October 15, 2026 · 2 min read
How GLP-1 Medications Work for Weight Loss
A plain-English guide to how GLP-1 and dual GLP-1/GIP medications help regulate appetite, and who may be a good candidate.
Medically reviewed by Dr. Ibrahim Elsheikh, MD, MBA
GLP-1 medications have changed how doctors approach weight management. Here's what they do, how they differ, and what to expect if you start treatment.
What is GLP-1?
GLP-1 (glucagon-like peptide-1) is a hormone your gut releases after you eat. It signals to your brain that you're full, slows how quickly your stomach empties, and helps your body manage blood sugar.
GLP-1 medications mimic this hormone. Because the effect lasts longer than your body's natural GLP-1, many people find:
- They feel satisfied with smaller portions
- Food cravings and "food noise" quiet down
- Blood sugar levels become more stable
GLP-1 vs. dual GLP-1/GIP medications
Semaglutide is a GLP-1 medication. Tirzepatide is a dual-action medication that acts on both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide), another hormone involved in appetite and metabolism.
Both are taken as a once-weekly injection. Your clinician will recommend one based on your health history, goals, and how you respond to treatment.
Who may be a candidate?
GLP-1 treatment is generally considered for adults who have:
- A BMI of 30 or higher, or
- A BMI of 27 or higher with a weight-related condition, such as high blood pressure, high cholesterol, sleep apnea, or prediabetes
These medications aren't right for everyone. People with a personal or family history of medullary thyroid carcinoma or MEN2, a history of pancreatitis, or who are pregnant or planning pregnancy usually aren't candidates. A licensed clinician will review your full history before prescribing.
What to expect in the first months
Treatment starts at a low dose that increases gradually. This "titration" gives your body time to adjust and helps minimize side effects like nausea or constipation.
Most patients notice reduced appetite within the first few weeks. Weight loss tends to be gradual and steady, and results are best when medication is combined with balanced nutrition, protein-forward meals, and regular movement.
The bottom line
GLP-1 medications are a powerful tool, but they work best with medical guidance. If you're curious whether treatment could help you, take our 2-minute eligibility quiz.
This article is for general information only and is not a substitute for medical advice. Talk with a licensed clinician about your individual situation.
