Multifactorial trials: taking apart the kitchen sink

Peter Attia · 15 Aug 2026 · peterattiamd.com ↗

3 korrents from this piece

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Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.

Our reading
A trial that changes ten things at once cannot tell you which of them worked.

Their wordsThe one thing we absolutely cannot say, from a trial designed this way, is that any single component, on its own, lowered blood pressure.

Interesting
Our reading
Being part of a package that worked does not make a component causal, or even relevant.

Their wordsBeing included in a successful package does not make something causal.

Interesting
Our reading
A study should be interpreted at exactly the level of certainty its design supports, no higher and no lower.

Their wordsEvery study deserves to be interpreted at exactly the level of certainty its design can support.

Interesting