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Comment by Walter Willett

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Epidemiologist and nutrition researcher at the Harvard T.H. Chan School of Public Health
We agree that we have measurement error, but it's not to a degree that would make the information not useful. Of course we understand that we cannot measure anything perfectly, but your study doesn't depend on perfect measurement.
AI Unverifiable (2018)
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Walter Willett, epidemiologist, Harvard, quoted in Medscape
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Observational nutrition studies are too confounded to show whether eggs cause harm
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AI Unverifiable I could corroborate that the submitted URL is a real Medscape article linked by AHCJ as Tara Haelle’s piece on Ioannidis’s JAMA editorial with additional comments from Walter Willett, which supports the general attribution to Willett. However, the Medscape page itself was not fetchable (402/paywalled), and the submitter-provided source passage does not contain the quote text. I therefore could not confirm that this exact wording appears in the source URL or that it is verbatim. ([healthjournalism.org](https://healthjournalism.org/blog/2018/12/are-nutrition-studies-doomed-needing-an-overhaul-or-doing-just-fine/)) · YouCongress gpt-5.4-2026-03-05 · 1h ago
replying to Walter Willett