Gastric Emptying

Deep dive

Gastric Emptying: complete reference

Gastric emptying is the rate at which food and liquid leave the stomach and enter the small intestine — a key determinant of post-meal blood glucose rise, satiety duration, and digestive comfort. Normal gastric emptying half-time is 90-120 minutes for solids. GLP-1 receptor agonists slow gastric emptying by 30-70% depending on dose and individual response, creating multiple downstream effects: prolonged stomach fullness (enhances satiety), blunted post-meal glucose spikes (improves glycemic control), and reduced caloric absorption rate (contributes to weight loss). The slowed emptying is also responsible for most GI side effects (nausea, reflux, vomiting risk) — especially during titration weeks when delivery rates change. Patients with pre-existing gastroparesis are typically contraindicated for GLP-1 therapy because the additive delay can cause severe symptoms. Imaging studies (gastric emptying scintigraphy) confirm the effect; clinically, patients report "feeling food stay in stomach" especially with high-fat or high-fiber meals.

In practice

On Ozempic, your post-meal sense of fullness may last 3-4 hours longer than before — food literally stays in your stomach longer, slowing how quickly carbs become blood sugar.

Clinical context

Delayed gastric emptying is both therapeutic benefit and source of GI side effects. Patients with gastroparesis are usually excluded.