How it fits together · lesson 3 of 10
Acute vs chronic: allostatic load
The slow, cumulative wear-and-tear of a system that never gets to reset.
5 min read · reviewed October 2026
The bill comes due slowly
Your body can handle big demands if it gets to recover. Allostatic load is the cumulative cost of being switched on too often for too long — the wear that builds when the stress response runs without enough recovery.
Allostatic load, explained
Think of it like a credit card: short-term stress is fine if you pay it back with recovery. Chronic stress runs up a balance — and the interest shows up as health problems years later.
How it works →
Allostasis is stability through change — the body adjusting its set-points to meet demand. Allostatic load is the physiological 'wear and tear' when those systems (HPA axis, sympathetic nervous system, immune, metabolic) are over-activated or fail to shut off, dysregulating cortisol rhythm, blood pressure, glucose, and inflammation.
What the studies show →
McEwen and colleagues developed the allostatic-load framework; composite allostatic-load indices predict cardiovascular disease, cognitive decline, and mortality in long-running cohort studies.
Allostatic load is best described as:
- A single acute stress event
- The cumulative wear from chronic over-activation without recovery
- A type of exercise
- A vitamin deficiency
Show the answer →
B.The cumulative wear from chronic over-activation without recovery
Allostatic load is the long-term 'wear and tear' that accumulates when the stress systems are chronically activated and don't get enough recovery — and it predicts later disease.