No. 338 · Fixing problems · Biology
Homeostasis
Stability is not stillness: healthy systems stay steady by correcting themselves all the time.
In the Almanac
“Walter Cannon”, 1926 · “Novo Nordisk”, 2017–2023
Both stories in full, three ways to use it and where it misleads.
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What is Homeostasis?
Homeostasis is the ability of an organism or system to keep its internal conditions stable as the outside world changes. Your body senses drift in temperature or blood sugar and corrects it. Stability is active, not still.
How do you use Homeostasis?
Use it when change keeps sliding backwards. Expect resistance, build early check-ins, automate financial corrections and change health habits gradually so your body can settle. But remember that a system can also stabilise around a bad set point. Sometimes you must move the set point itself.
When does Homeostasis matter?
Homeostasis is one of the 40 mental models for fixing problems, the situations where you ask: Why does this keep going wrong, and how do I fix it for good? Within that, it belongs to “How systems push back”, alongside Bottlenecks, Ecosystems and Feedback Loops.
What is an example of Homeostasis?
Two stories show it at work: Walter Cannon (1926) and Novo Nordisk (2017–2023). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.
Which mental models are related to Homeostasis?
Le Chatelier’s Principle, Feedback Loops and Hysteresis. Homeostasis itself comes from biology.