set point

n. 1. A natural state of equilibrium to which biological systems tend to return if not prevented from doing so, as in the body's normal temperature of 98.6 degrees Fahrenheit. Some theorists have suggested that body weight has a set point and dieting causes only short-term weight loss in more than 95% of obese persons because the body adapts to the temporary shortage of food by slowing metabolism and then increasing consumption once the diet ends. 2. The desired outcome in an information processing system such as the desired temperature on a thermostat.