PS263 Lecture Notes - Lecture 9: Hyperinsulinemia, Somatostatin, Lipogenesis
Document Summary
The benefits of eating are not realized until the food that we consume is digested. Digestion of food delivers energy to the body in three forms. 3)glucose (simple sugar broken down from complex carbohydrates) Since consumption is intermittent and energy use is constant the energy from food consumption is stored in the form of fats (85%), glycogen (0. 5%), and proteins (14. 5%) Fat is the most efficient form of energy storage because it can store almost twice as much energy as glycogen (at equivalent weight values) There are three phases of energy metabolism by the body. 1)cephalic (preparatory) and absorptive phases level of insulin are high to promote immediate energy use and storage. Glucagon levels are low to inhibit conversion of stored energy to useable energy during these two phases. The reverse is true during the fasting phase. During this phase glucagon levels are high and energy stores are trapped while insulin levels are low, inhibiting energy storage.
