Inside the Digestive System - What actually happens to food once you eat it? This video follows the journey of digestion from the first bite in your mouth to the final stage of elimination. Step by step, it shows how food is broken down, moved through the body, and turned into energy your cells can use. You’ll see how chewing and saliva start digestion, how muscles push food through the esophagus, how the stomach breaks it down with acid and enzymes, and how the small intestine absorbs nutrients