who makes glp-1 drugs Medications for Weight Loss GLP-1 receptor agonists | How

Real-world users on tirzepatide lost approximately 12.4% of body weight at one year in a 2025 study, which is meaningfully higher than semaglutide alone

Additionally, GLP-1 RAs modulate the hypothalamus (the region in the brain that controls appetite) to regulate hunger, slow gastric emptying, and regulate gut hormones such as leptin (a hormone that helps regulate body weight on a long-term basis)

Nonetheless, clinical evidence remains inconclusive

Growth hormone secretagogues like CJC-1295 and ipamorelin may counteract muscle loss during calorie restriction, though adding complexity increases cost and risk

After stopping phentermine, hunger returns to baseline within days and weight regain is common within months

And they act on the hypothalamus and brainstem to reduce the reward value of food, a subtle but profound shift that many patients describe as simply not thinking about food the way they used to