By Matthew Warren

Millions of people around the world spend time and money on healthcare remedies that mainstream science considers ineffective (in the sense of being no more effective than a placebo), like homeopathy and acupuncture. A study published recently in Psychology and Health investigated how to address this issue in the context of multivitamins, which evidence suggests provide no benefit for healthy people – and may even cause harm in some contexts. 

Despite this research evidence, huge numbers of healthy people take multivitamins because they appear to be helpful. Scientists refer to this as the “illusion of causality”: when someone takes a vitamin and then their cold goes away, for example, they may believe it was the vitamin that cured them, even though they would have recovered just as quickly anyway. Past research has shown that simply giving people the raw outcomes of clinical trials that show remedies to be ineffective does not necessarily help combat this problem, perhaps because the data can involve large numbers and complex findings, which are difficult for the public to interpret. 

Douglas MacFarlane and colleagues from the University of Western Australia have explored how to better inoculate people against this illusion. The researchers report that people need to be told clearly about the proportion of people who benefit from the remedy versus taking a placebo – and this data has to be accompanied by a scientific explanation for why the remedy is ineffective.

Continue reading “How To Combat The “Illusion Of Causality” That Contributes To So Many Healthy People Taking Multivitamin Pills They Don’t Need” →

By Christian Jarrett

Asking patients to draw the parts of their body affected by illness (and similar drawing challenges) can provide insights into how they think about their illness, the seriousness of their condition, and how well they are likely to cope, among other things. For instance, when people who had experienced a heart attack were asked on repeated occasions to draw their heart, an increase in the size of their drawings over time correlated with more anxiety and a slower return to work.

This example and many others feature in a new paper in Health Psychology Review that’s charted the use of patient drawings in peer-reviewed research, finding that the approach has increased in popularity in recent years. From 1970 to 2002, the average number of papers involving patient drawings published per year was 0.5, whereas that increased to an average of 5.9 per year between 2003 and 2016. In all, Elizabeth Broadbent at the University of Auckland, and her colleagues found 101 relevant studies covering 27 categories of illness (most often cancer) and involving participants from 29 different countries, from Canada to Zimbabwe. “We can utilise patients’ drawings to improve our understanding of the illness experience and inform our clinical interventions,” they said.

Continue reading “Asking Patients To Draw Their Illness Can Be Surprisingly Revealing” →