Cooper was actually so much more than just a food enthusiast, she had a degree in agricultural science. For her degree she studied the way plants are grown, science and animal health and their effects on human consumption. So its fairly safe to say that she has a deep understanding about nutrition.
She believes animals which are fed low-quality nutrients on farms can pass those low-quality nutrients on to us when we eat them. She's not a vegetarian, but she never eats anything without knowing exactly where it came from.