I could begin.
In the material we provided there's a recent study showing an annual cost of about $4 billion, but I think that's an underestimate. Part of what we're worried about--and where I work our lens is a chronic disease lens--is the kind of disease that obesity is going to lead to, such as diabetes, heart disease, high blood pressure, arthritis, etc. So it's difficult to capture that actual real cost because it needs to be measured over a lifetime of exposure. So from a cost-benefit perspective, I think more work needs to be done. Someone suggested that it is very cost effective to prevent disease before it comes on.
In terms of reduced life expectancy, as you've alluded to, people with diabetes don't live as long. I'm not sure what the case is from an obesity perspective. I don't think the reduced life expectancy applies to people with obesity generally; it's the diseases they get from it that put them at higher risk of that.