Monday, 26 October 2015

Bacon sandwich hysteria

 

The press are credulously reporting a World Health Organisation report: “Bacon, ham and sausages rank alongside cigarettes as a major cause of cancer, the World Health Organisation has said.”

They add: “Its report says each 50g of processed meat a day - the equivalent of one sausage, or less than two slices of bacon - increases the chance of developing bowel cancer by 18 per cent.”

An increase of 18% sounds very bad, almost as if your lifespan will be reduced by 18%

I know that sensible people would not touch a WHO report with a very long stick for fear of catching something, but this is very silly, even by their standards. They have ranked bacon sandwiches in that category not on their risk, but on the strength of the evidence that there is a very high probability of there being some risk, even if if it is very slight. That is, if WHO are certain that the risk is trivial, it goes into the top category of evidence based statements!

“Global health experts listed processed meat as a cancer-causing substance - the highest of five possible rankings, shared with alcohol, asbestos, arsenic and cigarettes.”

This is stupid, stupid, stupid.

It is part of a mendacious habit in which charities and health groups propagandise relative risks without mentioning absolute risks.

Here is the WHO press release, which gives the relative risk as 18% and without quantifying it further adds that the risk “remains small”. In which case, why the press release?

http://www.iarc.fr/en/media-centre/pr/2015/pdfs/pr240_E.pdf

Gerd Giggerenzer took all this nonsense apart in “Reckoning with Risk” 2002. Please read it again and again.

In fact, since the absolute risk of bowel cancer is low, that low absolute risk has simply become a little bit higher. (I have not looked at all the research: I am taking it on trust at the moment). To put it in context, Dr Ian Johnson, nutrition researcher and Emeritus Fellow, Institute of Food Research, said: " the (meat effect) mechanism is poorly understood, and the effect is much smaller than cigarette smoking on the risk of lung cancer. It is also worth noting that there is little or no evidence that vegetarians in the UK have a lower risk of bowel cancer than meat-eaters.” “Professor Robert Pickard, Emeritus Professor of Neurobiology at the University of Cardiff, highlighted a study of 60,000 Britons last year which found similar levels of bowel cancer in vegetarians and meat-eaters”.

The crude incidence rate in the UK is 65.8 per 100,000. The age-adjusted rate is 47 per 100,000 because cancer is largely an age-related condition. A very nasty thing to have, but as we age the probability of something having to be written on our death certificate increases.

Assume that everyone in the UK is vegetarian (the actual figures reflect the fact that the majority are omnivores already consuming red meat and processed meat) and the worst case scenario is that bacon will raise the age-related incidence rate from 47 to 55.5 per 100,000. Or, take things as they are, ban processed meat, and the age-related incidence rate falls from 47 to 40 per 100,000.

Science journalists: I think I was writing about them only a day ago.

7 comments:

  1. Note how you never hear about the expensive dinners served at WHO functions. Their diets could use review.

    ReplyDelete
  2. "Gerd Giggerenzer took all this nonsense apart in “Reckoning with Risk” 2002."

    My book of the decade for the noughties.

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  3. And while we are at it, the asbestos business is a scandal itself. Brown and Blue asbestos are indeed nasty things, but White asbestos is near as damnit harmless. Mostly it's White asbestos that was used in Britain. Taking out asbestos from buildings is a remarkably lucrative business, mind, and so is being an environmental alarmist, so I don't expect parliamentary attention to this scandal.

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  4. ''Conservatoids'' are morally inept, they live in a world where all kind of absurd are not just tolerated but also treated as ''tradition''. Conservatoids are primitive human boings, poor idiotics, they think they are suuupeeer, a highly evolved breed.

    Real real world. too lazy to be rationally empathetic OR wise.

    Conservatoids accuses most people to be what they are, on average, completely adapted sociopathic.

    If humanity want really evolve, will have to choice the path of rational empathy, different than histrionic narciso-altruism today in the white trash weshtern.

    And one of this beggining will be stop eat meat, but not because conservatoids, on average, want preserve its ''health'' eating DEAD DOMESTICATED, BABY animals.

    - coward
    - intellectually lazy
    - morally inept or anti-matter of wisdom
    - eternal suckers, love suck the balls of its precious ''elites''

    No way to be more captive, idiotic.

    Again, is not because ordinary leftoids are psychotic and dumbs that most of you will be quantitative different, the difference between left and right is not ''who are smarter or any other comparative enfant bullshit'' but the quality of ignorance.

    ReplyDelete
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    ReplyDelete
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