How is gastric emptying rate affected by what you eat?

• A. Decreased emptying rate: fats, solids, acids; increased rate: liquids, distention
• B. Decreased emptying rate: liquids; increased rate: solids
• C. No effect of meal composition
• D. Decreased emptying rate: carbohydrates

Answer: (A)

Gastric emptying is not fixed; it depends on what the meal contains and its physical form. Fats slow gastric emptying most strongly because they trigger hormonal signals like cholecystokinin that dampen antral contractions and pyloric opening. Solids also slow the process because they must be ground into small particles before passing through the pylorus. Acids in the meal contribute to slowing as well through feedback mechanisms that coordinate digestion with the small intestine. In contrast, liquids empty more quickly since they don’t require grinding, and distension of the stomach can promote faster emptying to relieve fullness, within physiological limits. So a fat-rich, solid, acidic meal slows emptying, whereas a mostly liquid meal with some distention speeds it up.