The phrase a study says is doing an enormous amount of unearned work.
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Sample size and selection decide what a health finding can support, and both are usually the first details removed when a study becomes a story. A result from a few dozen participants in a controlled setting is not a population-level claim, however confidently it is repeated.
Replication is scored separately because in several fields a single unreplicated result is weak evidence, and the popular version rarely mentions that no one has reproduced it.
Nothing here is medical advice. It is a reading of what the evidence establishes and where its public use has gone past that.
No. It scores the strength and use of public claims. Decisions about your health belong with a qualified clinician.
Because an unreplicated single result is a starting point, not a conclusion, and the distinction almost never survives into the headline.
When they reach the scale where people are making decisions on them, yes.
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