Why might the dietitian who is working with a client who wants to lose weight suggest that that person eat 5-6 smaller meals that contain plenty of whole foods such as fruits, vegetables, and whole grains daily rather than 3 larger ones that contain refined foods and calorie-rich beverages?
The rate of gastric emptying, or the time it takes for food to leave the stomach and enter the small intestine, is influenced by several factors including the volume, consistency, and composition of chyme. Large volumes of chyme increase the force and frequency of peristaltic contractions, which in turn increase the rate of gastric emptying. Therefore, large meals leave your stomach at a faster rate than small meals. An increased rate of gastric emptying can signal the brain that more food is needed. Also, the consistency of food (liquid versus solid) also affects the rate of gastric emptying. Because the opening of the pyloric sphincter is small, only fluids and small particles (< 2 mm in diameter) can pass through. Solid foods take more time to be liquefied than fluids and therefore remain in the stomach longer.
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