There are many reasons why many couples put on weight after marriage. This happens not just in India. Even international scientific studies say so. A 2015 research which surveyed 10226 respondents in Austria France Germany Italy the Netherlands Poland Russia Spain and the United Kingdom found that married couples on average eat better than singles but that they also weigh significantly more and do less sport. The couples in the study were found to have a higher body mass index than singles -- whether men or women. Another study by the University of Bath’ School of Management in the UK