Food provides the energy for all of our body's functions like breathing, muscle movement, and thinking through internal processes that break it down. To demonstrate that food is a source of energy, the document proposes some simple experiments, like using potatoes to generate heat as a clock or as a replacement for batteries, to show how food can be directly used for energy needs.

1. FOOD AND
ENERGY
How Do We Use The
Food We Eat?

2. Every moment of your life, whether
awake or asleep, you are using
energy for muscles, breathing,
powering internal body processes,
and even for thinking. Where do you
get that energy? The answer is
simple: food.

3. But how can we be sure that
food is energy?
If food is energy, we can use it to
heat or instead of batteries.
Let us do some experiments!

4. Heat and eat

5. POTATO CLOCK

6. POTATO CLOCK