Note - I edited this post because it was much more crass and reactionary, and realized its not at all my domain, so I rephrased.
Note - I edited this post because it was much more crass and reactionary, and realized its not at all my domain, so I rephrased.
If we are to learn anything from the last 10 years of the replication crisis, it has to be that a single paper is a data point, not a conclusion.
There is a whole field of science dedicated to the statistical analysis of multiple studies in prior literature, e.g. just search for _Meta-analysis_ in the context of medical research.
A state-of-the-art Meta-Analysis is indeed the strongest level of scientific evidence you can have to advise a healthcare decisions or guidelines.
The only purpose of these journals with what they call a high 'impact factor', is that they typically have their peer reviews performed by people who are regarded as the _best_ in the their particular field. Nevertheless, to assume that an expert cannot be conned is also naive.
edit: typo
I highly recommend this elaboration upon that idea: https://slatestarcodex.com/2014/12/12/beware-the-man-of-one-...
As much as we all eagerly drool over and discuss the latest publications -- on this very website! -- in everything from astrophysics to medicine, something being in published in a prestigious journal is not the gold stamp that it is true.
It's just the middle of the process; the reviewers thought it was interesting enough -- and not fraudulent! -- to share with the scientific community at large, and now everyone will examine it, poke holes in it, or try to build on it.
A lot of things are published in journals that end up being wrong. Most of the time it's not fraud, it's just some combination of math errors, experimental errors, and statistical flukes.
And back to the original point: you can find dozens, hundreds of articles published five, ten, twenty years ago that say all sorts of amazing and outlandish things, published in sufficiently minor journals that they didn't receive sufficient attention or follow-up work. Don't take them as gospel just because they got published: you need to study the entire body of scientific research on a subject to understand what the consensus is on what's probably true, what's probably not, and what's in the nebulous zone of unknown.