One of the foremost researchers in human metabolism reveals surprising new science behind food and exercise. We burn 2000 calories a day. And if we exercise and cut carbs well lose more weight. Right Wrong. In this paradigmshifting book Herman Pontzer reveals for the first time how human metabolism really works so that we can finally manage our weight and improve our health. Pontzers groundbreaking studies with huntergatherer tribes show how exercise doesnt increase our metabolism. Instead we burn calories within a very narrow range nearly 3000 calories per day no matter our activity level. This was a brilliant evolutionary strategy to survive in times of famine. Now it seems to doom us to obesity. The good news is we can lose weight but we need to cut calories. Refuting such weightloss hype as paleo keto antigluten antigrain and even vegan Pontzer discusses how all diets succeed or fail For shedding pounds a calorie is a calorie. At the same time we must exercise to keep our body systems and signals functioning optimally even if it wont make us thinner. Huntergatherers like the Hadza move about five hours a day and remain remarkably healthy into old age. But elite athletes can push the body too far burning calories faster than their bodies can take them in. It may be that the most spectacular athletic feats are the result not just of great training but of an astonishingly efficient digestive system. Revealing irreverent and always entertaining Pontzer has written a book that will change how you eat move and live. show more