Glossary
Staling
The gradual loss of freshness affecting all beer, driven by slow reactions whose rate roughly doubles for every 10 °C of extra warmth.
Related
- Maillard reaction — A major contributor to it.
- Oxidation — The related, more specific mechanism.
More vocabulary
Acetaldehyde · Autolysis · Bottle bomb · Diacetyl · DMS · Gushing · Lightstrike · Oxidation
See every term on the glossary index.
Last reviewed 2026-08-16.
Evidence
What BeerHQ knows about this, and how. Every statement carries the state of the evidence behind it rather than being presented flatly as fact.
Some of the aldehydes that make beer taste stale are not present at packaging but form in the bottle, as dicarbonyls and amino acids react together through Strecker degradation — which is why beer can stale without ever meeting fresh air.
Checked against the source
Source: Nobis et al., "A Comprehensive Evaluation of Flavor Instability of Beer (Part 2)" (2021), Introduction; Results and Discussion (Foods 10(11):2668)