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    "story_id": "mp-2026-07-13-009",
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    "headline": "Eighty Minutes Less Sleep Added a Pound",
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    "dek": "In pooled randomized trials, 95 adults gained about one pound and became more sedentary after six weeks of modest sleep restriction.",
    "summary": "In pooled randomized trials, 95 adults gained about one pound and became more sedentary after six weeks of modest sleep restriction.",
    "body_text": "Columbia researchers pooled randomized crossover trials in which 95 adults followed their normal sleep schedule and, in another six-week period, delayed bedtime by 90 minutes. Wrist monitors showed roughly 80 minutes less sleep, an average one-pound weight gain, and 17 more sedentary minutes per day. The experiment supports a short-term causal effect under controlled conditions; it does not establish how much weight any individual would gain over a year or replace diet and activity evidence.",
    "why_it_matters": "In pooled randomized trials, 95 adults gained about one pound and became more sedentary after six weeks of modest sleep restriction.",
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      "The experiment supports a short-term causal effect under controlled conditions; it does not establish how much weight any individual would gain over a year or replace diet and activity evidence."
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    "first_published_at": "2026-07-13T09:00:00.000-04:00",
    "modified_at": "2026-07-13T13:08:06.310-04:00",
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        "text": "In pooled randomized trials, 95 adults gained about one pound and became more sedentary after six weeks of modest sleep restriction.",
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        "qualification": "The experiment supports a short-term causal effect under controlled conditions; it does not establish how much weight any individual would gain over a year or replace diet and activity evidence."
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    "tags": [
      "sleep",
      "weight",
      "randomized trial",
      "health"
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  "sources": [
    {
      "source_id": "source-2026-07-13-009",
      "title": "ScienceDaily from Columbia University Irving Medical Center",
      "publisher": "ScienceDaily",
      "url": "https://www.sciencedaily.com/releases/2026/07/260713000800.htm",
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      "published_at": "2026-07-12T20:00:00.000-04:00",
      "accessed_at": "2026-07-13T12:50:42.743-04:00",
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  "cite_this_report": {
    "title": "Eighty Minutes Less Sleep Added a Pound",
    "publisher": "The Machine Press",
    "published_at": "2026-07-13T09:00:00.000-04:00",
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