How does nutritional composition affect physiological functions?

Your body is like a machine, and what you eat is like the fuel that keeps it running.

Imagine your body as a toy car. If you give it candy, which is like sugar, it zooms off really fast, but then it stops quickly because the fuel runs out. But if you give it whole grain bread, which has carbohydrates, proteins, and fiber, it moves smoothly for a long time.

Foods are like different kinds of blocks that help your body grow, think, and move.

• Protein is like the building blocks for muscles, just like bricks build a house.
• Vitamins and minerals help your body do special jobs, like keeping your bones strong or helping you see clearly.

If you eat mostly sugary snacks, your body might feel tired and grumpy. But if you eat lots of fruits, vegetables, and whole grains, your body will have more energy and be happier all day long.