The stomach is an incredibly flexible part of our bodies. Experts share how the digestive system works and why our stomach can’t shrink from hunger.
Sign up for our email newsletter for the latest science newsWith the gnawing emptiness that follows a skipped lunch, or a day of fasting in preparation for a big meal, you might wonder if that rumbling stomach of yours is actually capable of shrinking with hunger. After all, it sometimes feels like it.
One way we can see this, says Edwin McDonald, a gastroenterologist and assistant professor of medicine at the University of Chicago, is through computerized tomography scans. The stomach relaxes and expands to accommodate the incoming load, working like a well-oiled machine to mechanically and chemically break things down further. It stores swallowed air and foodstuffs, produces powerful acids to melt them down, and contracts to physically grind up the food into smaller bits.
Some surgical procedures remove part of the stomach, restricting the amount of content it can handle. Other procedures, McDonald says, involve suturing the stomach from the inside and making it physically smaller that way.However, natural processes such as hunger are not enough to shrink an already incredibly stretchy organ any further.
This is the principle driving certain weight-loss medications, which target the hormones in charge of stomach emptying and hunger cues.
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