GitHub (code repository).
codehttps://www.sealedenvelope.comLIVEHTTP 200
Resolves, but the content could not be matched to the paper.
codehttps://intake24.co.ukLIVEHTTP 200
Resolves, but the content could not be matched to the paper.
codehttps://www.project-redcap.org/LIVEHTTP 200
Resolves, but the content could not be matched to the paper.

Copyediting

5 minor

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

No major wording or formatting errors. 5 minor suggestions below.

5 copyedit issues flagged: mostly consistency, typo, clarity.

MINORconsistencyResults, Participant disposition
“135 adults underwent screening, of whom 55 (40.1%) were eligible”
→ Change to 40.7% (55/135 = 40.7%)
Arithmetic discrepancy.
MINORtypoTable 3 footnote
“Gastrointestinal adverse events: two vomiting/nausea, one diarrhea, one dyspepsia/gastresophageal reflux on the MPF diet ...”
→ Change 'gastresophageal' to 'gastroesophageal'
Typo in footnote.
MINORclarityAbstract
“Findings indicate greater weight loss on MPF than UPF diets and needing dietary guidance on food processing in addition to existing recommendations.”
→ Rephrase, e.g. '...diets and suggest a need for dietary guidance on food processing...'
Awkward grammar ('needing dietary guidance').
MINORconsistencyResults vs Methods
“A significant diet order effect was detected ( P interaction < 0.05 ...) ... This interaction was significant ( P < 0.001)”
→ Use one consistent threshold/precision for the same interaction term
Same interaction reported with different precision (<0.05 and <0.001).
MINORgrammarAbstract
“Findings indicate greater weight loss on MPF than UPF diets and needing dietary guidance on food processing in addition to existing recommendations.”
→ Rephrase to 'Findings indicate greater weight loss on MPF than UPF diets, suggesting the need for dietary guidance on food processing in addition to existing recommendations.'
Awkward phrasing: 'and needing' is not standard.

Kaimen Rigor Action ItemsFinal pass before journal submission

As a post-publication audit, the published work is methodologically robust and its core findings (weight loss on MPF vs UPF) are credible; an informed reader should weigh the minor reporting gaps above. The most consequential item is the overstated 'cardiometabolic improvements' conclusion, which would warrant a clarificatory correction or re-framing; the arithmetic and interaction-precision inconsistencies are minor and would warrant a typographical erratum. None of the issues threaten the validity of the primary outcome.

1.
HIGHrigor
Temper the headline claim 'The MPF diet conferred greater cardiometabolic improvements than the UPF diet' in the Abstract and Discussion to reflect that only triglycerides were significantly lower on MPF, LDL-C was significantly lower on UPF, and BP, glucose, lipids and HbA1c mostly did not differ between diets.
The claim_audit rated this conclusion as overstated relative to the presented evidence, and over-claiming is the most common reviewer objection in a post-publication robustness assessment.
2.
HIGHethics
Add an explicit regulatory-compliance statement (e.g. 'The trial was conducted in accordance with the Declaration of Helsinki') in the Methods/Ethics section.
All three reviewers flagged the absence of a named compliance framework as the sole reason for the ethical_approvals warn; a one-sentence addition would resolve it.
3.
MEDIUMcopyedit
Correct the eligibility percentage in Results, Participant disposition from 40.1% to 40.7% (55/135).
This is a demonstrable arithmetic error independently flagged by a reviewer, the copyedit pass, and the integrity check.
4.
MEDIUMreporting
Use one consistent significance value for the treatment-by-period interaction: reconcile 'P interaction < 0.05' (Results) with 'P < 0.001' (Methods).
The same interaction term is reported with different precision across sections, which is an internal-consistency gap flagged by a reviewer, the copyedit pass, and the integrity check.
5.
MEDIUMcopyedit
Fix the typo 'gastresophageal' to 'gastroesophageal' in the Table 3 footnote.
Copyedit-flagged typo in the adverse-events footnote.
6.
MEDIUMcopyedit
Rephrase the Abstract sentence 'Findings indicate greater weight loss on MPF than UPF diets and needing dietary guidance on food processing...' to 'Findings indicate greater weight loss on MPF than UPF diets, suggesting the need for dietary guidance on food processing...'.
The current phrasing ('and needing dietary guidance') is grammatically awkward and was flagged by the copyedit pass.
7.
MEDIUMreporting
Clarify whether outcome assessors beyond the primary outcome (e.g. those measuring blood pressure, body composition, blood samples) were blinded to diet allocation.
Reviewer 2 noted that blinding is described for participants and the independent statistician, but not for other outcome assessors; this is a transparency gap relevant to bias assessment.
8.
MEDIUMreporting
Provide more specific identification of UPF items (representative brands, manufacturers, or a product list in supplementary materials) in the Methods/Intervention section.
Reviewer 2 flagged the UPF source as vague ('leading UK supermarkets'); more detail would strengthen reproducibility of the intervention.
9.
LOWdata code
Add a permanent identifier (e.g. a Zenodo DOI) for the code repository to ensure long-term accessibility.
Reviewer 3 suggested this; a DOI guards against link rot and improves the reproducibility record.
10.
LOWreporting
Add a brief justification in the Discussion for the high proportion of female participants (90.9%).
Reviewer 3 noted this could help address potential sex-imbalance concerns about generalizability.
11.
LOWdata code
Consider depositing summary-level (aggregate) data in a repository such as Figshare or Dryad, or formally naming a data-access committee (e.g. UCL Data Access Committee) in the Data Availability statement.
Reviewer 2 suggested this would move the data availability statement from a managed-access route to a more formal, discoverable arrangement.
12.
LOWstatistics
Report the exact t-statistic (or test statistic with df) for the primary outcome to allow full reproducibility of the p-value.
Reviewer 2 suggested this; the primary outcome is currently reported with p-value and CI but without the underlying test statistic.

Full text (76,973 chars · analyzed ~97%, head + tail)Analyzed: Aug 10, 2026

RigorReviewer 1

RigorReviewer 2

RigorReviewer 3

RigorPre-Submission Reviewer

CopyeditAgent Scribe

CitationsCitation Integrity

StatisticsStatistics Consistency

ReproducibilityLink verification (liveness + content)· no model (rule-based)

PreregistrationDeterministic check· no model (rule-based)

The star rating is the report’s one-glance summary. Every paper starts at 5★ and loses stars for the concrete problems the review finds — so a rating is never a vague average, it’s a running total you can read line by line under “How this rating was calculated.”

How stars are deducted

Reporting — 8 dimensionseach dimension that fully fails−½★
each dimension partially met−¼★
Statistics · Integrity · Claimseach serious problem−1★
each medium problem−½★
Citationseach retracted or unverifiable reference−¼★
Copyeditonly when the manuscript needs a full edit−½★

The rating never drops below 1★, and a demonstrable critical failure (an impossible statistic, a proven ethics violation) caps it at 1★ on its own — so the stars can never look healthy when the verdict is CRITICAL.

The rating draws on a panel of agents. Three independent Kaimen Rigor reviewers grade the eight dimensions below across several independent passes (the shown verdict is their majority vote — steadier than any single run), isolate the paper’s major claims and check its own evidence backs them, and flag integrity concerns. Alongside them, a citation agent resolves every reference against Crossref, OpenAlex, and Retraction Watch; a statistics agent recomputes reported tests; and rule-based checks verify that declared data/code links actually resolve. Full text is required — an abstract-only submission is not analyzed.

The eight reporting dimensions

Scientific PremisePrior work, rationale, and how it addresses gaps.

Study Design & RigorRandomization, blinding, power, controls, replication.

Biological VariablesSex, age, species/strain, housing, demographics.

Ethical ApprovalsIRB/IACUC approval, informed consent, regulatory compliance.

Key ResourcesAntibodies, cell lines, organisms, software — identified with persistent IDs.

Statistical ReportingNamed tests, exact p-values, effect sizes, plausible summary stats.

Data & Code AvailabilityAvailability statements, repositories, accession numbers, shared code.

Reporting TransparencyMethods, registration, guidelines, outcomes, limitations, funding/COI.

Graded against NIH, MDAR, ARRIVE 2.0, CONSORT, EQUATOR, and RRID guidelines. A dimension that doesn’t apply to the study type is skipped, never penalized.

This Kaimen Rigor review is model-assisted and is not a substitute for formal expert review. It complements human evaluation by surfacing potential methodological concerns — verify each finding against the source.

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

DOI

10.1038/s41591-025-03842-0

Record issued

2026-08-10

Engine

7.29.0

Exported

2026-09-22