Much of the food you eat is absorbed by your digestive system , which includes your stomach and your intestines.

But some of what you eat makes it all the way through those twists and turns and comes out the other end as poop. How does that happen?

Imagine you start your day by eating a bowl of crunchy cereal with milk. The process of digestion begins as you start to chew.

Your teeth grind up the cereal into smaller particles, making it easier to swallow and digest. Your saliva contains an enzyme, a kind of chemical, called amylase that starts breaking down the cereal on a molecular level.

I'm a doctor who regularly treats children and adults with digestive problems . Some of my patients have problems absorbing nutrients from their food and others poop too often or not often enough

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