Butter is good for your heart !!

10 Feb

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This story from last week interested me, as it seemed to contradict all of the health advice we’ve received for years. According to the headline replacing butter with polyunsaturated fat margarine ‘doubles heart risk‘. The story is based on a paper recently published in the British Medical Journal. The first thing that set me thinking was that the study is a reanalysis of missing data from a student conducted with Australian men between 1966 and 1973. Based on this alone it would be interesting to get students to think about whether you could generalise from a sample of Australian men from forty years ago. I may be adopting a dreadful stereotype, but I suspect that the diet of a 1960’s Australian male hugely different from today’s average thus making sensible comparisons rather difficult.

Secondly, the newspaper article is a great example for encouraging students to read all of an article. Towards the end of the article two academics are quoted who clearly don’t think the story has much strength:

Professor Tom Sanders, of King’s College London, said the study was ‘enormously underpowered’, of ‘little relevance to diets today’ and its findings had been refuted by recent better studies.

Professor Brian Ratcliffe, of  Aberdeen University, said: ‘This paper does not provide evidence for changes to the current recommendations for a healthy diet.’

FInally, this story is a lovely example of one of the key points of the rational thinking curriculum/syllabus that I’m trying to assemble. It you read through the reader comments attached to this story you can see the Naturalistic Fallacy at work. Many of the Mail’s readers seem to conclude that it is obvious that butter is more healthy than margarine because butter is ‘natural’ and margarine in ‘manufactured’. A moment’s thought exposes flawed logic of this argument, and yet it is hugely widespread.

It’s of note that the original article is freely available on the BMJ website, and thus for once academic journal paywalls aren’t actively hampering rational thinking !

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