Read about it in this BBC News item. But you can be sure that the fact that obesity is not caused by inactivity will not stop people, including many 'obesity experts', from continuing to urge overweight/obese people to take more exercise in order to lose weight, or to combine exercise with dieting. They are not interested in evidence or in facts. They have been conditioned to believe, despite lack of supporting evidence, that obesity is caused by a surfeit of calories. They believe that the marvellously complex human body and the multitude of many-faceted problems caused by obesity, can be explained by a bit of arithmetic about calories in and calories out. - Beware these simpletons! They are never sated. - If you don't do as they say (i.e. eat less and move more), you are lazy and greedy. If you do do as they say and it doesn't work (because it doesn't work!) then they will tell you you are a liar, or you did it wrong. They are themselves too lazy to read the research evidence.
Read my Mensa article on Obesity and the Salt Connection
How to lose excess weight safely and easily without bothering about calories at all.