Take a look at the figures below, which shows (left pyramid) the categories that federal agricultural subsidies fall into, compared to
(right pyramid) federal recommendations for how often we should eat those types of food.
As Gwen Sharp notes at Sociological Images:
Just to clarify, the 73.8% figure for meat and dairy on the left doesn’t
refer just to direct subsidies; it also includes subsidies for crops
that are grown primarily to feed livestock. The “grains” category
(13.23%) refers to grains grown for human consumption. If you included
all grains in one category it would be much larger, but somewhat
misleading in that the vast majority of grains grown in the U.S. aren’t
intended for people to eat.
Without subsidized grain, keeping livestock in confined feeding
facilities to fatten them up would be much more expensive, if not
entirely cost-prohibitive. Thus, farm subsidies are an essential
component of U.S. agribusiness.
The U.S. government does not look out for the interests and welfare of citizens. It looks out for the interests and welfare of powerful, organized interests.