Can Your Stomach Size Shrink?

Your stomach is constantly expanding and shrinking to accommodate your food. You can't consistently change its physical size by eating differently or in really small amounts. For example, not eating won't cause your stomach to shrink over time. And eating small amounts of food won't “shrink your stomach” either.

How long does it take for your stomach to shrink?

If you have a big meal, your stomach doesn't magically get bigger and stay that way—it shrinks back down to its previous size in about four hours or less as your food is pushed along to the small intestine, Staller says.

Does your stomach get smaller if you lose weight?

Q: Does my stomach actually shrink when I lose weight? A: Not exactly, but here's why you might feel full. Our stomachs have a reflex called receptive relaxation: As food enters your stomach, the muscles relax and expand out to accommodate more volume.