The typical human adult uses about 160 g of glucose per day, 120 g of which is used by the brain. The available reserve of glucose (~20 g of circulating glucose and ~190 g of glycogen) is adequate for about one day. After the reserve has been depleted during starvation, what other sources can be used to produce glucose? fatty acids from triglycerides cholesterol from cholesterol esters pyruvate by carboxylation to form oxaloacetate adenine from ATP glucogenic amino acids from muscle protein glycerol from triglycerides ketogenic amino acids from muscle protein