What Is GLP-1, and How Does It Help With Weight Loss?

A plain explanation of GLP-1, how medications like semaglutide and tirzepatide work, and what to expect under physician supervision.

Reviewed by Dr. Rishi Seth, MDBoard-Certified Internal Medicine

Published June 1, 2026 · 2 min read

A GLP-1 medication vial with a syringe drawing a dose against a soft blue background

The short answer

GLP-1 (glucagon-like peptide-1) is a hormone your gut releases after eating that helps regulate appetite and blood sugar. GLP-1 medications such as semaglutide and tirzepatide mimic that hormone, so you feel full sooner and eat less, which supports steady weight loss when used under physician supervision.

How GLP-1 works in the body

After a meal, your intestines release GLP-1, which signals the brain that you are full, slows how fast the stomach empties, and helps the pancreas manage blood sugar. The medications copy that signal and extend it, which is why appetite drops and cravings ease.

That is also why these medications were first used for type 2 diabetes before their weight effects became widely studied.

Why supervision matters

GLP-1 medications work best as part of a managed plan. Dosing is titrated up slowly to limit side effects like nausea, labs track your metabolic markers, and a physician adjusts based on how you respond. Started carelessly, they cause avoidable side effects and plateaus.

In our Tampa program, that supervision is built in: monthly telehealth, quarterly labs, and medication shipped to your home, with Dr. Rishi Seth overseeing the whole course.

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GLP-1 Weight Loss at Seth Premier Medical

Physician-supervised, in Tampa, with Dr. Rishi Seth.

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What Is GLP-1, and How Does It Help With Weight Loss?, answered.

Used under physician supervision with proper dosing and monitoring, GLP-1 medications have a well-studied safety profile. Side effects are usually mild and managed by titrating the dose slowly.

Most people notice reduced appetite within the first weeks, with steady weight loss over months as the dose is adjusted.

GLP-1 is the hormone (and the class of medications that mimic it). Ozempic is one brand of a specific GLP-1 medication, semaglutide. So Ozempic is a GLP-1, but not every GLP-1 is Ozempic.

Zepbound is tirzepatide, which acts on the GLP-1 pathway and a second one called GIP. It is often grouped with GLP-1 medications because of that shared action.

GLP-1 medications reduce appetite on their own, but results are better and more durable paired with adequate protein, resistance training, and good habits, which also help protect muscle.

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