MedicalResearch.com: What is the background for this study?
Response: The role of excess body weight on mortality has been extensively investigated during the last decades. Studies from several countries have also shown, however, that the risk of death in persons who are overweight or obese is lower if their fitness, a parameter indicating cardio-pulmonary health, is higher.
Most of these studies reported the beneficial effect of fitness in terms of relative risk reduction, for example 20% reduction of risk of death. Relative estimates, though, are difficult to interpret. Continue reading