"A set point is like an internal gyroscope that stabilizes our response to events that push us off balance. Research investigating the effects of life changes on long-term well-being supports the idea of a return to set point."
"The set point is like a thermostat, except that it controls your weight rather than the temperature of the room"
A video of this analogy is in the link.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.