Authors of a study published in the Proceedings of the National Academy of Sciences tested for carbon and nitrogen isotopes in 480 servings of beef, chicken, and french fries. From these tests, the authors could tell that the animals were kept in confinement, ate a mostly-corn diet, and maybe even ate their own poo. Very interesting. Check it out.
“Because the food chain has become so long now, and it’s a global industry, we want to know the origin of our food as consumers,” says Monahan. “Consumers nowadays want to know the story of their food.”