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Choice of Tea or Coffee Might Affect Risk of Osteoporosis in Older Women : ScienceAlert (opens in a new tab)

sciencealert.com · 2026-10-02

Short answerEvidenceSource

Short answer

Mixed

Mixed.

2 claims go further than the study. 2 other points were not covered by the paper.

  • 2 supported
  • 2 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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Follow the evidence trail
1
2

NewsLink checks it

Mixed

Two of six claims overstate the study. Two of six check out. Two claims the study doesn't address.

  • 2 supported
  • 2 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.

6 claims in this story

Showing all 6 claimsChoose a verdict to focus the list.

Claim 1 of 6OverstatedA recent study suggests that daily decisions between tea or coffee could make a big difference to women's bone health.View evidenceHide evidence

Why this verdict

The paper profile supports modest observational associations: tea was associated with a very small higher total hip BMD, coffee was overall not significantly associated with hip BMD, and only spline analyses suggested possible lower BMD above >5 cups/day. Framing everyday tea-versus-coffee choices as potentially making a “big difference” overstates the magnitude and certainty, especially from observational evidence; the lead language outruns the more cautious body framing.

1

Study evidence

Tea consumption was associated with a small positive difference in total hip BMD over follow-up.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p = 0.026

“Data were drawn from the Study of Osteoporotic Fractures (SOF), a prospective cohort of 9704 women aged ≥65 years.”
2

Study evidence

Tea consumption was positively associated with total hip BMD over ~10 years.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p=0.026

“Nonlinear relationships were assessed using natural splines…”
Claim 2 of 6OverstatedDrinking any amount of coffee was associated with reduced femur BMD in women who drank higher amounts of alcohol in their lifetimes.View evidenceHide evidence

As statedany amount of coffee

Why this verdict

The profile supports an interaction finding: coffee consumption was negatively associated with femoral neck BMD among women with higher alcohol intake, with a coffee×alcohol interaction p=0.0147. But the story’s “any amount of coffee” is broader than the abstract-level evidence provided, which gives no subgroup dose estimates or confirmation that every nonzero coffee level was associated with reduced BMD. The “higher amounts of alcohol in their lifetimes” wording is also not verified in the supplied abstract profile.

1

Study evidence

Tea consumption was positively associated with total hip BMD over follow-up.Mean difference 0.003 g/cm² (least squares mean 0.718 vs. 0.715 g/cm²); 95% CI 0.000–0.005; p = 0.026

“subgroup analyses were conducted using exposure-by-covariate interaction terms.”
Claim 3 of 6Not coveredPublic health researchers from Flinders University analyzed the tea- and coffee-drinking habits of roughly 9,700 US women aged over 65 years as part of a broader osteoporosis study published in 2025.View evidenceHide evidence

As statedroughly 9,700 women aged over 65 years

Why this verdict

The abstract-level profile supports the core study description: SOF cohort, 9704 women aged ≥65 years, repeated coffee/tea questionnaires and hip BMD measures over about 10 years. However, the supplied paper profile does not verify the Flinders University affiliation, publication year, or explicitly that participants were US women, so those parts are not verifiable at this depth.

1

Study evidence

Tea consumption was associated with a small positive difference in total hip BMD over follow-up.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p = 0.026

“Data were drawn from the Study of Osteoporotic Fractures (SOF), a prospective cohort of 9704 women aged ≥65 years.”
Claim 4 of 6Not coveredThe article cautions that the women in the study were mostly White, so the results may not generalize to broader populations.View evidenceHide evidence

Why this verdict

The profile supports a generalizability limitation for older/postmenopausal women in the SOF cohort and other populations, but it does not state at abstract depth that participants were mostly White. The general caution about limited generalizability is supported, while the specific race-composition basis is not verifiable from the supplied profile.

1

Study evidence

Tea consumption was associated with a small positive difference in total hip BMD over follow-up.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p = 0.026

“Data were drawn from the Study of Osteoporotic Fractures (SOF), a prospective cohort of 9704 women aged ≥65 years.”
2

Study evidence

Tea consumption was positively associated with total hip BMD over ~10 years.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p=0.026

“Nonlinear relationships were assessed using natural splines…”
Claim 5 of 6SupportedWomen who regularly drank tea tended to have slightly but significantly higher hip BMD than those who did not.View evidenceHide evidence

As statedslightly but significantly higher hip BMD

Why this verdict

Supported. The profile reports tea consumption was positively associated with total hip BMD with a small but statistically significant mean difference of 0.003 g/cm², 95% CI 0.000–0.005, p=0.026. The story’s “slightly” and associational wording are consistent with the abstract-level evidence.

1

Study evidence

Tea consumption was associated with a small positive difference in total hip BMD over follow-up.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p = 0.026

“Data were drawn from the Study of Osteoporotic Fractures (SOF), a prospective cohort of 9704 women aged ≥65 years.”
2

Study evidence

Tea consumption was positively associated with total hip BMD over ~10 years.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p=0.026

“Nonlinear relationships were assessed using natural splines…”
Claim 6 of 6SupportedCoffee habits had mixed results: women who drank more than five cups of coffee per day were more likely to have lower BMD.View evidenceHide evidence

As statedmore than five cups of coffee per day

Why this verdict

Supported with the story’s hedging. The profile says overall coffee intake was not significantly associated with femoral neck or total hip BMD, but spline analyses suggested consuming more than five cups/day may be associated with lower BMD. The phrase “mixed results” appropriately reflects the overall null plus high-intake spline signal.

1

Study evidence

Tea consumption was associated with a small positive difference in total hip BMD over follow-up.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p = 0.026

“Data were drawn from the Study of Osteoporotic Fractures (SOF), a prospective cohort of 9704 women aged ≥65 years.”
2

Study evidence

Tea consumption was positively associated with total hip BMD over ~10 years.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p=0.026

“Nonlinear relationships were assessed using natural splines…”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Overall coffee consumption showed no significant association with femoral neck or total hip BMD in the primary analyses.

    The story says coffee results were mixed and notes high-intake/subgroup concerns, but it does not clearly report the important primary null finding. Omitting this can make coffee appear more consistently harmful than the abstract-level paper profile indicates.

    From Prospective cohort repeated-measures analysis (SOF); prospective cohort repeated-measures spline analysis; Prospective c

  • Interaction analysis also reported tea×BMI effect modification, with tea appearing particularly beneficial among women with obesity.

    The presented story claims and caveats do not mention the BMI/obesity interaction, even though it is a reported secondary interaction finding in the profile.

    From Prospective cohort repeated-measures interaction analysis

7 things the story did carry across
  • Prospective observational repeated-measures SOF cohort of 9704 women aged ≥65 years with repeated coffee/tea questionnaires and repeated DXA hip BMD over about 10 years.
  • Tea consumption was associated with a small positive difference in total hip BMD, not a large or clearly clinically meaningful effect.
  • Spline analyses suggested coffee intake greater than five cups/day may be associated with lower BMD, but the abstract provides no numeric effect estimate, uncertainty interval, or robustness details for this threshold.
  • Interaction analysis suggested coffee associations differed by alcohol intake, with a negative association for femoral neck BMD among women with higher alcohol intake; subgroup effect sizes are not provided in the abstract.
  • Observational design limits causal inference and leaves potential residual confounding.
  • Self-reported beverage intake may introduce measurement error or misclassification.
  • Generalizability is limited because the cohort consisted of older/postmenopausal women; applicability to men, younger people, and other populations is uncertain.
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 vivoEstimate longitudinal associations of coffee and tea consumption with repeated-measures hip BMD (femoral neck and total hip) over ~10 years in older/postmenopausal women in the SOF cohort.Prospective cohort repeated-measures analysis (SOF)Expand

In plain English

Repeated-measures analysis of coffee and tea intake and hip BMD over ~10 years in 9704 women ≥65 years from the Study of Osteoporotic Fractures (SOF). Tea intake was modestly positively associated with total hip BMD; overall coffee intake showed no significant association but spline results suggested possible lower BMD at >5 cups/day. Interaction analyses indicated heterogeneous associations by alcohol use (coffee) and BMI (tea). Analyses used linear mixed-effects models with random intercepts and adjustment for demographics, physical activity, comorbidities, and medication use.

Key findings

  • Tea consumption was associated with a small positive difference in total hip BMD over follow-up.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p = 0.026
  • No significant overall association between coffee consumption and femoral neck or total hip BMD was observed in primary analyses.
“Data were drawn from the Study of Osteoporotic Fractures (SOF), a prospective cohort of 9704 women aged ≥65 years.”
What this piece can’t prove
  • Observational cohort analysis — cannot establish causality and is susceptible to residual confounding.
  • Beverage intake was self-reported (questionnaires) which may introduce measurement error or misclassification.
  • Reported effect sizes (where present) are small; clinical significance is uncertain.
  • Findings are in older, postmenopausal women (SOF cohort) and may not generalize to other populations.
2human in vivoEvaluate potential nonlinear dose–response relationships between coffee/tea intake and BMD (e.g., thresholds such as >5 cups/day coffee) using spline modeling.prospective cohort repeated-measures spline analysisExpand

In plain English

In a repeated-measures analysis of the Study of Osteoporotic Fractures cohort (N=9,704 women ≥65 y) spanning ~10 years, the authors used linear mixed-effects models with repeated assessments of coffee/tea intake (self-reported at visits 2, 4, 5, 6) and DXA-measured femoral neck and total hip BMD to evaluate associations. Nonlinear dose–response relationships were assessed using natural splines; results reported a small positive association between tea intake and total hip BMD (LS mean difference 0.003 g/cm2, 95% CI 0.000–0.005, p=0.026) and noted that spline analyses suggested consumption of >5 cups/day of coffee may be associated with lower BMD. Significant exposure-by-covariate interactions were reported for coffee × alcohol intake and tea × BMI.

Key findings

  • Tea consumption was positively associated with total hip BMD over ~10 years.Mean difference 0.003 g/cm2 (95% CI 0.000–0.005); p=0.026
  • Overall coffee consumption showed no significant association with femoral neck or total hip BMD in the main mixed-effects models.
“Nonlinear relationships were assessed using natural splines…”
What this piece can’t prove
  • Abstract does not report spline model details (knots, degrees of freedom, reference ranges), limiting assessment of the nonlinear modeling choices.
  • Beverage intake was self-reported via questionnaires, subject to recall and misclassification bias; frequency/serving size definitions not provided in abstract.
  • Observational design: potential residual confounding and inability to establish causality.
  • Study population limited to older postmenopausal women (SOF), which may limit generalizability to other ages, men, or non-postmenopausal populations.
  • Abstract does not state whether random slopes, time-varying covariates, or sensitivity analyses (e.g., for reverse causation or missing data) were used.

1 further detail could not be confirmed from the summary.

3human in vivoAssess effect modification (subgroup/interaction) for coffee/tea–BMD associations by covariates such as alcohol intake and BMI using interaction terms.Prospective cohort repeated-measures interaction analysisExpand

In plain English

In repeated-measures analyses of older women in the Study of Osteoporotic Fractures, the authors tested exposure-by-covariate interaction terms to assess effect modification of coffee– and tea–BMD associations by alcohol intake and BMI. They report significant interactions (coffee×alcohol p=0.0147; tea×BMI p=0.0175) and interpret these as coffee being negatively associated with femoral neck BMD among women with higher alcohol intake and tea being particularly beneficial for women with obesity.

Key findings

  • Tea consumption was positively associated with total hip BMD over follow-up.Mean difference 0.003 g/cm² (least squares mean 0.718 vs. 0.715 g/cm²); 95% CI 0.000–0.005; p = 0.026
  • No significant overall association between coffee consumption and femoral neck or total hip BMD was reported in primary models.
“subgroup analyses were conducted using exposure-by-covariate interaction terms.”
What this piece can’t prove
  • Exposure (coffee/tea) measured by self-administered questionnaire — potential for measurement error and misclassification.
  • Abstract does not provide subgroup sample sizes, direction/magnitude of subgroup-specific estimates, or adjustment details specific to interaction models.
  • Observational repeated-measures analyses are subject to residual confounding and cannot establish causality.

1 further detail 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

Candidate

The Green Tea Catechin, EGCg, Preserves Both Muscle and Bone in Aging Sarcopenic Rats

The FASEB Journal · 2020 · Crossref

Source (opens in a new tab)

And 13 more candidates considered.