Define what you are following
"Waist" can mean a tape position, a body-model estimate or the visible outline in photographs. Record which method produced each result.
For visual tracking, use front and side views. A side profile can show shape that is hard to see from the front alone.
Repeat the conditions
Use similar clothing, posture, camera position and time of day. Avoid comparing one relaxed photograph with another taken while twisting, flexing or holding the stomach in.
If using a tape, follow the same position each time (NICE NG246, 2025). A photo-based waist figure is an estimate. Keep it labelled as one, and don't treat it as interchangeable with a tape reading.
Look for a supported direction
The NHS suggests keeping your waist to less than half your height (NHS, 2026). NICE uses the same waist-to-height ratio to judge health risk (NICE NG246, 2025).
Treat a change in your waist as a shape signal, not proof of fat loss, muscle change or a medical outcome.
Keep this check-in repeatable.
- Choose and label the method
- Use front and side evidence
- Match posture and clothing
- Repeat the same setup
- Describe direction cautiously
Where these facts come from.
- Overweight and obesity management. NICE guideline NG246: identifying and assessing overweight, obesity and central adiposity. Published 14 Jan 2025.
- Overweight and obesity. NHS conditions. Last reviewed 29 Apr 2026.
Checked 25 Oct 2026. Trial figures are average results in the trial, not predictions. Labels change; your prescriber and the leaflet in your pack have the current version.
Pip Body Scan is a personal progress record. It is not a medical device and does not give medical advice, diagnose conditions or recommend doses. Speak to your prescriber or another qualified healthcare professional about symptoms, side effects or changes to your treatment.