Using GLP-1s

Gastric emptying

The rate at which the stomach passes its contents into the small intestine, which GLP-1 medications slow down.

By the glp1.how editorial teamReviewed Jul 18, 2026

Gastric emptying is the rate at which the stomach passes food and liquid on into the small intestine. GLP-1 medications slow this process, so the stomach stays fuller for longer.

That slowdown is part of why these medications increase feelings of fullness and reduce appetite. It is also linked to common digestive side effects such as nausea and constipation, which is one reason doses are usually started low and increased gradually. The FDA label for Wegovy states that semaglutide delays gastric emptying (DailyMed (external link)).

The slowing is often smaller and less lasting than the phrase suggests. In a 12-week trial of semaglutide in adults with obesity, the first hour after a meal was slower, but overall emptying was not significantly different from placebo (Hjerpsted et al., Diabetes, Obesity and Metabolism, 2018 (external link)). With long-acting drugs the body adapts over weeks, though some residual slowing remains (Jalleh et al., J Clin Endocrinol Metab, 2024 (external link)). For how much, how long, and how emptying is measured, see the full guide to gastric emptying on a GLP-1.

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Revision history

Updated 2 times since Jul 18, 2026 · show changes

v3Sep 30, 2026, 6:46 PM CDT
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v2Sep 26, 2026, 12:56 AM CDT
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v1Jul 18, 2026, 4:46 PM CDT
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Related terms

GLP-1 · A gut hormone (glucagon-like peptide-1) that stimulates insulin release, slows digestion, and reduces appetite; the target of drugs like semaglutide and liraglutide.
Semaglutide · A GLP-1 receptor agonist medication made by Novo Nordisk, sold under the brand names Ozempic (type 2 diabetes) and Wegovy (weight management), each as an injection or a pill.
Wegovy · Novo Nordisk's brand name for semaglutide (weekly injection or, since December 2025, a daily pill), FDA-approved for chronic weight management and heart-risk reduction, and as an injection for MASH liver disease.

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