You may not think you eat a lot of corn and soybeans, but you do: 75 percent of the vegetable oils in your diet come from soy (representing 20 percent of your daily calories) and more than half of the sweeteners you consume come from corn (representing around 10 perecent of daily calories).
In Defense of Food: An Eater's Manifesto (ed. Penguin, 2008) - ISBN: 9781101147382