Having studied the latest research on the economics and politics of obesity, I've grown skeptical that a convincing case can be made that government-wide interventions can reduce obesity's cost contribution to the health care system in the near-term. The more one studies obesity itself and its effect on human beings, however, the stronger one feels a moral imperative to act. But how? If "we" knew, "we" would have figured it out by now.
Here, per the Campaign to End Obesity, a multilateral consortium of business, health and academic groups, are the relevant line items in the House and Senate bills, listed in order (according to me) of impact.