Well, there are quite many reasons for it. People here live a sedentary lifestyle and don't have time to work out. They are busy with their jobs and they hardly have time for themselves. Food also is easily available here which becomes a source of luxury in ceratin terms.

With personal experience, I believe that this phenomenon of obesity is more common in women than in men since women basically have to sit at home and don't have many options when it comes to outdoor activities and excercise.