PHYSICS 102 Lecture Notes - Lecture 14: Blood Sugar, Glucagon, Thermostat
Document Summary
Set-point assumption: regulatory mechanism which sees hunger as an energy deficit. Energy set point: optimal levels of energy resources in body (wanted temperature) Set point mechanism: defines the set point (thermostat) Detector mechanism: detects deviations from the set point (thermometer) -> all set point systems are negative feedback system to maintain homeostasis (stable internal environment) Problems: obesity and overweight can"t occur if eating is regulated only by set point. Inconsistency with eating-related evolutionary pressures (no constant availability --> eat large quantities to fill energy reservoir: fail to consider other major influences on eating behaviour like the taste, learned eating behaviour or social influences --, settling point. Positive-incentive perspective/theory: humans and animals are drawn to eat by the expected pleasure of eating not because of an energy deficit. No internal deficit but human evolved to crave for eating. Positive incentive values: presence/anticipation of good food, flavour, learned effects when eating this type of food, type, quantity.
