If you've researched medical weight loss at all, you've seen the alphabet soup: GLP-1, GIP, semaglutide, tirzepatide. They get lumped together in headlines, but they're not interchangeable, and the differences matter when you're deciding what to put in your body.
The short version
GLP-1 is a hormone your gut releases after you eat. It tells your brain you're full, slows how fast your stomach empties, and helps regulate blood sugar. GLP-1 medications (semaglutide is the best-known) mimic that hormone.
Tirzepatide mimics two hormones at once: GLP-1 plus a second gut hormone called GIP. That dual action is why you'll hear it called a "GLP-1 and GIP receptor agonist," and it's the medication our weight loss program is built around.
Why the second hormone matters
GIP plays its own role in how your body handles insulin and stores fat.
What they have in common
- Both are weekly injections you give yourself at home
- Both work primarily by regulating appetite and blood sugar, not by "burning fat" directly
- Both commonly cause digestive side effects, especially early and around dose increases
- Both work best, and keep working, when paired with changes in how you eat and move
What actually determines your results
Here's what we tell patients: the medication choice matters less than the program around it. The same drug produces very different outcomes depending on whether anyone checked your baseline labs, whether your dose gets adjusted based on how you respond, whether side effects get managed or just endured, and whether anyone is preparing you for maintenance after the medication.
The medication opens a window. What you build while the window is open decides what happens when it closes.
That's why our program includes lab work before you start, nutritional counseling alongside the prescription, and a maintenance plan from day one. If you've been going it alone with an online subscription, or trying to choose between medications from headlines, a consult with a nurse practitioner who can look at your actual health picture is a better way to decide.