What are the motifs in The Omnivore's Dilemma: A Natural History of Four Meals by Michael Pollan?

A recurring idea that Pollan uses throughout the novel is that of the intense connection between the foods we eat and our relationships with nearly all other organisms on the planet. What we eat, how we eat it, and where we eat it all contribute to the transformation of eating into culture. Our planet has drastically changed as a result of agriculture, and our eating defines our relationship with plants, animals, fungi, and all other parts of nature. Many of the plants, such as corn, Pollan argues, have developed solely as a result of the human need for the product and thereby rely on us for their survival just as we rely on them.