There’s no one single approach.

1. Stop overincentivizing HFCS; as a sugar replacement, its main feature is suppressing natural hormones that tell you “I’m full, let’s stop eating”. It’s a corn product, which often makes it a very “American” thing to support.
2. Design walkable communities. Many people can’t schedule out time to get exercise, but should get it regularly through their job or community.
3. Make programs designed to promote home cooking, ensuring people have time in their day to do it, adequate kitchen space, and buy-in from their family or lifemates. Many people live off take-out or ready meals, which means they don’t know what goes into it, and also don’t socialize with family.