NTDT200 Lecture Notes - Lecture 15: Laxative, Insulin Resistance, Multidisciplinary Approach
12 May 2016
School
Department
Course
Professor
Document Summary
Imbalance causes weight changes: not simply fat changes. 1 pound of fat = 3500 kcalories: not exactly correct, differs with gender and weight. Over time, loss is 75% fat, 25% lean. Direct measure of food"s energy value: bomb calorimeter: measures the heat energy released when foods are burned, provides potential estimate of energy of food. Indirect measure of energy released: oxygen consumed. Hunger: painful sensation that caused by lack of food, people typically eat every 4 hours. Physiological response to nerve signals and chemical messengers: hypothalamus. Influences (what to eat, when and how much) Satiety signal to not to start eating again. External cues: time of day, availability, sight, taste of food. Integrates messages: energy intake, expenditure, and storage, gastrointestinal hormones. Influence appetite control and energy balance: thermogenesis : heat generation, heat generation, measure of energy expended, total energy components: total energy the body expends, basal metabolism.
