As miracle cures are hard to come by, any claims that a treatment is 100% safe and effective must always be viewed with intense scepticism. There is perhaps one exception. Physical activity has been called a miracle cure by no less a body than the Academy of Medical Sciences (http://bit.ly/2lTqDvc); and, like those who avail themselves of it, the supporting science grows stronger by the day. The BMJ recently published a systematic review showing a clear dose-response relation between physical activity and all cause mortality (doi:10.1136/bmj.l4570). The authors concluded that any level of activity is better than none, and more is better still, a message recently encapsulated in the updated guidelines from the UK’s chief medical officers (doi:10.1136/bmj.l5470).The statement from the authors on their analysis of numerous studies:
We conducted a harmonised meta-analysis to examine the association between accelerometer measured physical activity and sedentary time and all cause mortality. Specifically, we examined the dose-response relations of total physical activity, different intensities of physical activity (light, low light, high light, moderate to vigorous, and vigorous) and sedentary time and all cause mortality.