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Belly Fat, Not Age, May Be The Bigger Driver of Low Testosterone : ScienceAlert (opens in a new tab)

sciencealert.com · 2026-09-09

Short answerEvidenceSource

Short answer

Mixed

Mixed.

One claim goes further than the study. 2 other points were not covered by the paper.

  • 2 supported
  • 1 overstated
  • 2 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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NewsLink checks it

Mixed

One claim overstates the study. Two of five check out. Two claims the study doesn't address.

  • 2 supported
  • 1 overstated
  • 2 not covered
Open claim evidence
3
Source paper

Source layer

The 5 papers the story cites

Source study separated from background citations.

The research anchor for the report.

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 5OverstatedThe article says interventions that reduce visceral fat, including drugs like Ozempic or Wegovy, may address low testosterone more directly than testosterone replacement therapy alone.View evidenceHide evidence

Why this verdict

The paper profile describes cross-sectional observational associations between visceral adiposity and testosterone; it does not test visceral-fat-reducing interventions, GLP-1 drugs such as Ozempic or Wegovy, testosterone replacement therapy, or comparative treatment effects. Even though the story hedges with 'may,' the claim extrapolates from association to a causal/interventional treatment implication that the abstract-level paper evidence does not establish.

1

Study evidence

Visceral adiposity (DXA-derived VAT) was strongly and inversely associated with morning total testosterone.

“This was a cross-sectional analysis of 4948 US men, aged 20-59, from the 2011-2016 National Health and Nutrition Examination Survey (NHANES).”
2

Study evidence

Within each BMI category (normal-weight, overweight, obese), men in the highest VAT quartile had substantially lower total testosterone than men in the lowest VAT quartile.33–36% lower total testosterone

“VAT discordance phenotypes were defined as the lowest vs highest quartile of VAT within BMI and (WC) categories.”
Claim 2 of 5Not coveredAging may not impact testosterone levels as much as people might think, and circulating testosterone in men usually begins to decline only very gradually from about age 35.View evidenceHide evidence

Why this verdict

The abstract-level profile verifies that the study included US men aged 20–59, but it does not report age-specific testosterone trends, a gradual decline beginning around age 35, or a direct comparison of aging versus visceral fat as determinants of testosterone. This claim may be true from other literature or full-text context, but it is not verifiable from the supplied abstract-depth paper profile.

1

Study evidence

Visceral adiposity (DXA-derived VAT) was strongly and inversely associated with morning total testosterone.

“This was a cross-sectional analysis of 4948 US men, aged 20-59, from the 2011-2016 National Health and Nutrition Examination Survey (NHANES).”
Claim 3 of 5Not coveredIn a review of health data from nearly 5,000 US men aged 20 to 59, visceral fat was strongly associated with testosterone suppression, and after accounting for fat distribution, age showed only modest associations within the study's age range.View evidenceHide evidence

As statednearly 5,000 men; ages 20 to 59

Why this verdict

The abstract supports the sample description—4,948 US men aged 20–59 from NHANES—and supports that visceral adiposity was strongly and inversely associated with total testosterone. However, the statement that age showed only modest associations after accounting for fat distribution is not reported in the abstract-level profile. Because that age-adjusted comparison is a material part of the claim, it is not verifiable at this evidence depth.

1

Study evidence

Visceral adiposity (DXA-derived VAT) was strongly and inversely associated with morning total testosterone.

“This was a cross-sectional analysis of 4948 US men, aged 20-59, from the 2011-2016 National Health and Nutrition Examination Survey (NHANES).”
Claim 4 of 5SupportedA new analysis published in the Journal of the Endocrine Society says visceral fat, or deep fat in the abdomen, may be the more precise metabolic determinant of testosterone suppression.View evidenceHide evidence

Why this verdict

The paper profile states that visceral adipose tissue may be a more precise metabolic determinant of androgen suppression and reports a strong inverse association between VAT and total testosterone. The story’s hedged, associational framing is broadly consistent, though the abstract also notes that VAT, BMI, and waist circumference had similar overall explanatory value in aggregate.

1

Study evidence

Visceral adiposity (DXA-derived VAT) was strongly and inversely associated with morning total testosterone.

“This was a cross-sectional analysis of 4948 US men, aged 20-59, from the 2011-2016 National Health and Nutrition Examination Survey (NHANES).”
2

Study evidence

Within each BMI category (normal-weight, overweight, obese), men in the highest VAT quartile had substantially lower total testosterone than men in the lowest VAT quartile.33–36% lower total testosterone

“VAT discordance phenotypes were defined as the lowest vs highest quartile of VAT within BMI and (WC) categories.”
Claim 5 of 5SupportedThe two review authors conclude that deep belly fat should be the 'primary adiposity correlate of low testosterone in US men'.View evidenceHide evidence

Why this verdict

The supplied profile says the authors conclude that visceral adiposity, rather than BMI- or waist-circumference-defined obesity, is the primary adiposity correlate of low testosterone in this sample of US men. The quoted story language matches that conclusion.

1

Study evidence

Visceral adiposity (DXA-derived VAT) was strongly and inversely associated with morning total testosterone.

“This was a cross-sectional analysis of 4948 US men, aged 20-59, from the 2011-2016 National Health and Nutrition Examination Survey (NHANES).”
2

Study evidence

Within each BMI category (normal-weight, overweight, obese), men in the highest VAT quartile had substantially lower total testosterone than men in the lowest VAT quartile.33–36% lower total testosterone

“VAT discordance phenotypes were defined as the lowest vs highest quartile of VAT within BMI and (WC) categories.”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • The study was a cross-sectional observational analysis of NHANES 2011–2016 data, not an intervention or longitudinal trial.

    The story describes a new analysis or review of health data, but the supplied caveats do not mention that the design was cross-sectional or that temporality and causality cannot be inferred. This is interpretation-changing because the story includes implications about reducing visceral fat and treatment strategy.

    From Cross-sectional analysis of NHANES 2011–2016; cross-sectional stratified phenotype analysis

  • The paper’s central comparison is VAT versus BMI and waist circumference as adiposity measures, not primarily VAT versus chronological age.

    The story summary frames visceral fat as more important than chronological age, but the abstract-level paper profile’s stated objective and results focus on VAT compared with BMI and waist circumference. Age is part of the sample definition, but age-specific findings are not reported in the supplied abstract profile.

    From Cross-sectional analysis of NHANES 2011–2016; cross-sectional stratified phenotype analysis

  • Within BMI categories, high-VAT men had 33–36% lower testosterone than low-VAT men; within waist-circumference strata, reductions were 25–39%.

    The story conveys the qualitative direction of the association but, as presented, does not report these specific within-stratum percentage differences.

    From cross-sectional stratified phenotype analysis

  • Normal-weight men with high VAT had testosterone levels comparable to obese men with low VAT.

    This is a concrete abstract-reported comparison illustrating VAT discordance, but it is not included in the supplied story claims or caveats.

    From cross-sectional stratified phenotype analysis

  • The abstract does not provide detailed adjustment sets, statistical models, confidence intervals, or uncertainty estimates.

    The supplied story caveats do not mention uncertainty or the limited statistical detail available at abstract depth. This matters when interpreting claims about relative importance or precision.

    From Cross-sectional analysis of NHANES 2011–2016; cross-sectional stratified phenotype analysis; NHANES cross-sectional anal

  • SHBG was listed as a main outcome, but the abstract profile does not report SHBG-specific association results.

    The story focuses on testosterone and does not mention SHBG. This omission is not necessarily central to the story’s testosterone framing, but SHBG is a material paper element in the supplied profile.

    From NHANES cross-sectional analysis

4 things the story did carry across
  • The analytic sample was 4,948 US men aged 20–59, with valid DXA-derived VAT measures in 4,492 participants.
  • Visceral adiposity was strongly and inversely associated with morning total testosterone.
  • Although VAT, BMI, and waist circumference had similar overall explanatory value, VAT distinguished substantial testosterone differences among men with similar BMI or waist circumference.
  • The authors conclude that low testosterone in some men may reflect visceral fat biology rather than obesity defined by BMI or waist circumference.
Then read the study layer

Study layer

Study at a glance

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Pieces of work

3

Evidence read

study summary

Lead result

secondary data

1Lead resultsecondary dataDetermine whether visceral adipose tissue (VAT) better explains variation in morning total testosterone levels than BMI or waist circumference (WC) in US men.Cross-sectional analysis of NHANES 2011–2016Expand

In plain English

Cross-sectional analysis of 4,948 US men (age 20–59) from NHANES 2011–2016 relating DXA-derived visceral adipose tissue (VAT), BMI, and waist circumference (WC) to morning serum total testosterone (and SHBG). The study reports a strong inverse association between VAT and total testosterone and finds that VAT identifies substantial testosterone differences among men with similar BMI or WC.

Key findings

  • Visceral adiposity (DXA-derived VAT) was strongly and inversely associated with morning total testosterone.
  • Although VAT, BMI, and WC showed similar overall explanatory value for testosterone, VAT identified substantial differences in testosterone among men with similar BMI or WC.
“This was a cross-sectional analysis of 4948 US men, aged 20-59, from the 2011-2016 National Health and Nutrition Examination Survey (NHANES).”
What this piece can’t prove
  • Cross-sectional design limits causal inference between VAT and testosterone.
  • DXA-derived VAT measures were missing/invalid for a subset (valid VAT in 4,492 of 4,948 participants).
  • Findings are reported for US men aged 20–59 and may not generalize to other age groups, women, or non-US populations.
  • Abstract does not provide adjustment sets, statistical models, or uncertainty estimates in detail.
2secondary dataCharacterize ‘VAT discordance phenotypes’ (low vs high VAT within BMI and WC categories) and quantify testosterone differences within those strata; compare phenotypic groups (e.g., normal-weight/high VAT vs obese/low VAT).cross-sectional stratified phenotype analysisExpand

In plain English

In a cross-sectional analysis of US men (NHANES 2011-2016), investigators defined 'VAT discordance phenotypes' as the lowest vs highest quartile of DXA-derived visceral adipose tissue (VAT) within BMI and waist‑circumference (WC) categories and compared morning total testosterone across these within-category discordant groups. High VAT within BMI or WC strata was associated with substantially lower testosterone than low VAT within the same strata; normal-weight men with high VAT had testosterone levels comparable to obese men with low VAT.

Key findings

  • Within each BMI category (normal-weight, overweight, obese), men in the highest VAT quartile had substantially lower total testosterone than men in the lowest VAT quartile.33–36% lower total testosterone
  • Within waist‑circumference strata, men in the highest VAT quartile had substantially lower total testosterone than men in the lowest VAT quartile.25–39% lower total testosterone
“VAT discordance phenotypes were defined as the lowest vs highest quartile of VAT within BMI and (WC) categories.”
What this piece can’t prove
  • Cross-sectional design reported in abstract limits causal inference between VAT and testosterone.
  • Phenotypes defined by within-category quartiles; abstract does not provide absolute VAT thresholds or adjustment details.
  • Abstract does not report adjustment covariates, statistical model specifics, or confidence intervals for the reported percent differences.

2 further details could not be confirmed from the summary.

3secondary dataAssess association patterns for sex hormone–binding globulin (SHBG) alongside total testosterone in relation to VAT, BMI, and WC.NHANES cross-sectional analysisExpand

In plain English

Abstract of a cross-sectional analysis of 4,948 US men (age 20–59) from NHANES 2011–2016 reports serum total testosterone and sex hormone–binding globulin (SHBG) as main outcomes and uses DXA-derived visceral adipose tissue (VAT), BMI, and waist circumference (WC) as adiposity measures. The abstract reports detailed associations between VAT and total testosterone (strong inverse relationship and percentage differences within BMI/WC strata) but does not report SHBG-specific association results or effect sizes; therefore association patterns for SHBG relative to VAT, BMI, and WC are not provided in the abstract.

Key findings

  • SHBG is listed as a main outcome measure alongside total testosterone, but the abstract does not report SHBG-specific associations with visceral adiposity (VAT), BMI, or WC, so direction and magnitude of any SHBG associations cannot be determined from the abstract.
“MAIN OUTCOME MEASURES: Serum total testosterone and sex hormone-binding globulin.”
What this piece can’t prove
  • Cross-sectional observational design (NHANES) limits inferences about temporality and causality.

2 further details could not be confirmed from the summary.

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 19 candidate papers

And 13 more candidates considered.