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CT scans linked vitamin D levels to fat within muscles after bariatric surgery (opens in a new tab)

news-medical.net · 2026-10-27

Short answerEvidenceSource

Short answer

Mostly supported

Mostly supported.

The claims we could check match the study, but some claims were not covered by the evidence reviewed.

  • 4 supported
  • 1 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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1
2

NewsLink checks it

Mostly supported

Every claim we could check holds up. Four of five claims match the study. This overall rating is based only on the claims we could check. One claim the study doesn't address.

  • 4 supported
  • 1 not covered
Open claim evidence
3

The source study

Associations of postoperative vitamin D with body composition changes after bariatric surgery: a prospective cohort study

BMC Medical Imaging · 2026
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Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5Not coveredAmong patients whose vitamin D concentrations increased, changes in vitamin D were not significantly associated with changes in fat and muscle measurements after correction for multiple comparisons.View evidenceHide evidence

Why this verdict

The abstract profile supports the core null result that Δ25(OH)D was not significantly correlated with changes in body composition after FDR/multiple-comparison adjustment. However, the story specifies the analysis as being among patients whose vitamin D concentrations increased; that subgroup restriction is not described in the abstract-level profile, so that part cannot be verified at this evidence depth.

1

Study evidence

After false-discovery-rate adjustment, no correlations between Δ25(OH)D (baseline to 1 year) and changes in QCT-assessed body composition measures were statistically significant.

“Spearman correlation analysis was applied to explore correlations of postoperative 25(OH)D and its changes (△) with postoperative indicators.”
Claim 2 of 5SupportedResearchers used CT imaging to examine how vitamin D relates to changes in muscle and abdominal fat during the first year after bariatric surgery.View evidenceHide evidence

Why this verdict

The abstract profile supports that this was a prospective bariatric-surgery cohort using quantitative CT body-composition measures at baseline and 1 year, and that analyses examined postoperative 25(OH)D associations as well as change in 25(OH)D versus changes in body composition. The claim is framed associationally, not causally.

1

Study evidence

Postoperative serum 25(OH)D increased from 11.92 to 21.24 ng/mL (P < 0.001), but 72.6% of patients remained deficient at 1 year.11.92 vs. 21.24 ng/mL, P < 0.001

“A total of 113 individuals with obesity undergoing bariatric surgery were included.”
2

Study evidence

After false-discovery-rate adjustment, no correlations between Δ25(OH)D (baseline to 1 year) and changes in QCT-assessed body composition measures were statistically significant.

“Spearman correlation analysis was applied to explore correlations of postoperative 25(OH)D and its changes (△) with postoperative indicators.”
Claim 3 of 5SupportedA recent study in BMC Medical Imaging found that higher postoperative vitamin D concentrations were associated with less fat infiltration within certain muscles and lower visceral fat in adults with obesity after bariatric surgery.View evidenceHide evidence

Why this verdict

The abstract profile reports that higher postoperative 25(OH)D was negatively correlated with erector spinae/psoas muscle fat measures and visceral adiposity measures, with FDR-adjusted significance, and that the vitamin-D-deficient group had higher muscle fat infiltration and VAT/VATI. This matches the story's associational framing.

1

Study evidence

Postoperative serum 25(OH)D increased from 11.92 to 21.24 ng/mL (P < 0.001), but 72.6% of patients remained deficient at 1 year.11.92 vs. 21.24 ng/mL, P < 0.001

“A total of 113 individuals with obesity undergoing bariatric surgery were included.”
Claim 4 of 5SupportedThe researchers also explored the predictive value of preoperative vitamin D for postoperative body composition.View evidenceHide evidence

Why this verdict

The abstract profile explicitly states that linear regression was used to evaluate the predictive value of preoperative 25(OH)D for postoperative body composition, and that no predictive associations were found. The story's hedged 'explored' wording is consistent with the paper profile.

1

Study evidence

Preoperative 25(OH)D does not predict postoperative (1-year) QCT body composition parameters.

“Linear regression analysis was applied to evaluate the predictive value of preoperative 25(OH)D for postoperative body composition.”
Claim 5 of 5SupportedThe article says the findings support monitoring vitamin D and body composition after surgery, but do not establish that raising vitamin D concentrations improves these outcomes.View evidenceHide evidence

Why this verdict

The paper profile reports an observational cohort with cross-sectional 1-year associations and null change-score/prognostic analyses, while the discussion recommends postoperative monitoring of 25(OH)D and body composition. The story's caveat that the findings do not establish that raising vitamin D improves outcomes is consistent with the observational design and the lack of significant Δ25(OH)D associations.

1

Study evidence

Postoperative serum 25(OH)D increased from 11.92 to 21.24 ng/mL (P < 0.001), but 72.6% of patients remained deficient at 1 year.11.92 vs. 21.24 ng/mL, P < 0.001

“A total of 113 individuals with obesity undergoing bariatric surgery were included.”
2

Study evidence

After false-discovery-rate adjustment, no correlations between Δ25(OH)D (baseline to 1 year) and changes in QCT-assessed body composition measures were statistically significant.

“Spearman correlation analysis was applied to explore correlations of postoperative 25(OH)D and its changes (△) with postoperative indicators.”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • SG-only sensitivity analysis reportedly showed similar cross-sectional postoperative findings.

    The paper profile includes a supporting sensitivity analysis restricted to sleeve gastrectomy patients. The story caveats mention that different bariatric procedures were included, but the presented claims do not report the SG-only robustness analysis.

    From SG-only sensitivity analysis (subgroup)

  • Large majority of patients remained 25(OH)D-deficient at 1 year, which may limit group contrasts and interpretation.

    The paper profile identifies persistent deficiency in 72.6% as a limitation relevant to interpreting deficient-versus-normal contrasts. This caveat is not listed among the story's mentioned caveats.

    From prospective cohort

5 things the story did carry across
  • Prospective observational cohort of 113 adults with obesity undergoing bariatric surgery, with baseline and 1-year follow-up biochemical and QCT body-composition measurements.
  • Main cross-sectional finding: higher postoperative 25(OH)D at 1 year was associated with lower muscle fat infiltration measures and lower visceral adiposity.
  • Change-score analysis: Δ25(OH)D from baseline to 1 year was not significantly correlated with changes in body-composition measures after FDR adjustment.
  • Preoperative 25(OH)D did not predict postoperative 1-year body-composition parameters in the abstract-reported regression analysis.
  • Important limitation: the principal postoperative vitamin D-body composition findings are observational and largely cross-sectional at the 1-year timepoint, so they do not establish causality or that increasing vitamin D improves body composition.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

4

Evidence read

study summary

Lead result

human in vivo

1Lead resulthuman in vivoDetermine whether postoperative serum 25(OH)D levels are associated with postoperative body composition (QCT-derived muscle fat infiltration and visceral adiposity) 1 year after bariatric surgery.prospective cohortExpand

In plain English

In a prospective cohort of 113 bariatric surgery patients with baseline and 1-year follow-up, higher postoperative serum 25-hydroxyvitamin D [25(OH)D] at 1 year was cross-sectionally associated with lower QCT-derived muscle fat infiltration (erector spinae and psoas measures) and lower visceral adiposity (VAT, VATI). Postoperative 25(OH)D increased on average from 11.92 to 21.24 ng/mL (P < 0.001) but 72.6% of patients remained deficient. Group comparisons (postoperative deficient vs normal) and Spearman correlations (FDR-adjusted) supported these associations. Changes in 25(OH)D and preoperative 25(OH)D did not predict postoperative body composition.

Key findings

  • Postoperative serum 25(OH)D increased from 11.92 to 21.24 ng/mL (P < 0.001), but 72.6% of patients remained deficient at 1 year.11.92 vs. 21.24 ng/mL, P < 0.001
  • At 1 year, the 25(OH)D-deficient group had significantly higher erector spinae muscle fat (ESMF), ESMF fraction (ESMFF), psoas major muscle fat fraction (PMMFF), visceral adipose tissue (VAT) and VAT index (VATI) than the normal group (P < 0.05).
“A total of 113 individuals with obesity undergoing bariatric surgery were included.”
What this piece can’t prove
  • Findings are from cross-sectional analyses at the 1-year postoperative timepoint within an observational cohort.
  • A large majority of patients remained 25(OH)D-deficient at 1 year (72.6%), which may limit contrasts between groups.
  • Abstract does not report correlation coefficients or detailed effect sizes for the associations.
2human in vivoTest whether change in 25(OH)D from baseline to 1 year (Δ25(OH)D) correlates with change in body composition measures over the same period.prospective cohort pre-postExpand

In plain English

In a prospective cohort of 113 bariatric surgery patients with baseline and 1-year follow-up, Spearman correlations were used to test whether within-person change in serum 25(OH)D (Δ25(OH)D) was associated with changes in QCT-assessed body composition measures; after false-discovery-rate adjustment, no correlations between Δ25(OH)D and changes in body composition remained statistically significant.

Key findings

  • After false-discovery-rate adjustment, no correlations between Δ25(OH)D (baseline to 1 year) and changes in QCT-assessed body composition measures were statistically significant.
“Spearman correlation analysis was applied to explore correlations of postoperative 25(OH)D and its changes (△) with postoperative indicators.”
What this piece can’t prove
  • Reporting is limited to the abstract: numerical effect estimates (correlation coefficients, CIs, exact p-values) for Δ25(OH)D versus changes in body composition are not provided.
  • Power to detect correlations is not reported; with 113 participants the study may have limited ability to detect small associations after multiple-testing correction.
  • Abstract does not specify which exact body-composition change variables were included in the Δ–Δ correlation tests beyond the examples cited elsewhere for cross-sectional analyses.

1 further detail could not be confirmed from the summary.

3human in vivoEvaluate whether preoperative 25(OH)D predicts postoperative (1-year) body composition parameters (prognostic value).Prospective cohort; prognostic linear regressionExpand

In plain English

In a prospective cohort of 113 bariatric surgery patients, linear regression was used to test whether preoperative serum 25(OH)D predicted 1-year postoperative QCT-assessed body composition; the abstract reports no predictive associations (P > 0.05).

Key findings

  • Preoperative 25(OH)D does not predict postoperative (1-year) QCT body composition parameters.
“Linear regression analysis was applied to evaluate the predictive value of preoperative 25(OH)D for postoperative body composition.”
What this piece can’t prove
  • Abstract lacks details on regression model specification (covariates, interaction terms, model form) and does not report effect sizes or uncertainty measures.
  • Potential limited statistical power with n = 113 for detecting prognostic associations.
  • Only a single postoperative time point (1 year) is assessed; longer-term predictive value is not addressed.

1 further detail could not be confirmed from the summary.

4human in vivoAssess robustness of postoperative 25(OH)D–body composition associations in a sensitivity analysis restricted to sleeve gastrectomy (SG) patients.SG-only sensitivity analysis (subgroup)Expand

In plain English

Authors report that sensitivity analyses restricted to sleeve gastrectomy (SG) patients produced similar cross-sectional postoperative associations between higher serum 25(OH)D and lower muscle fat infiltration and visceral adiposity.

Key findings

  • In analyses restricted to sleeve gastrectomy patients, the authors report similar cross-sectional associations as in the overall cohort: higher postoperative serum 25(OH)D was associated with lower muscle fat infiltration and lower visceral adiposity.
“SG-only sensitivity analyses showed similar cross-sectional findings.”
What this piece can’t prove
  • The abstract provides only a brief statement that SG-only sensitivity analyses showed similar findings; detailed methods and numerical results for this subgroup are not reported.
  • No information given on SG subgroup sample size, power, or whether subgroup selection could introduce bias.
  • Unspecified whether the subgroup analyses were exploratory or pre-specified, and no information on correction for multiple comparisons.
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Open the paper in Tessa

Associations of postoperative vitamin D with body composition changes after bariatric surgery: a prospective cohort study

BMC Medical Imaging · 2026

Source record (opens in a new tab)

Why this one

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 16 candidate papers

Selected

Associations of postoperative vitamin D with body composition changes after bariatric surgery: a prospective cohort study

BMC Medical Imaging · 2026 · Crossref

Source (opens in a new tab)

And 10 more candidates considered.