3,087 reviewsof the Weight Doctors® Group · 97% recommendation rateBlog · 8 May 2026 · 7 min read

GLP-⁠1 explained honestly: effects, limits and what can come next

Why GLP-⁠1 pharmacotherapy helps many people but is not the whole answer for everyone – and which paths there are when the injection alone is not enough.

GermanyNetherlandsMedically reviewed byDr. med. Robert JennerSpecialist in visceral surgery / specialised visceral surgeryLast updated:

Between turning point and dead end

Rarely has a treatment been as controversial as the GLP-⁠1-based weight-loss injection. For some it is a turning point, for others a medical dead end. As so often, the truth lies somewhere in between.

At Weight Doctors®, we talk every day with patients who have started GLP-⁠1 pharmacotherapy – some euphoric, some frustrated, some simply at a loss. This article aims to bring clarity: what GLP-⁠1 can do, where it reaches its limits, and how you can find the next step without the detour of trial and error.

The effects

What GLP-⁠1 is – and why it excites so many people

GLP-⁠1 (glucagon-like peptide-1) is a hormone produced by the gut that is released after eating and regulates the feeling of fullness. Modern medications contain active substances that imitate this hormone or strengthen its effect – in everyday language, this is called “GLP-⁠1 pharmacotherapy”.

The effects of GLP-⁠1 therapy: the stomach empties more slowly, the feeling of hunger is dampened, and cravings ease. Clinical studies show an average weight loss of 15 to 22.5% of body weight – more than many conventional methods achieve.

For many people worldwide, GLP-⁠1 therapy is therefore a real turning point. Besides weight, related conditions such as type 2 diabetes, high blood pressure or lipid metabolism disorders can also improve. Anyone who starts GLP-⁠1 pharmacotherapy is doing something for their health – that is also part of the truth.

15 to 22% sounds like a lot – what does it really mean?

At first glance, the study results look impressive. Behind the percentages, however, is a reality that often gets lost in the public debate – and that is crucial for you.

In practice, a weight loss of 15 to 22.5% means a reduction of around 10 to 15 kilograms for most patients – rarely more. With moderate excess weight, that may be exactly the goal. With pronounced obesity and a BMI well above 35 or 40, it is a good start, but rarely the end of the journey.

In other words: GLP-⁠1 pharmacotherapy is a powerful tool, but not a miracle cure. It brings many people to a point where they realise: there is still some way to go.

Results vary from person to person.

The limits

The other side – where GLP-⁠1 reaches its limits

However convincing the evidence on effectiveness is, everyday life often looks different. Dr. med. Roland Mörmel, specialist in internal medicine at Weight Doctors®, puts the international data into context:

“Up to 65% of patients stop the therapy within two years. Side effects such as nausea, vomiting and diarrhoea are common. After stopping, between two thirds and over 80% of the lost weight comes back.”

Dr. med. Roland Mörmel, specialist in internal medicine

Why many people do not reach their goal with GLP-⁠1 alone

  • A plateau on the scalesAfter good initial success, weight stops falling despite continued therapy.
  • Side effectsNausea, vomiting and diarrhoea noticeably affect everyday life.
  • CostsThe monthly costs add up; statutory health insurers in Germany do not pay for the therapy for weight reduction.
  • The question of duration“Do I want this for the rest of my life?” – many people ask themselves this at some point.

That does not mean GLP-⁠1 is bad. It means that with the right concept behind it, GLP-⁠1 pharmacotherapy can develop its full effect – without that concept, it remains an interim solution for many.

Bridge therapy

GLP-⁠1 is not the end,
but often a building block

GLP-⁠1, gastric balloon and endo sleeve are not mutually exclusive. On the contrary: used wisely, they complement each other.

We call this bridge therapy – a well-thought-out step-by-step concept in which each treatment works where it is strongest. This is exactly what distinguishes a medical strategy from a mere product recommendation. The transition is supported by doctors and adapted to your progress.

  1. Gastric balloon → GLP-⁠1You lose weight with the gastric balloon over 6 or 12 months and then use GLP-⁠1 pharmacotherapy to stabilise the weight you have reached.
  2. Endo sleeve → GLP-⁠1After permanent stomach reduction with pose® 3.0 Double Helix or OverStitch NXT™, GLP-⁠1 therapy can help as a supplement during the stabilisation phase.
  3. GLP-⁠1 → Endo sleeveIf the weight-loss injection reaches its limits, a one-off, long-term treatment takes over – entirely without conventional surgery.

At Weight Doctors®, we do not plan individual treatments, but your whole journey.

Weight Doctors SLEEVE®

The endo sleeve – if you are looking for a lasting solution

If you do not reach your goal with GLP-⁠1 pharmacotherapy – or want a one-off, lasting solution from the start –, you will find an alternative to conventional stomach reduction in Weight Doctors SLEEVE®.

With the endoscopic procedures pose® 3.0 Double Helix or OverStitch NXT™, the stomach volume is reduced by up to 70–75%. The procedure is minimally invasive, performed through the mouth – without external incisions, without scars, as an outpatient – and is designed to be long-term.

What does that mean in everyday life? You feel full sooner and naturally eat less – without a weekly injection. A one-off treatment instead of a monthly therapy. And where there is a medical indication in line with the guidelines, there is a chance of cost coverage by your German health insurer.

Four myths about GLP-⁠1 – and what is true

  • “If I stop, the weight stays off”Wrong. In two thirds of people, a large part of the lost kilos comes back after stopping. This is not a sign of a lack of discipline, but a biological reaction of the body.
  • “GLP-⁠1 replaces a procedure”No. GLP-⁠1 pharmacotherapy can prepare for, accompany or complement a procedure. For some people, however, permanent stomach reduction is the more honest and more sustainable path.
  • “Online pharmacies are as good as medical support”This is not just a myth, but a risk. GLP-⁠1 therapy belongs in the hands of a specialist – with individual dosing, regular check-ups and care that continues even after stopping.
  • “GLP-⁠1 is a fad”That is not true either. GLP-⁠1 is well researched scientifically. The question is not whether it works, but for whom and for how long.
Independent advice on therapy

Six paths – one consultation

At Weight Doctors®, our advice is independent of any one therapy: if another treatment suits your situation better, we will recommend exactly that. With us, the conversation comes before the treatment – not the other way round.

  • Weight Doctors® GLP-⁠1Losing weight entirely without a procedure, with private medical support. Learn more
  • Weight Doctors® GASTRIC BALLOONA companion for a limited time, for 6 or 12 months – also swallowable. Learn more
  • Weight Doctors SLEEVE®Permanent stomach reduction without surgery using pose® 3.0 Double Helix or OverStitch NXT™. Learn more
  • Weight Doctors BARIATRICS®Weight-loss surgery including private medical preliminary examination and aftercare; with a chance of cost coverage by German health insurance where there is a medical indication in line with the guidelines. Learn more
  • Weight Doctors® RESHAPEBody contouring after weight loss, by specialists in plastic surgery. Learn more
  • Weight Doctors® REVISIONCorrective procedure if an earlier weight-loss operation has not brought the desired success or complaints have occurred. Learn more

And if you are still unsure? That is exactly what the no-obligation consultation is for. You can find the current prices under Costs & Prices.

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Frequently asked questions

Questions and answers

Your question isn’t listed? Your specialist will take time for it during the consultation.

Who is GLP-⁠1 suitable for?

GLP-⁠1 therapy can be a sensible option if you have obesity, prefer a medication-based path without a procedure and would like to be supported by doctors. Realistic expectations are important: GLP-⁠1 pharmacotherapy helps with losing weight, but does not replace a change in lifestyle. Whether it suits you – or whether another path makes more sense – we clarify in the no-obligation consultation.

How much weight can I really lose with GLP-⁠1?

In clinical studies, the average weight loss was 15–22.5% of body weight; in everyday life, that is around 10–15 kg for most people. With moderate excess weight, that may be enough; with pronounced obesity, it is often a good start, but rarely the end of the journey. Results vary from person to person.

Does German health insurance cover the cost of GLP-⁠1?

In Germany, statutory health insurers currently do not pay for GLP-⁠1 medications for weight reduction alone; the therapy is a self-pay service. It is different with weight-loss surgery or the endo sleeve: here, there is a chance of cost coverage where there is a medical indication in line with the guidelines. There is no advance application: billing takes place directly after the procedure.

What happens if I stop the weight-loss injection?

In two thirds of people, a large part of the lost weight returns after stopping – a biological reaction of the body, not a personal failure. For that reason, do not stop the therapy without consulting your doctor, and talk early about follow-on options such as bridge therapy or an endo sleeve.

What is bridge therapy and how does it work?

A step-by-step concept in which GLP-⁠1, gastric balloon and endo sleeve complement each other instead of competing. For example, you lose weight with the gastric balloon and then maintain the weight with GLP-⁠1 therapy – or switch to Weight Doctors SLEEVE® if the injection reaches its limits. Our doctors support the transition.

What distinguishes the endo sleeve from conventional stomach reduction?

With the endo sleeve (Weight Doctors SLEEVE®), the stomach is reduced endoscopically through the mouth – without external incisions and scars. With conventional stomach reduction (gastric sleeve or gastric bypass), surgery is performed laparoscopically, with small incisions in the abdominal wall. Both procedures have their place; which one suits you depends on BMI, related conditions and your goals.

Is the consultation really no obligation?

Yes, completely. We advise you on all paths – GLP-⁠1, gastric balloon, endo sleeve, weight-loss surgery and RESHAPE – and recommend what suits your situation. Only when you decide on a path do we move forward.

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  1. No procedureWeight Doctors® GLP-⁠1 pharmacotherapyMedication-based, no procedure
  2. No procedureWeight Doctors® 360°Nutrition coaching
  3. Long-lastingNewWeight Doctors® hydroGMAEndoscopic, no incisions
  4. No surgeryWeight Doctors® GASTRIC BALLOONTemporary, also swallowable
  5. No surgeryHealth insurance cover also possible*Weight Doctors SLEEVE®Endoscopic, permanent
  6. With surgeryHealth insurance cover also possible*Weight Doctors BARIATRICS®Surgical, minimally invasive
  7. With surgeryHealth insurance cover also possible*Weight Doctors® REVISIONCorrective procedure after weight-loss surgery
  8. LipoedemaHealth insurance cover also possible*Weight Doctors® lipoedema surgeryLiposuction for lipoedema
  9. After weight lossHealth insurance cover also possible*Weight Doctors® RESHAPEAfter weight loss

* For patients with German statutory health insurance: if the medical indication is established in line with the DGAV guidelines, reimbursement may be possible.

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