In fact, despite the recent popularity of low-carb diets, humans across cultures and around the globe, including hunter-gatherers like the Hadza, typically get more calories from carbohydrates than from fats or proteins (Chapter 6). We’re primates, after all, and primates eat plants—especially ripe, sweet fruits. Carbohydrates are our main source of fuel, and we have a 65-million-year history of relying on them.