GLP-1 and GIP are two hormones your gut releases after you eat. Both help regulate appetite, blood sugar, and how your body handles food. Today’s weight-loss medications work by mimicking these hormones. Some target GLP-1 alone, and some target both GLP-1 and GIP, which is why they can affect appetite a little differently.
What is GLP-1?
GLP-1 (glucagon-like peptide-1) is a hormone released after eating. It tells your brain you’re full, slows how quickly your stomach empties, and helps your body release insulin when blood sugar rises. When people talk about “GLP-1 medications,” they mean drugs that mimic this hormone to reduce appetite and “food noise.” Semaglutide is a GLP-1 medication.
What is GIP?
GIP (glucose-dependent insulinotropic polypeptide) is another gut hormone released after eating. It also plays a role in how your body handles blood sugar and stores or burns energy, and it appears to influence appetite and metabolism. On its own it’s less famous than GLP-1, but combined with GLP-1 it seems to enhance the appetite and weight effects.
How they work together in medications
- GLP-1 medications (like semaglutide) act on the GLP-1 pathway alone.
- Dual GLP-1 / GIP medications (like tirzepatide) act on both pathways at once. Hitting two targets is why tirzepatide tends to produce somewhat higher average weight loss in studies.
- The newest experimental medications go further still, adding a third pathway, but those aren’t available yet.
For a practical breakdown, see semaglutide vs. tirzepatide: how to choose.
Why this matters for you
You don’t need to memorize the biology, but “more pathways” isn’t a magic upgrade you should automatically chase. A dual-action medication can mean more average weight loss, but the right medication for you depends on your body, your goals, and your budget. And whichever pathway your medication targets, protein, movement, and tracking your body composition are what determine whether you lose fat instead of muscle.
That’s the approach behind The Trim Method. We match the medication to you and build the program around it.
Related reading
- Semaglutide vs. Tirzepatide: How to Choose
- The Complete GLP-1 Weight Loss Guide
- How Much Weight Can You Expect to Lose?
Frequently asked questions
Is GIP better than GLP-1?
Neither is “better.” They’re different hormones that do related jobs. Medications that target both can produce more average weight loss, but the best fit depends on the individual.
Which medications target GIP?
Dual-agonist medications such as tirzepatide act on both the GLP-1 and GIP receptors. GLP-1-only medications such as semaglutide act on GLP-1.
Not sure which is right for you? Book a free consultation at our Bellevue clinic.
