Sarcopenia
The age-related loss of muscle strength, muscle quantity, and physical performance. The modern definition puts strength first because weak muscle predicts function better than size alone.
Plain English
Sarcopenia is the loss of usable muscle, not just a change in how the body looks.
Why It Matters After 40
After 40, muscle is a reserve account for stairs, balance, glucose control, injury recovery, and independence. The earlier a person trains it, the more room they have later.
What To Do With It
Prioritize progressive resistance training, enough daily protein, and repeatable function tests like grip strength, chair stands, walking speed, or training loads.
Human Utility
- Turn a research term into a training or nutrition decision.
- Track function, not just body weight.
- Look for a habit you can repeat weekly.
Proof Structure
Strength is central
The revised European consensus treats low muscle strength as the key sign of probable sarcopenia, with low muscle quantity used to confirm it.
Source: EWGSOP2 consensus