What is a GLP-1?

GLP-1 is a hormone your body naturally releases from the gut after you eat. It helps tell your brain, “We’ve eaten, so you can turn down the hunger.” It also helps regulate blood sugar and plays a role in how quickly food moves through your stomach.

GLP-1 medications essentially turn up a signal your body already makes after you eat. They communicate with areas of the brain involved in hunger, fullness, and food reward, so you tend to feel satisfied sooner, stay satisfied longer, and have less drive to keep eating. For some people, this also means fewer cravings and less of that constant “food noise” running in the background.

They can also slow how quickly food leaves the stomach and, in people with diabetes, help regulate blood sugar by increasing insulin when glucose is elevated and reducing glucagon. So these medications aren't simply “appetite suppressants” because they work with several of the body's normal signals that help regulate hunger, fullness, eating, and metabolism.

Downsides of GLP-1 Medications

The most common downsides are stomach-related: nausea, constipation, diarrhea, vomiting, reflux, burping, stomach pain, or feeling uncomfortably full. These symptoms are often worse when first starting the medication or after a dose increase. If vomiting or diarrhea becomes significant, dehydration can also put stress on the kidneys.

Less common but more serious concerns include gallstones or gallbladder inflammation, severe allergic reactions, and possible pancreatitis. Low blood sugar is mainly a concern when a GLP-1 medication is combined with diabetic medication like insulin or metformin. Severe or persistent abdominal pain, repeated vomiting, yellowing of the skin or eyes, or being unable to keep fluids down should be evaluated promptly as those can be signs of the less common, more serious complications.