The research, which is the first to show the causal effect of obesity on medical care costs, uses new methods and makes a stronger case for government intervention to prevent obesity. Obesity raises the risk of cancer, stroke, heart attack and diabetes. For any type of surgery, there are complications with anesthesia, with healing [for the obese]. … Obesity raises the costs of treating almost any medical condition. It adds up very quickly. The research provides hard evidence for policymakers to use in cost–effectiveness analysis when deciding whether and how much to fund obesity prevention programs.