The old adage "you are what you eat" is even more true today, with the widening gulf between naturally grown foods and industrial processed foods. To understand "what you eat", you need to consider both the safety and the nutritional of your food sources. It is interesting that all wild animals know what is safe and nutritious for their unique species, and that like them, man once knew this too, when he was eating grass-fed natural beef as a hunter-gatherer. However, as man has become more "civilized", he has increasingly abandoned food that is safe and nutritious for food that is plentiful and inexpensive. With our professed intelligence, we then turn to the experts among us to tell us why we are becoming unhealthy and they in turn seek the newest technology that holds the promise of making our food sources even more plentiful and inexpensive, while addressing the mistakes we made with earlier technology "solutions." Americans at the turn of the 21st century are the most obese population to ever have inhabited the planet, experiencing alarmingly rapid increases in the incidence of coronary disease, hypertension, depression, diabetes, certain cancers, and autoimmune diseases such as arthritis. Alarmed at what we have become ("what we are"), many are refocusing their attention on "what we eat", and are returning to a diet containing grass-fed, natural beef.
Michael Pollan describes the very eloquently in his bestselling novel titled The Omnivore’s Dilemma.
A great source of ongoing reading pleasure regarding food, farming, and health is the Weston A. Price Foundation’s web site (www.westonaprice.org) and their quarterly journal containing thought-provoking articles, published under the banner Wise Traditions in food, Farming and the Healing Arts.