Skip to main content
Tessa NewsLink
Paste a health news link, or browse

Source study found

Story checked

Three months of yoga before surgery revealed a surprising difference in stress hormones (opens in a new tab)

news-medical.net · 2026-10-12

Short answerEvidenceSource

Short answer

Mixed

Mixed.

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

  • 3 supported
  • 2 not covered

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

Share this check

Follow the evidence trail
1
2

NewsLink checks it

Mixed

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

  • 3 supported
  • 2 not covered
Open claim evidence
3

The source study

Influence of yoga on the epigenetics of obesity: a study on its short- and medium-term benefits in the treatment of patients with severe/morbid obesity eligible for bariatric surgery

Frontiers in Public Health · 2026
Open source record (opens in a new tab)
Source paper

Source layer

The 2 papers the story cites

Source study separated from background citations.

The research anchor for the report.

  • The study this story reportspresented as the new finding

    Influence of yoga on the epigenetics of obesity: a study on its short- and medium-term benefits in the treatment of patients with severe/morbid obesity eligible for bariatric surgery

    Frontiers in Public Health · 2026

    Publisher (opens in a new tab)
  • The study this story reportspresented as the new finding

    Influence of yoga on the epigenetics of obesity: a study on its short- and medium-term benefits in the treatment of patients with severe/morbid obesity eligible for bariatric surgery

    Publisher (opens in a new tab)
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 coveredThe study, published in Frontiers in Public Health, was a prospective, non-randomized observational study of 40 adult bariatric-surgery candidates in Italy.View evidenceHide evidence

As stated40 adult candidates

Why this verdict

The abstract-level profile supports the prospective, non-randomised controlled observational cohort design and sample size of 40 patients, with 20 yoga and 20 control participants. However, the profile at this depth does not verify all details in the claim, especially that the candidates were adult patients in Italy; the journal is suggested by the DOI/profile metadata but not established by the appraisal units themselves.

1

Study evidence

Baseline-adjusted reduction in plasma noradrenaline at T1 associated with the yoga program.Adjusted difference −206.92 (95% CI −349.62 to −64.21), p = 0.0057

“In this prospective, non-randomised, controlled observational cohort study, 40 patients were analysed (20 yoga, 20 control).”
Claim 2 of 5Not coveredThe article says the study did not establish clear psychological, metabolic, or postoperative benefits from preoperative yoga, and it notes the small, non-randomized, single-center design limited conclusions.View evidenceHide evidence

Why this verdict

The abstract-level profile supports that psychological outcomes were not significantly different, several metabolic/clinical outcomes were null or inconclusive, and the small non-randomised observational design limits causal conclusions. However, the supplied abstract-level profile does not verify every part of the claim, including the single-center characterization and the scope of postoperative-benefit conclusions.

1

Study evidence

Baseline-adjusted reduction in plasma noradrenaline at T1 associated with the yoga program.Adjusted difference −206.92 (95% CI −349.62 to −64.21), p = 0.0057

“In this prospective, non-randomised, controlled observational cohort study, 40 patients were analysed (20 yoga, 20 control).”
2

Study evidence

Psychological outcomes, designated a secondary domain, did not differ significantly between the yoga and control groups as reported in the abstract.

“Psychological outcomes, a secondary domain, did not differ significantly between groups.”
Claim 3 of 5SupportedAfter baseline adjustment, the yoga group had significantly lower plasma noradrenaline levels than controls before surgery, which the article describes as consistent with reduced sympathetic activation.View evidenceHide evidence

As statedsignificantly lower

Why this verdict

The profile reports that plasma noradrenaline was significantly lower in the yoga group at the T1 post-intervention/pre-surgery timepoint after baseline adjustment, with an adjusted difference of −206.92 and p = 0.0057. It also states that the authors interpreted this as consistent with reduced sympathetic activation. Although the claim has headline prominence, it remains associational and does not outrun the paper evidence.

1

Study evidence

Baseline-adjusted reduction in plasma noradrenaline at T1 associated with the yoga program.Adjusted difference −206.92 (95% CI −349.62 to −64.21), p = 0.0057

“In this prospective, non-randomised, controlled observational cohort study, 40 patients were analysed (20 yoga, 20 control).”
Claim 4 of 5SupportedResearchers examined whether three months of yoga before bariatric surgery could influence stress hormones, inflammation, and gene-regulation processes in patients with severe obesity.View evidenceHide evidence

As statedthree months

Why this verdict

The abstract-level profile supports that the study evaluated a structured 3-month preoperative PRANA_it yoga program in bariatric-surgery-eligible patients and assessed neuroendocrine/stress-hormone, metabolic/clinical, inflammatory, and targeted epigenetic/DNA-methylation outcomes. The claim is framed as an examined association rather than a proven effect.

1

Study evidence

Baseline-adjusted reduction in plasma noradrenaline at T1 associated with the yoga program.Adjusted difference −206.92 (95% CI −349.62 to −64.21), p = 0.0057

“In this prospective, non-randomised, controlled observational cohort study, 40 patients were analysed (20 yoga, 20 control).”
2

Study evidence

No significant changes in DNA methylation were observed for TNF-α, IL-6, or CRP after correction for multiple comparisons in the targeted panel.

“DNA methylation was profiled using a targeted three-gene inflammatory panel (TNF-α, IL-6, CRP).”
Claim 5 of 5SupportedThe study did not find statistically significant DNA methylation changes at the targeted sites in TNF-α, IL-6, and CRP.View evidenceHide evidence

As statedthree inflammatory genes

Why this verdict

The profile directly states that targeted DNA methylation of TNF-α, IL-6, and CRP showed no significant changes after correction for multiple comparisons.

1

Study evidence

Baseline-adjusted reduction in plasma noradrenaline at T1 associated with the yoga program.Adjusted difference −206.92 (95% CI −349.62 to −64.21), p = 0.0057

“In this prospective, non-randomised, controlled observational cohort study, 40 patients were analysed (20 yoga, 20 control).”
2

Study evidence

No significant changes in DNA methylation were observed for TNF-α, IL-6, or CRP after correction for multiple comparisons in the targeted panel.

“DNA methylation was profiled using a targeted three-gene inflammatory panel (TNF-α, IL-6, CRP).”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Incomplete adherence to the yoga program was reported, with mean attendance of 72.5%, which could affect interpretation of intervention exposure.

    The story describes the program duration but does not mention incomplete attendance/adherence, a limitation relevant to interpreting intervention exposure and possible effect size.

    From Prospective non-randomised controlled observational cohort; prospective non-randomised controlled observational cohort

  • The methylation analysis was limited to a targeted peripheral three-gene panel and could miss broader or tissue-specific epigenetic changes.

    Although the story says the methylation sites in TNF-α, IL-6, and CRP were not significant, it does not mention the paper-profile caveat that a targeted peripheral panel may miss tissue-specific or broader methylation changes.

    From Prospective non-randomised controlled observational cohort; prospective non-randomised controlled observational cohort

  • Some inflammatory or clinical signals, such as circulating TNF-α protein, were exploratory, unadjusted, or high-variance and therefore not robust conclusions.

    The story focuses on the noradrenaline signal and null methylation result, but does not reflect the profile’s caution about exploratory/unadjusted inflammatory-protein findings with high variance.

    From Prospective non-randomised controlled observational cohort; prospective non-randomised controlled observational cohort

7 things the story did carry across
  • The study’s central design was a prospective, non-randomised controlled observational cohort of 40 bariatric-surgery-eligible patients comparing a yoga program with control care.
  • The intervention consisted of 36 PRANA_it yoga sessions over 3 months before bariatric surgery, with reported mean attendance of 26/36 sessions.
  • The primary emphasized finding was a baseline-adjusted association between yoga participation and lower plasma noradrenaline at T1 before surgery.
  • No significant DNA methylation changes were detected in the targeted TNF-α, IL-6, and CRP inflammatory gene panel after multiple-comparisons correction.
  • Psychological outcomes did not differ significantly between groups, and other clinical/metabolic outcomes were mostly null or inconclusive after adjustment.
  • The non-randomised observational design limits causal inference and raises risk of confounding or selection bias.
  • The small sample size of 40 participants limits statistical power, precision, and generalisability.
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

3

Evidence read

study summary

Lead result

human in vivo

1Lead resulthuman in vivoAssess whether participation in a structured preoperative yoga program is associated with changes in clinical/hormonal/metabolic/quality-of-life outcomes in patients with severe/morbid obesity awaiting bariatric surgery (e.g., plasma noradrenaline; exploratory secondary endpoints).Prospective non-randomised controlled observational cohortExpand

In plain English

Prospective non-randomised controlled cohort (20 yoga, 20 control) of bariatric-surgery-eligible patients found a baseline-adjusted reduction in plasma noradrenaline at the primary follow-up (T1) associated with a structured 3-month preoperative yoga program; no significant DNA methylation changes were detected in a targeted TNF-α/IL-6/CRP panel after multiple-comparisons correction. Other clinical, metabolic, and psychological endpoints showed either null or inconclusive results after baseline adjustment.

Key findings

  • Baseline-adjusted reduction in plasma noradrenaline at T1 associated with the yoga program.Adjusted difference −206.92 (95% CI −349.62 to −64.21), p = 0.0057
  • No significant changes in DNA methylation of TNF-α, IL-6, and CRP after correction for multiple comparisons.
“In this prospective, non-randomised, controlled observational cohort study, 40 patients were analysed (20 yoga, 20 control).”
What this piece can’t prove
  • Non-randomised controlled observational design limits causal inference and increases risk of confounding.
  • Small total sample size (n=40) reduces statistical power and precision.
  • Intervention adherence incomplete (mean attendance 72.5%), which may attenuate effects.
  • Methylation assessment limited to a targeted three-gene peripheral blood panel; tissue-specific epigenetic changes could be missed.
  • Some reported findings were significant only in unadjusted analyses or had high variance; multiple-comparisons correction reduced detectability of methylation effects.
  • Abstract provides limited detail on assay methods, timing of T2, and potential covariates adjusted beyond baseline.
2human in vivoAssess whether participation in the yoga program is associated with changes in inflammatory/epigenetic markers, specifically DNA methylation in a targeted inflammatory gene panel (TNF-α, IL-6, CRP) and related inflammatory protein measures (e.g., circulating TNF-α).prospective non-randomised controlled observational cohortExpand

In plain English

In a prospective, non-randomised controlled cohort of 40 patients with severe/morbid obesity awaiting bariatric surgery (20 yoga, 20 control), targeted DNA methylation of three inflammatory genes (TNF-α, IL-6, CRP) was profiled from peripheral biospecimens and compared between groups. After correction for multiple comparisons, no significant methylation changes were detected in the targeted panel. An exploratory/unadjusted comparison found a greater change in circulating TNF-α protein in the yoga group (p = 0.0452) but with high variance and without adjustment for multiple testing. Between-group analyses used baseline-adjusted ANCOVA for many outcomes. The authors note that detectable methylation remodeling may require longer exposure, larger samples, or tissue-specific sampling.

Key findings

  • No significant changes in DNA methylation were observed for TNF-α, IL-6, or CRP after correction for multiple comparisons in the targeted panel.
  • Circulating TNF-α protein showed a greater change in the yoga group in an unadjusted analysis (reported p = 0.0452), described as an exploratory signal with high variance.p = 0.0452 (unadjusted)
“DNA methylation was profiled using a targeted three-gene inflammatory panel (TNF-α, IL-6, CRP).”
What this piece can’t prove
  • Non-randomised design (authors state this precludes causal inference).
  • Small cohort (n=40) limits power to detect modest methylation changes.
  • Relatively short exposure period (3 months) may be insufficient for detectable DNA methylation remodeling.
  • Targeted peripheral methylation panel (TNF-α, IL-6, CRP) may not capture broader or tissue-specific epigenetic changes.
  • Exploratory/unadjusted protein findings (e.g., circulating TNF-α) have high variance and may not be robust to adjustment or multiple-testing correction.
3human in vivoAssess whether participation in the yoga program is associated with changes in psychological outcomes (secondary domain).Prospective non-randomised controlled observational cohortExpand

In plain English

In this prospective, non-randomised controlled cohort of 40 patients (20 yoga, 20 control) preparing for bariatric surgery, psychological outcomes—specified as a secondary domain and assessed via patient-reported questionnaires—did not differ significantly between the yoga and control groups in between-group comparisons reported in the abstract.

Key findings

  • Psychological outcomes, designated a secondary domain, did not differ significantly between the yoga and control groups as reported in the abstract.
“Psychological outcomes, a secondary domain, did not differ significantly between groups.”
What this piece can’t prove
  • Non-randomised, observational design limits causal inference.
  • Small sample size (20 per group) may be underpowered for detecting changes in secondary psychological outcomes.
  • Psychological outcomes were a secondary domain and may not have been the focus of primary power calculations or prespecified detailed analyses.

1 further detail could not be confirmed from the summary.

Finally, the search trail

Method layer

NewsLink found the paper. Tessa takes you deeper.

NewsLink checks the story. Tessa is where you inspect the paper, authors, evidence, and research context.

Open the paper in Tessa

Influence of yoga on the epigenetics of obesity: a study on its short- and medium-term benefits in the treatment of patients with severe/morbid obesity eligible for bariatric surgery

Frontiers in Public Health · 2026

Source record (opens in a new tab)

Why this one

Near certain

NewsLink found the paper. Tessa is where you inspect it deeply.

Papers considered

The selected paper, plus nearby candidates.

Crossref, Europe PMC, PubMed · 40 candidate papers

Selected

Influence of yoga on the epigenetics of obesity: a study on its short- and medium-term benefits in the treatment of patients with severe/morbid obesity eligible for bariatric surgery

Frontiers in Public Health · 2026 · Crossref

Source (opens in a new tab)

And 34 more candidates considered.