Question 1

What is the best weight loss programme in the UK in 2026?

Accepted Answer

The best UK weight loss programme in 2026 depends on your budget and goals. GLP-1 injections (Mounjaro, Wegovy) produce the most weight loss — up to 22% body weight — but cost £133–£340/month. Slimming clubs (WW, Slimming World) are the most affordable at £11–£25/month. Surgery produces the most permanent results. Use our comparison tool to find the best option for you.

Question 2

What is the cheapest weight loss option in the UK?

Accepted Answer

The cheapest effective weight loss options in the UK are Slimming World and WW (Weight Watchers), from £11–£25 per month. Free options include the NHS Weight Loss Plan app and GP referrals to commercial programmes. GLP-1 injections start from £86.39/month (Wegovy 0.25mg, Medino).

Question 3

How much does Mounjaro cost in the UK per month?

Accepted Answer

Mounjaro costs between £133.19 and £370 per month in the UK in 2026, depending on the dose and provider. The 2.5mg starting dose averages £169 per month. Use our weekly-updated comparison table to find the cheapest provider for your dose.

Question 4

How much does a gastric sleeve cost in the UK?

Accepted Answer

A private gastric sleeve costs £9,000–£14,000 in the UK in 2026. NHS gastric sleeve is available free for patients meeting eligibility criteria (typically BMI 40+, or 35+ with obesity-related health conditions). Private waiting times are a few weeks; NHS waiting times are typically 18–36 months.

Question 5

Is Mounjaro better than Slimming World for weight loss?

Accepted Answer

Mounjaro produces significantly more weight loss than Slimming World — approximately 22% body weight loss vs 5–8% for Slimming World over 12 months. However, Mounjaro costs £133–£285/month vs £15–£20/month for Slimming World. Many experts recommend using GLP-1 medications for rapid initial loss then transitioning to a slimming club for long-term maintenance.

Question 6

What is the fastest way to lose weight in the UK?

Accepted Answer

The fastest non-surgical weight loss in the UK in 2026 is Mounjaro (tirzepatide) at maximum dose, producing approximately 22.5% body weight loss over 72 weeks. Very low calorie diets (Cambridge Weight Plan, LighterLife) produce faster initial loss in the first 1–3 months. Bariatric surgery (gastric bypass) produces the most total weight loss long-term.

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