QUOTE : In the nineteenth century, when Europeans were exploring North America, a few explorers and fur trappers made contact with the nomadic Indians of the northern plains, a people who, like many hunter-gatherers, lived almost exclusively off animals. The Europeans of necessity adopted that diet and soon found themselves quite ill, even to the point of sprouting open, running sores on their faces. They were like we are today and ate only muscle meat. But then the Indians showed them the choice parts, the bits of liver and spleen, bone marrow and brain and the fat, especially the fat. The Europeans ate as they were told and got better because the organ tissue contained some essential micronutrients lacking in the muscle meat.