You have cut the calories. You have logged the workouts. And still the scale will not move, because hunger always wins. This is exactly where GLP-1 peptides have captured researchers’ attention worldwide. Here is what the studies actually show.

The real problem is appetite, not willpower

Glucagon-like peptide-1 (GLP-1) is a hormone the gut releases after eating. It signals fullness to the brain and slows how fast the stomach empties. In people who struggle with weight, that satiety signalling is often blunted, so hunger returns quickly and portions creep up. Research on GLP-1 receptor agonists focuses on restoring that signal.

What the trials found

In the STEP 1 trial published in the New England Journal of Medicine (Wilding et al., 2021), participants using a GLP-1 receptor agonist alongside lifestyle changes lost a mean of roughly 15% of body weight over 68 weeks, compared with about 2.4% on placebo. Later semaglutide and tirzepatide trials (the SURMOUNT programme) reported even larger mean reductions. The consistent theme across studies is reduced appetite and energy intake, not a metabolic trick.

Why this matters for stubborn fat

Most diets fail for a predictable reason: the body defends its fat stores by increasing hunger as you lose weight. By supporting the satiety pathway, GLP-1 research targets that exact mechanism, which is why it has become one of the most studied areas in metabolic science.

The honest caveats

Study results are averages, gastrointestinal effects are the most commonly reported in trials, and outcomes depend on continued lifestyle support. This is why the field is framed around research and controlled settings rather than shortcuts.

Explore related research overviews such as Semaglutide vs Tirzepatide vs Retatrutide and the appetite science behind why diets fail.

Research disclaimer▾

Alle informatie op deze pagina is bedoeld voor laboratoriumonderzoek en in-vitro studies. Geen humane consumptie. Geen medische claims. Producten zijn niet goedgekeurd door EMA of FDA voor therapeutisch gebruik.