Curt Ellis and Ian Cheney, creators of a documentary called "King Corn" about the prevalence of corn in the American diet, challenged each other to go one month on the road without consuming the staple ingredient. "I ate sauteed spinach for breakfast, a lot of salads for lunch and grass-fed lamb or halibut for dinner," Ellis said. "I baked my own bread. It was hard going without milk or eggs, or cream [from corn-fed cows] in my coffee."

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