I think we can tackle different issues at the same time

For heart issues, it is a bit hard to fix. You need a healthy lifestyle is general is something you need the correct environment for and a good education about. Still, it's not impossible and any sane country has food labeling requirements and education around it as well as promotion of physical exercise. It's being done.

Similarly car-centric city design is not easy at first but it can be done and has been done:

Relax zoning and parking requirements, provide good fast collective transport alternatives,that is with dedicated lanes and safety staff. The general idea is that you shouldn't be forced to have a car if you don't want one. Even people who do want to keep their cars will be happier because there will be less people on the road overall: Imagine that traffic jam you're stuck into if half the people vanish because they are using a bike or a subway, woosh, no more traffic jam.