Exercising in middle age can offset the harms of being obese, a major study suggests. The research – which implies it is possible to be both fat and fit – undermines the theory that obesity automatically leads to ill-health. The team found that if people were both overweight and inactive, they were a third more likely to suffer a heart attack or stroke than if they were of a healthy weight and exercised. But overweight people were able to wipe out this risk if they were active for at least four hours a day.
http://www.dailymail.co.uk/health/article-4273438/You-fat-healthy.html