{
  "abstract": "Background: Social jetlag, the discrepancy between weekday and weekend sleep timing, is a behavioral marker of circadian timing mismatch and has been linked to obesity, mainly through conventional anthropometric measures. We examined its association with dual-energy X-ray absorptiometry (DXA)-derived adiposity using the nationally representative 2024 Korea National Health and Nutrition Examination Survey (KNHANES). Methods: This cross-sectional study included adults aged ≥40 years reporting usual weekday and weekend bedtimes and wake times. Social jetlag, the absolute difference between weekday and weekend sleep midpoints, was categorized as <1 h, 1– < 2 h, and ≥2 h, with ≥2 h as the primary exposure. The primary outcome was DXA-derived total body fat percentage; subtotal and trunk fat percentages were key secondary outcomes. Height, weight, and waist circumference were obtained by standardized KNHANES examination. Survey-weighted linear regression was adjusted for age, sex, height, average sleep duration, income, education, smoking, alcohol use, physical activity, hypertension, and diabetes. Results: Among 4,483 participants, 267 (6.0%) had social jetlag ≥2 h. In fully adjusted models, this group had higher total body fat percentage (β = 0.81 percentage points; P = 0.025), subtotal fat percentage (β = 0.86; P = 0.025), and trunk fat percentage (β = 1.01; P = 0.036), but not higher BMI or waist circumference. Associations persisted after adjustment for depressive symptoms, but were attenuated and no longer significant after adjustment for a chronotype-related proxy, and were not reproduced when social jetlag was corrected for sleep debt. Sleep duration variability showed no association. Conclusions: Social jetlag ≥2 h was associated with modestly higher DXA-derived total and trunk body fat percentage, differences not captured by BMI or waist circumference. Because the associations did not persist in chronotype-adjusted or sleep-corrected analyses, conventional social jetlag may partly reflect compensatory weekend sleep. These findings are hypothesis-generating and need longitudinal confirmation.",
  "abstract_shown": true,
  "affiliations": [
    "University of Texas Rio Grande Valley School of Medicine, Edinburg, Texas, United States of America",
    "Department of Neurology, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea"
  ],
  "article_type": "Research Article",
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Soojin Kim"
    },
    {
      "affs": [
        1
      ],
      "name": "Heewon Bae"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9wy1dq3jyvfwx.bib",
  "cited_by": 0,
  "doi": "10.1371/journal.pone.0362068",
  "fulltext_url": null,
  "id": "9wy1dq3jyvfwx",
  "issns": [
    "1932-6203"
  ],
  "landing_url": "https://doi.org/10.1371/journal.pone.0362068",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "plos",
      "/Biology and life sciences/Anatomy/Biological tissue/Connective tissue/Adipose tissue"
    ],
    [
      "plos",
      "/Biology and life sciences/Physiology/Physiological parameters/Body weight"
    ],
    [
      "plos",
      "/Biology and life sciences/Physiology/Physiological parameters/Body weight/Obesity"
    ],
    [
      "plos",
      "/Biology and life sciences/Physiology/Physiological processes/Sleep"
    ],
    [
      "plos",
      "/Medicine and health sciences/Anatomy/Biological tissue/Connective tissue/Adipose tissue"
    ],
    [
      "plos",
      "/Medicine and health sciences/Endocrinology/Endocrine disorders/Diabetes mellitus"
    ],
    [
      "plos",
      "/Medicine and health sciences/Medical conditions/Metabolic disorders/Diabetes mellitus"
    ],
    [
      "plos",
      "/Medicine and health sciences/Public and occupational health/Physical activity"
    ],
    [
      "plos",
      "/Physical sciences/Chemistry/Chemical compounds/Organic compounds/Alcohols"
    ],
    [
      "plos",
      "/Physical sciences/Chemistry/Organic chemistry/Organic compounds/Alcohols"
    ],
    [
      "plos",
      "/Physical sciences/Mathematics/Statistics/Statistical methods/Regression analysis/Linear regression analysis"
    ],
    [
      "plos",
      "/Research and analysis methods/Mathematical and statistical techniques/Statistical methods/Regression analysis/Linear regression analysis"
    ]
  ],
  "openalex": null,
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": "Public Library of Science",
  "ris": "https://research.draconitic.com/paper/9wy1dq3jyvfwx.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T12:20:42Z",
      "native_id": "10.1371/journal.pone.0362068",
      "source": "plos",
      "url": "https://doi.org/10.1371/journal.pone.0362068"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "plos:anatomy",
      "subfield": "physiology"
    }
  ],
  "title": "Social jetlag and DXA-derived adiposity in Korean adults: A nationwide study using the 2024 Korea National Health and Nutrition Examination Survey",
  "title_text": "Social jetlag and DXA-derived adiposity in Korean adults: A nationwide study using the 2024 Korea National Health and Nutrition Examination Survey",
  "type": "peer-reviewed",
  "updated_at": "2026-11-07T12:20:24Z",
  "url": "https://research.draconitic.com/paper/9wy1dq3jyvfwx",
  "venue": "PLOS One",
  "versions": []
}