Digestion turns food into usable materials — Biology, 7–10 years
Food cannot help the body while it is still in large pieces. Digestion breaks it into smaller substances that can pass into the blood and be used for energy, growth and repair.
The journey of food
Digestion is the body’s way of preparing food for use. Teeth crush it, the stomach mixes it, and the small intestine takes useful substances into the blood. What the body cannot use travels on and leaves as waste.
Why break food apart?
A sandwich is too large for the blood to carry through the body, but its smaller nutrients can travel. Digestion solves this size problem. It also separates useful materials from parts such as fibre, which the body cannot break down fully.
Worked example: a bite of bread
First, teeth crush the bread and saliva wets it. In the stomach, muscles mix it with digestive juices. In the small intestine, starch has become smaller sugars, which cross into the blood. The blood carries them to cells for energy.
Trap: the stomach does all the work
Because a stomach can feel full or hurt, it is easy to think digestion happens there alone. In fact, chewing starts the process, the stomach continues it, and the small intestine absorbs most nutrients. Several organs share the job.
Digestion in everyday life
Knowing about digestion helps explain why chewing well, drinking water and eating different foods matter. Doctors use this knowledge when helping with stomach or intestine problems. Food labels also describe nutrients that the digestive system can make available to the body.
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