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    "story_id": "mp-2026-07-25-009",
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    "headline": "A Gut Metabolite Tracks With an Irregular Rhythm",
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    "dek": "Higher TMAO levels were associated with atrial fibrillation and electrical changes in a large clinical cohort and cell studies.",
    "summary": "Higher TMAO levels were associated with atrial fibrillation and electrical changes in a large clinical cohort and cell studies.",
    "body_text": "Cleveland Clinic researchers studied more than 5,000 people undergoing heart procedures and found that higher trimethylamine N-oxide levels were associated with atrial fibrillation. Laboratory experiments also linked TMAO exposure to changes in the electrical environment of heart cells. The clinical finding is observational and does not show that changing diet or TMAO alone will prevent the rhythm disorder.",
    "why_it_matters": "Higher TMAO levels were associated with atrial fibrillation and electrical changes in a large clinical cohort and cell studies.",
    "limitations": [
      "Laboratory experiments also linked TMAO exposure to changes in the electrical environment of heart cells.",
      "The clinical finding is observational and does not show that changing diet or TMAO alone will prevent the rhythm disorder."
    ],
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    "tags": [
      "atrial fibrillation",
      "TMAO",
      "gut microbiome"
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      "source_id": "source-2026-07-25-009",
      "title": "Cleveland Clinic via Newswise: TMAO and atrial fibrillation",
      "publisher": "Cleveland Clinic via Newswise",
      "url": "https://www.newswise.com/articles/cleveland-clinic-researchers-find-link-between-gut-bacteria-byproduct-and-irregular-heart-rhythm",
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    "title": "A Gut Metabolite Tracks With an Irregular Rhythm",
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