So, what does this mean for you? Right now, nothing. The study naturally has limitations, which Nordström points out; weight and height were all self-reported, there was little information on diet or other potentially related diseases like hypertension, and the data doesn't take into account reasons that the heavier twins may have weighed more. Plus, this is just one study, and 4,000 subjects is relatively few for studying something as prevalent and complex as obesity. However, the researchers suggest that people interested in losing weight should do so to target reducing their risk of diabetes, rather than reducing the risk of heart attacks and death.