For awhile I got fascinated by this, so I followed it closely. Our food policy in the US was driven by the economic hardships of the 30s when farmers were going out of business and there were food shortages. We decided to subsidize basic crops like corn and wheat that could be produced at scale and be stored for long periods of time. Those policies worked.
Now we live in a time of plenty and the drive to produce cheap corn had the effect of also producing cheap meat.
The policies worked so well that now we have a crisis of abundance. We want our citizens to eat fruit and vegetables to contain soaring medical costs, but there are no subsidies on them. It's hard to take back the subsidies on wheat and corn, so we're living with cheap donuts and hamburgers. That causes us to provide big health care subsidies to contain the staggering costs of preventable diseases like type II diabetes and atherosclerosis.