The liver will start to adapt by performing gluconeogenesis from fat, which has plenty of calories (almost 2x as much per gram as carbohydrates). A human can ea

The liver will start to adapt by performing gluconeogenesis from fat, which has plenty of calories (almost 2x as much per gram as carbohydrates). A human can easily thrive on just fats and protein. See Inuit people who have lived on mostly blubber and meat for centuries.