Amber O’Hearn, a science writer, a programmer, and, since 2009, a radical carnivore, discusses fat and protein with Dr. Ted Naiman, a medical doctor specialising in diet and exercise, who coined the term P:E diet, which stands for the protein to energy ratio diet. Why some people who can't lose weight with high protein can with lower protein and higher fat. How does fat type influence metabolism? The protein leverage hypothesis. P:E diet limitations. Ted and Amber's protein:fat ratios 2:1 fat:protein PKD potential advantages. The problem of our hedonic wiring in the modern world. Importance of respiratory fitness. Ted and Amber’s ideal studies to test their hypotheses.