What does SDA mean?
All pre industrial tribes passed their genes thanks to animal products. Price went on an expedition upon the invention of modern air travel to find and study primitive peoples, their diets, and the effect of modernized foods (i.e. 100% non animal foods). Price hypothesis was that in some corner of the Earth there is a superior vegan diet. https://m.media-amazon.com/images/I/91I7wBR067L._SL1500_.jpg
Seventh Day Adventist