They noticed that, although the popularity of dietary supplements was increasing, levels of general health had remained the same.

And, inspired by the observation that a colleague chose an unhealthy meal over an organic dish simply because he taken a multivitamin earlier in the day, Wen-Bin Chiou  of National Sun Yat-Sen University in Taiwan decided to research  the topic.

One group of volunteers was told to take a multivitamin pill and the second a dummy pill while their lifestyle choices were monitored.

In reality, both groups had been given placebos.

The researchers found that those who believed they had taken a supplement felt immune to health hazards and were less likely to go for a walk to benefit their health.

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