Stop subsidizing corn production. Invest in making fruits and vegetables cheaper. Encourage development that includes high walkable and bikable aspects while minimizing driving aspects.
If everybody made "healthy choices" tomorrow, they would starve because there aren't even enough healthy foods on the shelves. I don't get how a country can criminalise drugs but subsidise HFCS. HFCS has to kill around the same amount of people as fentanyl does.