GLP-1: 7 myths and what’s actually true

The three things to remember

• Obesity is a chronic disease — GLP-1 acts on the biology, not on «willpower».
• Much of what you hear is outdated or oversimplified; the evidence is more nuanced.
• A treatment remains a medical decision — with benefits and limits worth knowing.

Few health topics are as charged as the “weight-loss injection”. Between hype and scepticism, the facts often get lost. This article takes apart the seven most common myths, without sugar-coating and without scaremongering.

Myth 1: “It’s the easy way out”

Fact: That sentence is loaded with stigma. Obesity is a recognised chronic disease in which hunger and fullness signals are regulated differently — not a problem of poor discipline. GLP-1 acts directly on this biology and, for many people, is what makes lasting change possible in the first place.

That still doesn’t make it “easy”: nutrition, movement, sleep and medical guidance remain part of the journey. The medication doesn’t replace them — it supports them.

Myth 2: “It’s only for diabetics”

Fact: GLP-1 originally came from diabetes care, but it has since also been studied and used for weight management. In the large STEP 1 trial, people with overweight or obesity without diabetes lost on average around 15% of their body weight over 68 weeks [1]. So you don’t need to have diabetes for it to be relevant — whether it’s an option for you is a question of eligibility.

Myth 3: “As soon as you stop, it all comes back”

Fact: Part of the weight often does return after stopping. In the extension of the STEP 1 trial it was on average around two-thirds of the weight that had been lost. But "right back to square one" is the exception: on average, participants stayed below their starting weight [2]. The point behind this: obesity is chronic. How you reduce or end a treatment is a medical question, planned rather than abrupt (more in our article on stopping).

Myth 4: “You mainly lose muscle”

Fact: With any weight loss — whether through diet, surgery or GLP-1 — part of the lost weight comes from fat-free mass, which includes muscle. But how much is largely in your own hands: with enough protein and strength training, you can counteract muscle loss. And that’s worthwhile, because low muscle mass is associated with a higher health risk [3]. Rather than watching only the scale, it’s worth looking at your body composition.

Myth 5: “The injection is dangerous”

Fact: Like any effective medication, GLP-1 has side effects — most commonly gastrointestinal complaints, which are usually mild and temporary. Serious side effects are rare. At the same time, large trials show health benefits beyond weight loss: in the SELECT trial, GLP-1 reduced the risk of major cardiovascular events by around 20% in people with overweight and pre-existing cardiovascular disease (without diabetes) [4]. So “dangerous” is too sweeping — what matters is medical guidance and knowing the side effects.

Myth 6: "GLP-1 makes you depressed or suicidal"

Fact: Early on there was a suspicion. However, large analyses and the regulators (the US FDA and the European EMA, 2024), as well as a systematic review, found no established link between GLP-1 and an increased risk of suicidal ideation [5] (though the evidence is still heterogeneous). That doesn’t mean changes in mood should be ignored — if you notice anything like that, discuss it medically. If you’re in acute distress, in Switzerland you can reach Die Dargebotene Hand on Tel. 143 (24/7). But a blanket fear of GLP-1 is not supported by the current state of knowledge.

Myth 7: "It’s only cosmetic"

Fact: Weight loss in obesity isn’t cosmetics — it’s metabolic medicine. Alongside the cardiovascular benefit mentioned above [4], many people see improvements in blood pressure, blood sugar and blood lipids; trials have also shown benefits for the kidneys and liver. So it’s less about a number on the scale than about health — more in our overview article on GLP-1.

In brief

Most GLP-1 myths are either outdated, oversimplified or coloured by stigma. GLP-1 isn’t "the easy way out" — it’s a medical treatment for a chronic disease, with proven benefits beyond weight loss, real but mostly manageable side effects, and clear limits. It’s not a miracle cure and it’s not cheating; it’s a tool that, used with medical guidance, can make sense. As always: whether it suits you is decided by a medical assessment — not by a myth.

Want to know what’s true for you — beyond the myths? Take the no-obligation eligibility check. If you’re eligible, care’s FMH medical team reviews your details — medically checked, no pressure. → Check your eligibility

Frequently asked questions

Is the weight-loss injection an easy way out? No. Obesity is a chronic disease; GLP-1 acts on the biology, not on willpower. Nutrition, movement and medical guidance remain part of the journey.

Do I have to have diabetes for GLP-1 to be an option? No. GLP-1 is also studied and used for weight management in overweight and obesity without diabetes. Whether it suits you is a medical question.

Do you regain all the weight after stopping? Often part of it returns, but rarely all of it. In studies, average weight stayed below the starting value. How you stop belongs in a doctor’s hands.

Is GLP-1 dangerous? It has side effects, usually mild gastrointestinal complaints; serious ones are rare. Large trials even show benefits for the heart, kidneys and liver. What’s decisive is medical guidance.

Medical disclaimer

This article is for general information and health education. It does not replace individual medical advice, diagnosis or treatment. Whether a particular treatment is right for you is decided in a medical assessment. Any prescription-only treatments mentioned are available only on a doctor’s prescription. If you have health concerns, please consult a doctor.