As medications like Mounjaro (tirzepatide) gain popularity in the UK, misinformation has grown alongside genuine public interest. Here are ten of the most common myths, addressed with evidence-based facts.
Myth 1: Weight Loss Medications Are Just a Quick Fix
Reality: Obesity is a chronic, relapsing condition driven by complex biological mechanisms. Medications like Mounjaro address underlying hormonal and metabolic drivers of excess weight. They work best as part of a long-term treatment strategy alongside lifestyle changes, not as a short-term shortcut.
Myth 2: You Will Regain All the Weight When You Stop
Reality: While some weight regain is common after discontinuation (as shown in SURMOUNT-4), the extent varies significantly between individuals. Many patients retain a meaningful proportion of their weight loss, particularly when they maintain healthy lifestyle habits developed during treatment.
Myth 3: These Medications Are Only for People Who Lack Willpower
Reality: This myth reflects a fundamental misunderstanding of obesity biology. Body weight is regulated by powerful hormonal systems that defend against weight loss. Medications like tirzepatide work on the same pathways, helping to recalibrate appetite signalling. Willpower alone cannot override these biological mechanisms indefinitely.
Myth 4: Weight Loss Medications Are Dangerous
Reality: All medications carry potential risks, but Mounjaro has undergone rigorous clinical trials involving thousands of participants and is approved by the MHRA. The side effect profile is well-characterised, and for most eligible patients, the health benefits of significant weight loss substantially outweigh the risks.
Myth 5: You Do Not Need to Exercise or Eat Well While on Medication
Reality: Medication and lifestyle changes are complementary, not interchangeable. Exercise helps preserve muscle mass, improves cardiovascular fitness, and supports mental health. A balanced diet ensures adequate nutrition. Medication makes these lifestyle changes easier by reducing appetite and cravings.
Myth 6: Weight Loss Medications Work the Same for Everyone
Reality: Individual responses vary considerably. In the SURMOUNT trials, weight loss ranged from modest to exceptional. Factors including genetics, metabolic health, adherence, diet, and activity levels all influence outcomes.
Myth 7: You Can Buy Legitimate Mounjaro Without a Prescription
Reality: Mounjaro is a prescription-only medication in the UK. Any source selling it without requiring a valid prescription is operating illegally, and the product may be counterfeit or unsafe. Always use GPhC-registered pharmacies.
Myth 8: GLP-1 Medications Cause Eating Disorders
Reality: There is no evidence that GLP-1 medications cause eating disorders. However, patients with a history of disordered eating should discuss this with their prescriber, as any treatment affecting appetite requires careful monitoring in this population.
Myth 9: Natural Supplements Work Just as Well
Reality: No over-the-counter supplement has demonstrated weight loss results comparable to tirzepatide in rigorous clinical trials. Many weight loss supplements sold in the UK are unregulated and lack meaningful evidence of efficacy.
Myth 10: These Medications Are Just for Vanity
Reality: Obesity significantly increases the risk of type 2 diabetes, cardiovascular disease, certain cancers, sleep apnoea, and numerous other conditions. Treating obesity is a medical intervention that can add years to life and dramatically improve quality of life. Dismissing it as vanity ignores the serious health consequences of untreated obesity.
If you have questions about weight loss medications, speak to your GP or pharmacist for personalised, evidence-based advice.