Here's
the
idea:

When we eat, our bodies break down the food and chemically change it to make it usable for our needs.

Some of it gets turned into the stuff that builds our bodies but much of it is burned to produce energy.

We use this energy to power our bodies and for our everyday movements like breathing, walking and talking.

We can measure how much energy we get from different foods.

Just as we use a “mile” to measure distance and a “pound” to measure weight, we use a “calorie” to measure food energy.

Every day you take in calories from the food you eat and burn them when you move.