What realistic weight loss looks like on GLP-1 therapy

Overview

Average trial weight loss with tirzepatide is around 15-20% of starting weight over 72 weeks, and around 10-15% with semaglutide, but individual results vary widely. In kidney disease we care as much about what happens to blood pressure, proteinuria and function as about kilograms.

Why it's done and who it helps

• A 5% loss at six months is the usual minimum threshold for continuing.
• Weight loss is not linear; plateaus of two to four weeks are normal.
• Waist circumference often improves before the scale moves much.
• Losing weight too fast risks muscle loss and, on dialysis, dry-weight errors.

A realistic timeline

Weeks 0-12 are about tolerability and habit-building; weeks 12-26 usually deliver the clearest change; after 26 weeks the focus shifts to protecting muscle and holding the loss.

Non-scale outcomes we track

Blood pressure, HbA1c, urine albumin-to-creatinine ratio, eGFR trajectory, sleep apnoea symptoms, mobility and grip strength.

When slow is the right speed

In advanced CKD, on dialysis, or after transplant we deliberately target a slower rate of loss to protect lean mass and nutritional status.

Preparing for your appointment

Is 1 kg a week too fast?

Usually yes for kidney patients; 0.5-0.75 kg a week is a safer target.

Why has my weight stalled?

Plateaus reflect adaptation; we review protein, training, dose and fluid before assuming failure.

When to contact your care team

Contact the clinic promptly if you have any of the following:

• Vomiting or diarrhoea lasting more than 24 hours, or you cannot keep fluids down
• Passing much less urine than usual, or new swelling of the legs or face
• Severe pain in the upper abdomen that spreads to your back, with or without vomiting
• A weight change of more than 2 kg in a week that is not explained by fluid
• A missed weekly weight, a missed dose, or any hospital admission

If you are seriously unwell, contact NHS 111 or your renal unit directly rather than waiting for your next review.

Your care at KidneyWeight Clinic

Every dose change, weekly weight and kidney blood test is recorded in your clinical monitoring record, reviewed by Professor Mohammed Mahdi Althaf at six-weekly intervals and formally reassessed at 26 weeks. Booking and your initial payment are handled by professoralthaf.co.uk, medication supply by Healist Pharmacy, and follow-up appointment payments by Carebit.

References

• NICE TA1026: tirzepatide for managing overweight and obesity
• NICE TA875: semaglutide for managing overweight and obesity
• NICE CG189: obesity identification, assessment and management
• NHS: weight-loss medicines

This article is general patient information reviewed by a consultant nephrologist. It is not individual medical advice; treatment decisions are made at a face-to-face consultation.