Scale back, over time, the subsidies on growing crops that contribute to health issues in the USA such as hybrid wheat, corn and soy. Increase or add subsidies to increase the supply/decrease the cost of beef, specifically grass-fed, grass finished beef.
Increase subsidies to also allow farmers to produce healthy, natural grown chicken, turkey, etc for both meat and eggs.
Increase subsidies for milk production that also focuses on grass fed cows as well.
Other areas can be pursued but the main focus should be the encouragement of production of healthier foods, as determined by scientific data.