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A study of 802 teens raises questions about school breakfast and blood sugar (opens in a new tab)

news-medical.net · 2026-10-22

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.

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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
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 breakfast association was no longer statistically significant after correction for multiple comparisons.View evidenceHide evidence

Why this verdict

The abstract-level profile reports the breakfast association as PR 1.30, 95% CI 1.01–1.66, but it does not report multiple-comparison correction results or state that the association became non-significant after such correction. This may be a full-text detail, but it is not verifiable from the supplied abstract-depth profile.

1

Study evidence

School breakfast participation (at least once per week) was associated with higher prevalence of prediabetes in U.S. adolescents in adjusted models.PR 1.30 (95% CI 1.01–1.66)

“National Health and Nutrition Examination Survey data (2017-2020, 2021-2023) were analyzed, including adolescents (aged 12-18 years) with complete fasting glucose and HbA1c data (n = 802).”
Claim 2 of 5Not coveredThe authors said the findings do not show that school breakfast causes prediabetes and that the study did not directly assess school meal composition.View evidenceHide evidence

Why this verdict

The non-causation portion is supported by the cross-sectional NHANES design and profile limitations stating that causal inference and temporality cannot be established. However, the supplied abstract-depth profile does not verify that the authors said the study did not directly assess school meal composition. Because the claim combines a supported limitation with a statement not available at this depth, the full claim is not verifiable at abstract depth.

1

Study evidence

School breakfast participation (at least once per week) was associated with higher prevalence of prediabetes in U.S. adolescents in adjusted models.PR 1.30 (95% CI 1.01–1.66)

“National Health and Nutrition Examination Survey data (2017-2020, 2021-2023) were analyzed, including adolescents (aged 12-18 years) with complete fasting glucose and HbA1c data (n = 802).”
Claim 3 of 5SupportedResearchers investigated associations between school meal participation, dietary intake, and prediabetes prevalence among U.S. adolescents using NHANES data.View evidenceHide evidence

Why this verdict

The abstract-level profile supports that this was a cross-sectional NHANES 2017–2023 analysis of adolescents ages 12–18 that evaluated associations between school meal participation, dietary intake, and prediabetes using multivariable modified Poisson regression.

1

Study evidence

School breakfast participation (at least once per week) was associated with higher prevalence of prediabetes in U.S. adolescents in adjusted models.PR 1.30 (95% CI 1.01–1.66)

“National Health and Nutrition Examination Survey data (2017-2020, 2021-2023) were analyzed, including adolescents (aged 12-18 years) with complete fasting glucose and HbA1c data (n = 802).”
2

Study evidence

Higher vitamin E intake was associated with lower prevalence of prediabetes.PR 0.96 (95% CI 0.94–0.99)

“Multivariable modified Poisson regression models evaluated associations between ... dietary intake (food groups and nutrients), and prediabetes.”
Claim 4 of 5SupportedIn the study of 802 adolescents ages 12 to 18, school breakfast participation at least once per week was associated with a 30% higher prediabetes prevalence compared with nonparticipation.View evidenceHide evidence

As stated30% higher

Why this verdict

The profile reports n=802 adolescents ages 12–18 and a school breakfast participation association with higher prediabetes prevalence, PR 1.30 with 95% CI 1.01–1.66. Framing this as an association and translating PR 1.30 as about 30% higher prevalence is consistent with the abstract-level evidence.

1

Study evidence

School breakfast participation (at least once per week) was associated with higher prevalence of prediabetes in U.S. adolescents in adjusted models.PR 1.30 (95% CI 1.01–1.66)

“National Health and Nutrition Examination Survey data (2017-2020, 2021-2023) were analyzed, including adolescents (aged 12-18 years) with complete fasting glucose and HbA1c data (n = 802).”
Claim 5 of 5SupportedSchool lunch participation showed no statistically significant relationship with adolescent prediabetes.View evidenceHide evidence

Why this verdict

The abstract-level profile states that school lunch participation was not associated with prediabetes prevalence in adjusted analyses. The story’s hedged, associational framing is consistent with that evidence.

1

Study evidence

School breakfast participation (at least once per week) was associated with higher prevalence of prediabetes in U.S. adolescents in adjusted models.PR 1.30 (95% CI 1.01–1.66)

“National Health and Nutrition Examination Survey data (2017-2020, 2021-2023) were analyzed, including adolescents (aged 12-18 years) with complete fasting glucose and HbA1c data (n = 802).”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Dietary-intake findings: higher vitamin E and vitamin B6 intakes were associated with lower prediabetes prevalence, and higher fruit intake was inversely associated with prediabetes among adolescents with obesity.

    The story says dietary intake was investigated but does not report the abstract-level dietary findings for vitamins E/B6 or fruit intake among adolescents with obesity. These are primary paper results in the profile and are therefore materially under-covered.

    From Cross-sectional secondary analysis (NHANES 2017–2023)

  • Descriptive prevalence context: prediabetes prevalence was 33.8% and obesity prevalence was 20.96% in the analytic sample.

    The story focuses on school meal associations and does not mention the reported prediabetes or obesity prevalence estimates, which the profile identifies as supporting descriptive results.

    From NHANES secondary survey-weighted prevalence estimation (cross-sectional)

7 things the story did carry across
  • Study design and population: cross-sectional NHANES 2017–2023 analysis of U.S. adolescents ages 12–18 with complete fasting glucose and HbA1c data, n=802.
  • Primary school-meal finding: school breakfast participation at least once per week was associated with higher prediabetes prevalence, PR 1.30, 95% CI 1.01–1.66.
  • School lunch finding: school lunch participation was not associated with prediabetes prevalence in adjusted analyses.
  • Causal limitation: cross-sectional NHANES associations cannot establish causality or temporality.
  • Measurement limitations: dietary intake and school meal participation may be subject to measurement error; abstract-level details of dietary assessment are limited.
  • Outcome limitation: prediabetes was based on HbA1c and/or fasting glucose values at a single NHANES time point, reflecting laboratory-range values rather than longitudinal clinical diagnosis.
  • Multiple-comparison correction result claimed by the story.
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

secondary data

1Lead resultsecondary dataEstimate nationally representative prediabetes prevalence among U.S. adolescents (2017–2023 NHANES) and assess cross-sectional associations between school meal participation (breakfast/lunch) and prediabetes.NHANES cross-sectional secondary data analysisExpand

In plain English

Cross-sectional analysis of NHANES 2017–2020 and 2021–2023 (adolescents aged 12–18 years, n=802 with complete fasting glucose and HbA1c) estimating nationally representative prediabetes prevalence and assessing associations between school meal participation (breakfast, lunch), overall dietary intake, and prediabetes using multivariable modified Poisson regression. Key findings: prediabetes prevalence was 33.8%; school breakfast participation (≥1×/week) was associated with higher prediabetes prevalence (PR 1.30, 95% CI 1.01–1.66), while school lunch was not; higher intakes of vitamin E and B6 were associated with lower prediabetes prevalence; higher fruit intake was inversely associated with prediabetes among adolescents with obesity.

Key findings

  • School breakfast participation (at least once per week) was associated with higher prevalence of prediabetes in U.S. adolescents in adjusted models.PR 1.30 (95% CI 1.01–1.66)
  • School lunch participation was not associated with prediabetes prevalence in the adjusted analyses.
“National Health and Nutrition Examination Survey data (2017-2020, 2021-2023) were analyzed, including adolescents (aged 12-18 years) with complete fasting glucose and HbA1c data (n = 802).”
What this piece can’t prove
  • Abstract provides limited detail on covariate adjustment set, survey weighting, and handling of missing data beyond sample restriction to those with complete fasting glucose and HbA1c.
  • Dietary intake and school meal participation measures may be subject to measurement error (details of dietary assessment not provided in abstract).
  • Reported results are based on the analytic subset (n=802); subgroup and nutrient-specific analyses may have limited power.

2 further details could not be confirmed from the summary.

2secondary dataAssess cross-sectional associations between overall dietary intake (food groups and nutrients) and prediabetes, including effect modification by obesity status.Cross-sectional secondary analysis (NHANES 2017–2023)Expand

In plain English

Cross-sectional analysis of NHANES 2017–2023 adolescents (age 12–18, n=802) examining associations between overall dietary intake (food groups and nutrients) and prediabetes (defined by fasting glucose and/or HbA1c in the prediabetes range), with assessment of effect modification by obesity status. Multivariable modified Poisson regression was used to estimate adjusted prevalence ratios. Higher intakes of vitamin E and vitamin B6 were associated with lower prediabetes prevalence overall; higher fruit intake was associated with lower prediabetes prevalence among adolescents with obesity. Prediabetes prevalence in the analytic sample was 33.8% (SE 3.0).

Key findings

  • Higher vitamin E intake was associated with lower prevalence of prediabetes.PR 0.96 (95% CI 0.94–0.99)
  • Higher vitamin B6 intake was associated with lower prevalence of prediabetes.PR 0.90 (95% CI 0.81–0.99)
“Multivariable modified Poisson regression models evaluated associations between ... dietary intake (food groups and nutrients), and prediabetes.”
What this piece can’t prove
  • Cross-sectional NHANES analysis—associations do not establish causality; temporal ordering cannot be inferred.
  • Analytic sample limited to adolescents with complete fasting glucose and HbA1c data (n = 802), which may affect precision and generalizability.
  • Authors note that confirmation is needed (findings require replication/confirmation).
3secondary dataDescribe sample characteristics and key prevalences (prediabetes, obesity) in the analytic NHANES adolescent sample with fasting glucose and HbA1c data.NHANES secondary survey-weighted prevalence estimation (cross-sectional)Expand

In plain English

In a nationally representative NHANES-derived analytic sample of adolescents aged 12–18 years with complete fasting glucose and HbA1c (n = 802; 2017–2023 cycles), the authors report a prediabetes prevalence of 33.8% (SE 3.0) and an obesity prevalence of 20.96% (SE 1.44) as descriptive results.

Key findings

  • Prediabetes prevalence in the analytic NHANES adolescent sample (12–18 years with fasting glucose and HbA1c) was 33.8% (SE 3.0).33.8% (SE 3.0)
  • Obesity prevalence in the same analytic sample was 20.96% (SE 1.44).20.96% (SE 1.44)
“Prediabetes prevalence was 33.8% (SE 3.0) and obesity prevalence was 20.96% (SE 1.44).”
What this piece can’t prove
  • Analytic sample restricted to adolescents with complete fasting glucose and HbA1c (n = 802), which may affect representativeness relative to the full NHANES adolescent population.
  • Cross-sectional design; prevalence estimates do not convey temporality or causal relationships.

2 further details could not be confirmed from the summary.

Finally, the search trail

Method layer

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Open the paper in Tessa

School Meal Participation, Overall Dietary Intake, and Prediabetes Prevalence Among U.S. Adolescents: Insights From the National Health and Nutrition Examination Survey (2017-2023).

Diabetes, obesity, and cardiometabolic CARE · 2026

Deep dive in Tessa (opens in a new tab)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.

PubMed, Crossref, Europe PMC · 15 candidate papers

Selected

School Meal Participation, Overall Dietary Intake, and Prediabetes Prevalence Among U.S. Adolescents: Insights From the National Health and Nutrition Examination Survey (2017-2023).

Diabetes, Obesity, and Cardiometabolic CARE · 2026 · PubMed

Tessa (opens in a new tab)Source (opens in a new tab)
Candidate

Association of the Healthy Eating Index (HEI) Score of Children Enrolled in School Lunch and Breakfast Program and Frequency of Meals at School: NHANES 2015–2016

Current Developments in Nutrition · 2020 · Crossref

Source (opens in a new tab)

And 9 more candidates considered.