"Pollan's discussion of the industrial food chain is in large part a critique of modern agribusiness. According to the book, agribusiness has lost touch with the natural cycles of farming, wherein livestock and crops intertwine in mutually beneficial circles. Pollan's critique of modern agribusiness focuses on what he describes as the overuse of corn for purposes ranging from fattening cattle to massive production of corn oil, high-fructose corn syrup, and other corn derivatives.
He describes what he sees as the inefficiencies and other drawbacks of factory farming and gives his assessment of organic food production and what it's like to hunt and gather food. He blames those who set the rules (e.g., politicians in Washington, D.C., bureaucrats at the United States Department of Agriculture, Wall Street capitalists, and agricultural conglomerates like Archer Daniels Midland) of what he calls a destructive and precarious agricultural system that has wrought havoc upon the diet, nutrition, and well-being of Americans. Pollan finds hope in Joel Salatin's Polyface Farm in Virginia, which he sees as a model of sustainability in commercial farming. Pollan appears in the documentary film King Corn (2007)."
See more @ Wikipedia
More Info..