Weston A Price Foundation. His book "nutrition and physical degeneration" is from the 40's or 50's I believe. He was a dentist that travelled the world studying different cultures on traditional diets vs modern diets. He documented the health effects of all the tribes he studied, eating healthy doses of animal fats, it's fascinating. Sally Fallon wrote "nourishing traditions" with Mary Enig. It's based on Dr Price's findings, she also is the president of WAPF they have a yearly convention in the states that thousands of people flock to!