Aresident of a famine area who appears undernourished and extremely emaciated has eaten only starches for the past 3 months. a urine analysis shows that a large amount of nitrogen is being excreted. this is most likely evidence of: a. an abnormally high rate of glycogen breakdown in the liver. b. breakdown of the body's own structural proteins to provide energy. c. utilization of the last remaining fat reserves to provide energy. d.incomplete reabsorption of nitrogenous products due to kidney failure.