Medically reviewed by Dr. Scott Maymon, ND, MPH · ~8 min read · Updated August 2026
Key takeaways
- GLP-1 and GIP are incretin hormones your gut releases after eating; together they trigger insulin, steady blood sugar, and influence appetite and fat storage.
- GLP-1 medications mimic your natural GLP-1. Semaglutide targets GLP-1 alone; tirzepatide is a dual agonist targeting both GLP-1 and GIP.
- Other hormones matter too — insulin, thyroid, cortisol, estrogen, progesterone, and testosterone all have an effect on weight, and imbalances can stall it.
- GLP-1 therapy is not the same as HRT. For some people, the two are combined under medical supervision.
- You can support GLP-1 and GIP naturally with protein, fiber, healthy fats, and a well-fed gut microbiome.
Weight is not just a calorie equation — it is a hormone conversation. Hormones govern how hungry you feel, how efficiently you burn energy, how your body handles blood sugar, and where it stores fat. GLP-1 medications have become a leading option for medical weight loss precisely because they work inside that hormonal system rather than around it. Understanding the hormones involved — starting with GLP-1 and its lesser-known partner, GIP — helps explain why these treatments work, and why they work better for some people than others.
What are GLP-1 and GIP hormones?
GLP-1 and GIP are incretin hormones released by your gut after you eat, and their main job is to tell the pancreas to release insulin at the right moment. GLP-1 stands for glucagon-like peptide-1; GIP stands for glucose-dependent insulinotropic polypeptide. Because they respond to food, they fine-tune blood sugar meal by meal — an effect known as the “incretin effect.”
GLP-1 does more than prompt insulin. It also slows how quickly your stomach empties, curbs appetite, and reduces the liver’s glucagon output, which is why it has such a strong effect on hunger and satiety. GIP shares the insulin-boosting role, but behaves differently elsewhere in the body, and its influence on weight is more nuanced — an area where the science is still developing.
What is clear is that the two hormones work as a team, and modern weight-loss medications are increasingly designed to engage both.
GLP-1 vs. GIP at a glance
| GLP-1 | GIP | |
|---|---|---|
| Full name | Glucagon-like peptide-1 | Glucose-dependent insulinotropic polypeptide |
| Released by | L-cells, lower small intestine & colon | K-cells, upper small intestine |
| Core role | Boosts insulin, slows stomach emptying, reduces appetite | Boosts insulin; broader, still-debated role in fat metabolism |
| Effect on hunger | Strong appetite suppression | Modest / indirect |
| Targeted by | Semaglutide, liraglutide, dulaglutide | Tirzepatide (paired with GLP-1) |
How do GLP-1 medications work with your hormones?
GLP-1 medications work by mimicking your body’s natural GLP-1 hormone, amplifying the same signals that normally quiet hunger and steady blood sugar after a meal. By binding to GLP-1 receptors, they help many people eat less without the constant fight against cravings.
These medications may help:
- Reduce appetite and food cravings
- Slow stomach emptying, so you feel full longer
- Improve blood sugar control and insulin sensitivity
- Increase satiety after meals
Not all of these medications are identical. Semaglutide targets the GLP-1 receptor only, making it a “single agonist.” Tirzepatide is a “dual agonist” that engages both GLP-1 and GIP receptors.
If you are weighing options, our guide to oral vs. injectable semaglutide breaks down the differences, and whether weight-loss injections are right for you covers candidacy. Every one of these is a prescription medication that requires a medical evaluation.
Why hormone imbalances make weight loss harder
When hormones are out of balance, the body resists weight loss even when your diet and exercise are on point. Shifts in hormone levels — or in how your cells respond to them — can distort hunger cues, slow metabolism, disrupt blood sugar, and change how fat is stored. This is one of the most overlooked reasons a plateau will not budge.
GLP-1 and GIP are only two players in a much larger system. Here are the hormones that most directly shape body weight.
Insulin
Insulin moves glucose from your blood into cells for energy. When insulin resistance develops, the body compensates with higher insulin levels, which can promote fat storage and make weight loss harder. Improving insulin sensitivity is one of the clearest ways GLP-1 therapy supports weight management.
Thyroid hormones
Thyroid hormones set your metabolic rate. Underactive thyroid function can bring fatigue, a slower burn, and unexplained weight gain — which is why thyroid testing is a critical part of any thorough weight-loss workup.
Cortisol
Cortisol, your primary stress hormone, can drive appetite, cravings for processed foods, and abdominal fat storage when it stays chronically elevated. If stress and weight feel linked for you, they may well be.
Estrogen and progesterone
These reproductive hormones influence body composition, appetite, energy, and insulin sensitivity. Their fluctuations during perimenopause and menopause are a common trigger for stubborn weight gain — more on that below.
Testosterone
Men and women both rely on healthy testosterone for muscle maintenance, metabolism, and body composition. Low levels can mean more body fat and less lean muscle. Our men’s hormone optimization program addresses this directly.
Gut satiety hormones (PYY, oxyntomodulin, ghrelin)
Beyond GLP-1 and GIP, your gut releases other appetite messengers — peptide YY (PYY) and oxyntomodulin promote fullness, while ghrelin drives hunger. A healthy, well-fed gut helps keep these signals balanced, which is part of why gut health and weight are so tightly connected.
GLP-1 and female hormones: the menopause connection
Declining estrogen and progesterone during perimenopause and menopause can make weight harder to lose and shift fat toward the abdomen. As estrogen falls, insulin sensitivity often drops and fat storage tends to move from the hips to the midsection — a change many women notice even when nothing about their diet has changed.
Because GLP-1 works on the incretin pathway rather than the sex-hormone pathway, it can help counter some of that metabolic slowdown from a different angle.
For many women, the most effective plan addresses both: supporting healthy sex-hormone levels while also improving appetite and blood sugar regulation. If this sounds familiar, our women’s hormone optimization therapy and the menopause diet guide are good next reads.
GLP-1 and hormone replacement therapy (HRT): can you combine them?
GLP-1 medications and hormone replacement therapy are different treatments for different problems, and for appropriate candidates, they can be used together under medical supervision. GLP-1 therapy mimics an incretin hormone to regulate appetite and blood sugar. HRT replaces sex hormones — such as estrogen, progesterone, or testosterone — that decline with age or menopause.
They are not interchangeable, and neither one “fixes” the other. But because menopausal hormone changes and metabolic dysfunction often reinforce each other, addressing both can be more effective than tackling either alone. Whether that combination is right for you depends on your labs, symptoms, and health history — which is exactly what a hormone evaluation is for. To go deeper on HRT itself, see our complete guide to bioidentical HRT and updated 2026 guidance on HRT safety.
How to increase GLP-1 and GIP hormones naturally
You can encourage your body to release more GLP-1 and GIP after meals by eating protein, healthy fats, and soluble fiber, and by supporting a healthy gut microbiome. These strategies will not match the potency of medication, but they build the foundation that any weight-loss plan depends on — and they help even more when combined with medical care.
Everyday ways to support natural GLP-1 and GIP release
| Strategy | Why it may help |
|---|---|
| Prioritize protein | Protein-rich meals are among the strongest natural stimulants of GLP-1 and promote lasting fullness. |
| Eat soluble fiber | Gut bacteria ferment soluble fiber into short-chain fatty acids that trigger GLP-1 release. |
| Include healthy fats | Monounsaturated fats — olive oil, avocado, nuts — can stimulate incretin secretion. |
| Feed your microbiome | Fermented foods and certain probiotic strains support the gut environment that produces satiety hormones. |
| Explore plant compounds | Early research points to compounds in monk fruit, yerba mate, and green tea as possible incretin supporters. |
| Minimize ultra-processed food | Whole foods produce steadier incretin and blood-sugar responses than refined options. |
Because so much of this runs through the gut, GI health and metabolic health are closely linked. Think of these habits as the base layer — the thing that makes every other treatment work better, not a replacement for one.
Can GLP-1 medications improve hormone-related weight gain?
GLP-1 medications are not designed to replace hormone therapy, but for appropriate candidates they may improve several metabolic processes tied to weight. They are not a cure-all, and they do not correct every imbalance, but they can meaningfully shift the metabolic terrain.
For the right patients, GLP-1 therapy may help:
- Improve insulin sensitivity
- Reduce excessive appetite signaling
- Support healthier blood sugar regulation
- Promote gradual, sustainable weight reduction
Because excess weight and hormonal dysfunction so often feed each other, progress in one area frequently supports the other. That is why a coordinated plan, rather than a single medication, tends to produce the most durable results.
A comprehensive approach to weight loss and hormone health
At Pure Body Health in Tempe, Dr. Scott Maymon, ND, MPH and Dr. Sarah Stone, ND treat weight and hormones as one connected system. Our evaluations look at symptoms, metabolic markers, hormone function, nutrition, and lifestyle together — not in isolation.
For appropriate candidates, a plan may combine GLP-1 medications, hormone optimization, nutrition guidance, and targeted lifestyle changes. The goal is not just a number on the scale; it is metabolic function you can maintain. If you have hit a wall, our take on overcoming a weight-loss plateau is a useful place to start.
Book a hormone & weight-loss evaluation in Tempe, AZ
Find out how your hormones may be influencing your weight — and what a personalized plan could look like. Call (480) 427-0442 or visit us at 1553 W Todd Dr #106, Tempe, AZ 85283. We serve South Tempe, Ahwatukee, Chandler, and the greater Phoenix area. Request an appointment.
Frequently asked questions
What are GLP-1 and GIP hormones?
GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide) are incretin hormones your gut releases after eating. Together they prompt the pancreas to release insulin, help regulate blood sugar, and influence appetite and fat storage.
What is the difference between GLP-1 and GIP?
Both boost insulin after meals, but they are released from different cells and act differently elsewhere. GLP-1 also slows stomach emptying and strongly reduces appetite, while GIP’s role in weight is more complex. Newer medications like tirzepatide target both at once.
Tirzepatide has GLP-1 and what other hormone?
GIP. Tirzepatide is a dual agonist that mimics both GLP-1 and GIP, whereas semaglutide targets only GLP-1. Both are prescription-only and require a medical evaluation.
Can you take GLP-1 medications and HRT together?
For appropriate candidates, yes, under medical supervision. They address different problems: GLP-1 medications regulate appetite and blood sugar through the incretin pathway, while HRT replaces sex hormones. A provider should confirm whether both are right for you.
Is hormone optimization the same as taking GLP-1 medications?
No. Hormone optimization evaluates and addresses imbalances in hormones like thyroid, cortisol, estrogen, and testosterone. GLP-1 medications mimic an incretin hormone involved in appetite and blood sugar regulation.
How can I increase GLP-1 and GIP naturally?
Eating protein, healthy fats, and soluble fiber, and supporting your gut microbiome with fermented foods, may help your body release more of these hormones after meals. Early research also points to compounds in monk fruit and yerba mate. These support — but do not replace — medical treatment.
Can hormones affect where the body stores fat?
Yes. Changes in cortisol, insulin, estrogen, and testosterone can shift fat distribution and body composition — for example, contributing to more abdominal fat.
Medical disclaimer
This article is for educational purposes and is not a substitute for personalized medical advice. GLP-1 and dual-agonist medications are prescription treatments that require evaluation by a qualified provider. Individual results vary. Consult your healthcare provider before starting, stopping, or combining any medication or hormone therapy.