A glucose reservoir
Muscle stores glycogen. More muscle means more room to park carbohydrate rather than leaving it circulating in your blood or converting it to liver fat.
The ageing curve
Adults lose 3–8% of muscle mass per decade after 30 — a process called sarcopenia — unless they train against resistance. This loss drives falls, frailty and declining metabolic health more than age itself.
The minimum effective dose
Two or three sessions per week of progressive resistance training, hitting each major muscle group, is enough to build and maintain. Bodyweight, bands or free weights all work.