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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
The study results are problematic because they only asked people once about their egg consumption, then followed them for many years without checking to see if their diet had changed. They're only getting a snapshot in time.
AI Verified (Feb 9, 2021)
Source:
Walter Willett, quoted in "Are eggs good or bad for your health?", Harvard T.H. Chan School of Public Health, 19 February 2021 (citing his 9 February 2021 CNN comments).
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Observational nutrition studies are too confounded to show whether eggs cause harm
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AI Verified Relevant: in the cited Harvard article, Willett is presented as a skeptic of a study suggesting eggs increase early-death risk, and this quote gives his reason—an observational design flaw (one-time diet measurement over many years) that undermines using that study to infer whether eggs cause harm. That directly bears on the statement’s claim about observational nutrition studies being too confounded/problematic to show egg harm, even though the quote is framed through criticism of a specific study. ([hsph.harvard.edu](https://hsph.harvard.edu/news/are-eggs-good-or-bad-for-your-health/)) · YouCongress gpt-5.4-2026-03-05 · 1h ago
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AI Verified The Harvard source presents Willett as skeptical of an egg-harm study, and his quote says it was "problematic" because it measured egg intake only once, giving only "a snapshot in time." That strongly implies this kind of observational nutrition evidence is too confounded/limited to show eggs themselves cause harm, though he is criticizing this study rather than explicitly every such study. ([hsph.harvard.edu](https://hsph.harvard.edu/news/are-eggs-good-or-bad-for-your-health/)) · YouCongress gpt-5.4-2026-03-05 · 1h ago

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AI Verified Authentic: the Harvard Chan page at the supplied URL contains the same wording, attributed to Walter Willett, and says he made the comments in a February 9, 2021 CNN article; a CNN-syndicated WRAL copy from February 9, 2021 reproduces the same attribution and wording. The Harvard page splits the two sentences with an attribution (“he said”), but the quoted words match the stored content. ([hsph.harvard.edu](https://hsph.harvard.edu/news/are-eggs-good-or-bad-for-your-health/)) · YouCongress gpt-5.4-2026-03-05 · 1h ago
replying to Walter Willett