Chances are you’ve heard the term ”GLP-1” by now—whether on the news, from your doctor, or in conversation with a friend who just started a new medication.

GLP-1 medications are reshaping how we think about metabolic health, obesity, and cardiovascular disease. But what’s actually happening inside your body when you take one? And how strong is the evidence behind the hype?

What Does GLP-1 Stand for?

GLP-1 stands for glucagon-like peptide-1. It’s a hormone your gut naturally produces primarily in the small intestine in response to eating. Think of it as one of your body’s built-in signals for ”food is here—manage it accordingly.” 

When the GLP-1 hormone is released, it tells your pancreas to produce more insulin, tells the liver to ease up on glucagon (a hormone that raises blood sugar), and signals your brain that you’re starting to feel full. In short, the GLP-1 hormone is a key regulator of blood sugar, appetite, and metabolic balance.

RELATED: Introducing GLP-1 Insights

How Do GLP-1s Work?

GLP-1 receptor agonists do exactly what their name implies: they bind to and activate the GLP-1 receptor, which is found throughout the body, including the pancreas, the brain, the gut, the heart, and the kidneys.

The downstream effects are multifaceted. In the pancreas, they stimulate insulin secretion in a glucose-dependent manner, meaning they help release insulin when blood sugar is high, but not when it’s already low. They also inhibit glucagon release and slow gastric emptying, which blunts the spike in blood sugar after a meal.

GLP-1 receptors are present on brain cells (neurons) in regions that govern appetite and reward. When activated, they reduce hunger signals, promote satiety, and appear to decrease the appeal of calorie-dense foods. This central action is a major reason why people taking these medications often eat less through altered neurological signaling.

Beyond blood sugar and appetite, GLP-1 receptor agonists also appear to reduce triglycerides and LDL cholesterol, decrease fat stored in organs (ectopic fat), and lower markers of systemic inflammation—all of which contribute to cardiovascular and metabolic health over time.

RELATED: What Is Metabolic Health? A Comprehensive Guide

What Conditions Are GLP-1s Approved for?

The FDA-approved indications for GLP-1 medications have expanded considerably over the past two decades. These use cases include: 

  • Type 2 Diabetes: All approved GLP-1 receptor agonists can be used to improve blood sugar control in adults with type 2 diabetes, typically along with diet and exercise. The first GLP-1 receptor agonist, exenatide (e.g. Byetta®), was approved specifically for type 2 diabetes in 2005, with several additional agents following.
  • Chronic Weight Management: Liraglutide (e.g. Saxenda®, Victoza®) was approved for obesity in 2014. Semaglutide (e.g. Wegovy®, Ozempic®) and Tirzepatide (e.g. Zepbound®) were subsequently brought to market over the next decade. These obesity use approvals are for  adults with a BMI ≥30, or ≥27 with at least one weight-related condition such as hypertension, type 2 diabetes, or elevated cholesterol.
  • Cardiovascular Risk Reduction: The FDA approved semaglutide (e.g Wegovy®) in March 2024 to reduce the risk of major adverse cardiovascular events (cardiovascular death, non-fatal heart attack, and non-fatal stroke) in adults with established heart disease and overweight or obesity. This made GLP-1 therapy one of the few obesity treatments with a proven cardiovascular benefit.
  • Metabolic Dysfunction-Associated Steatohepatitis (MASH): Semaglutide (Wegovy®) received accelerated FDA approval in August 2025 for adults with MASH, also known as nonalcoholic steatohepatitis, a serious liver disease, and moderate-to-advanced liver fibrosis, reflecting growing evidence of the GLP-1 hormone’’s role in liver health.
  • Obstructive Sleep Apnea: Tirzepatide (Zepbound®) was approved by the FDA in 2024 for the treatment of moderate to severe obstructive sleep apnea (OSA) in adults with obesity, to be used in combination with increased physical activity and a reduced-calorie diet.

Research is also ongoing into potential applications in kidney disease, sleep apnea, and even substance abuse disorders.

READ MORE: The Essential Guide to Eating for Metabolic Health

Person wearing Oura Ring 5 in Silver holding a piece of fruit What Are Common Side Effects of GLP-1s?

GLP-1 medications are generally well-tolerated, but they do come with a side effect profile, which is worth understanding before starting treatment.

The most common side effects are gastrointestinal, including nausea, vomiting, diarrhea, and constipation. Nausea in particular can affect anywhere from 5% to 50% of users depending on the agent and dose, and tends to be most pronounced in the early weeks of treatment as the dose is being titrated upward. For most people, these symptoms improve over time and can be managed with slower dose escalation and dietary adjustments.

Other possible side effects include muscle loss, reduced bone density, headaches, inflammation at injection site, and increased risk of mental health conditions like depression and anxiety. If you are taking a GLP-1 medication and are concerned about any of the side effects, you should reach out to your doctor to discuss.

How Can Oura Support Me With GLP-1 Therapy?

Your medication is one part of the story. Oura connects the rest. With Oura’s new GLP-1 Insights feature, you can log your medications, symptoms, and weight with a view of key biometric trends—all in one place. GLP-1 Insights gives you a single, longitudinal view of your medication journey alongside your Oura signals, so you can see how your treatment and daily habits are working together over time.

The Bottom Line

GLP-1 drugs represent a genuine shift in how medicine approaches metabolic disease. The evidence base is robust, the indications are expanding, and ongoing research continues to reveal new applications.

Choosing to start a GLP-1 medication is a significant decision to be made in close consultation with your healthcare provider. As always, Oura can be your dedicated health companion, helping you stay in tune with your body’s signals. By monitoring sleep, activity, and weight trends in one place, you can gain a clear, holistic view of how your body is responding to treatment.

Talk to your healthcare provider before starting or stopping any medication. This article is for informational purposes only and does not constitute medical advice.