GLP-1 vs GLP-2 vs GLP-3: What's the Difference? (2026)
What is the difference between GLP-1, GLP-2, and GLP-3?
GLP-1, GLP-2, and emerging GLP-3 receptor targets each play different roles in appetite and metabolism. MealFan's 2026 explainer covers what each receptor does, which drugs target them, and where retatrutide fits. This is general information, not medical advice.
- Explains GLP-1, GLP-2, and GLP-3 receptor differences
- Maps current drugs to the receptors they target
Updated June 2026 · Reviewed by the MealFan editorial team
Last updated: June 25, 2026 | Written by: Eric Sornoso, MealFan editor
Key takeaways
- GLP-1 (Ozempic, Wegovy, Mounjaro, Zepbound) is the weight-loss class.
- GLP-2 (teduglutide/Gattex) treats short bowel syndrome, not weight loss.
- 'GLP-3' isn't a real hormone; people mean triple agonists like retatrutide.
- If you're here for weight loss, you want GLP-1 and the triple agonists.
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General guidance, not medical advice. Confirm targets with your prescribing clinician.
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GLP-1: the weight-loss class
GLP-1 (glucagon-like peptide-1) is the hormone behind the entire modern weight-loss drug wave. GLP-1 receptor agonists reduce appetite and slow digestion, and improve blood sugar. This is the class that includes semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound). If your question is about losing weight, this is the family you mean.
GLP-2: a different hormone, a different job
GLP-2 (glucagon-like peptide-2) comes from the same parent molecule as GLP-1 but does something unrelated: it helps the intestinal lining grow and absorb nutrients. Its drug, teduglutide (brand names Gattex in the US, Revestive elsewhere), is approved for short bowel syndrome, a serious malabsorption condition. It is not a weight-loss drug, does not suppress appetite, and is prescribed for a small, specific patient group.
So what is “GLP-3”?
There is no hormone officially called GLP-3. People use the term casually to describe the next generation of weight-loss drugs, the triple agonists that act on three receptors at once (GLP-1, GIP and glucagon). The leading example is retatrutide, which produced roughly 24 to 28% weight loss in trials but is still investigational and not yet FDA approved.
| Term | What it is | Used for | Examples |
|---|---|---|---|
| GLP-1 | Appetite + blood-sugar hormone | Weight loss, type 2 diabetes | Ozempic, Wegovy, Mounjaro, Zepbound |
| GLP-2 | Gut-lining / absorption hormone | Short bowel syndrome (not weight loss) | Teduglutide (Gattex) |
| “GLP-3” / triple agonist | GLP-1 + GIP + glucagon (3 pathways) | Weight loss (investigational) | Retatrutide |
Here for weight loss? Start with the GLP-1 essentials and the meal strategy that protects muscle as appetite drops.
Frequently asked questions
Is GLP-2 a weight-loss drug?
No. GLP-2 (the drug teduglutide, sold as Gattex/Revestive) treats short bowel syndrome by helping the intestinal lining absorb nutrients. It is not used for weight loss and works on a different pathway than GLP-1 drugs like Ozempic.
What's the difference between GLP-1 and GLP-2?
GLP-1 and GLP-2 come from the same parent hormone but do different jobs. GLP-1 reduces appetite and improves blood sugar (the basis of Ozempic, Wegovy, Mounjaro, Zepbound). GLP-2 promotes intestinal growth and absorption, used for short bowel syndrome, not weight loss.
Is there a GLP-3 drug?
Not as a named hormone. People sometimes say “GLP-3” loosely to mean the newer triple-agonist drugs like retatrutide, which act on three receptors (GLP-1, GIP and glucagon). That is the next generation of weight-loss medicine, but it is still investigational.
Which GLP drug is for weight loss?
The GLP-1 class, Ozempic and Wegovy (semaglutide) and Mounjaro and Zepbound (tirzepatide). The investigational triple agonist retatrutide goes further still. GLP-2 is unrelated to weight loss.
The nutrition side most drug guides skip
We are a food site, so here is what the drug-only sites leave out: GLP-1 weight-loss drugs (Ozempic, Wegovy, Mounjaro, Zepbound) and triple agonists like retatrutide works by shrinking appetite, and that creates a real nutritional risk. When you eat far less, you do not just lose fat, you can lose muscle and fall short on protein, fiber, and key vitamins and minerals. The fix is not eating more; it is making every bite count.
The four risks to manage (and the food fix)
| Nutrition risk | Why it happens | The food fix |
|---|---|---|
| Muscle & protein loss | Rapid weight loss plus too little protein, up to a third of lost weight can be lean muscle. | 1.2 to 1.6 g protein per kg body weight daily; anchor every meal and snack with protein. |
| Low micronutrients | Eating far less total food shrinks intake of iron, B12, calcium, vitamin D, potassium and magnesium. | Nutrient-dense picks: eggs, salmon/sardines, Greek yogurt, leafy greens, beans, nuts and seeds, fortified foods. |
| Constipation | Slowed digestion plus less food and fiber. | Fiber-rich vegetables and fruit you can tolerate; steady fluids; move daily. |
| Dehydration & low energy | Reduced intake and GI fluid losses during dose changes. | Sip fluids and electrolytes through the day; never skip food entirely. |
What to actually eat on GLP-1 weight-loss drugs (Ozempic, Wegovy, Mounjaro, Zepbound) and triple agonists like retatrutide
- Protein at every meal and snack: eggs, chicken, fish, Greek yogurt, cottage cheese, tofu, beans, or a protein shake. When you can only finish a few bites, make them protein.
- Nutrient-dense, smaller-volume foods: salmon and sardines (omega-3, vitamin D, B12), eggs, dairy, leafy greens, beans and lentils, nuts and seeds, berries.
- Easy formats for nausea days: protein smoothies (protein powder + fruit + spinach), broth-based soups, yogurt.
- Hydration and fiber: water and electrolytes through the day, plus tolerable high-fiber vegetables and fruit to keep things moving.
If your appetite is so low that you are eating very little, a daily multivitamin can backstop the gaps, ask your prescribing clinician. The goal across the board: protect muscle and stay nourished while the medication does its job.
The simplest way to hit these numbers while your appetite is unpredictable is pre-portioned, macro-labeled meal delivery built for exactly this.
See our tested GLP-1 meal delivery picks →
Or browse Best High-Protein Meal Delivery
Sources & references
- Glucagon-like peptide-1 (GLP-1). Wikipedia.
- Glucagon-like peptide-2 (GLP-2). Wikipedia.
- Teduglutide (Gattex), short bowel syndrome. Wikipedia.
- Retatrutide, overview, mechanism, trial history. Wikipedia.
Related reading
- Retatrutide 2026: the triple-agonist guide
- GLP-1 statistics 2026
- Ozempic vs Mounjaro
- Best GLP-1 meal delivery
Not medical advice. Educational overview of how these hormones and drug classes differ. Consult a licensed clinician about any medication.
Why Protein Matters on Any GLP-1 (Meal Picks)
GLP-1 medications suppress appetite, which is effective for weight loss but puts lean muscle at risk if protein intake falls. CookUnity’s high-protein line runs 25-30g+ protein per serving (steak and salmon dishes often 40g+), plans from ~$14/meal. Verified picks:
| CookUnity meal | Protein | Calories | Carbs |
|---|---|---|---|
| Curried Grilled Chicken with Spiced Cauliflower | 45g | 450 | 46g |
| Grilled Flank Steak Grain Bowl | 43g | 770 | 38g |
| Chipotle Lime Salmon | 40g | 480 | 21g |
Whichever GLP pathway your medication targets, keep protein at 30g+ per meal to preserve muscle. Every CookUnity meal shows exact protein, carbs, fat and calories, and you can filter the menu by “High Protein.”
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