It's a fairly simple question. Alternatively, do you think that asbestos causes mesothelioma? Or that seatbelts prevent death in car accidents?
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Replying to @GidMK
My entire career people have sought to draw comparative "policy" and "science" to food. "Food" is a bounded entity bc "humans need it to survive". Anything else you throw at me from the "but epidemiology" bucket that is not "food" is going to waste both our time.
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Replying to @WeDietitians
Sorry, but this isn't about theory. If you don't think Grade C evidence should EVER be used to inform clinical practice, then that should apply to all statements
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Replying to @GidMK
"Sorry, this isn't about theory"..... can you expand? eg why "sorry", what is "this"...and if not "theory" then what is it?
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Replying to @WeDietitians
Sure. This is the practical application of a theoretical construct. You can decide that a certain grade of evidence is not sufficient - against the NHMRC recommendations - but applying it inconsistently makes no sense. You should apply it to all areas of evidence
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Replying to @GidMK @WeDietitians
The level of evidence for tobacco-related harms is never above Grade C (perhaps Grade B in some very specific cases), because you cannot run an RCT on cigarette smoking. Similarly with mesothelioma and seatbelts
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Replying to @GidMK @WeDietitians
So if you reject all Grade C evidence, which is, I would argue, a methodologically unsound method of evidence appraisal, you should similarly be demanding furiously the RCT evidence that cigarettes cause harm and that asbestos is bad
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Replying to @WeDietitians
As I said, it's Grade C The point being that Grade C evidence can be and is used to inform policy decisions
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Replying to @GidMK
Right ok - so you’re saying all Grade C is equal? And I guess “at a glance” it could be. So let’s just take that as is for a moment. The next step is, is Grade C enough evidence to instruct a population? You say “yes we do it all the time”.
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We do indeed. Seatbelts, smoking and asbestos are all examples 
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