A quick reference
Body weight and body composition, side by side
| Measure | Body weight | Body composition |
|---|---|---|
| What it records | A single total figure from a set of scales | The proportion of fat, muscle, water and bone within that total |
| What it can miss | Changes in muscle or fat that offset one another | Day-to-day fluctuation from hydration or food volume |
| Common way to track it | Bathroom scales | Skinfold callipers, tape measurements or bioelectrical devices |
| Typical use in this editorial context | A simple, low-cost starting point | A more detailed picture over weeks or months |






