Chemical Reactions in Food!


Where does the matter come from when you grow?  You probably, immediately said, "Food!" When you eat food, how does the food(bread, meat, vegetables, fruit) become your arms, legs, skin, bones, etc.?

Today you will take a journey to find out how food allows us to grow!

As you take part on this journey, you will watch videos, take notes, and answer the corresponding questions!                                 




Task 1

Choose one of the time-lapses of growth to watch:

Time-lapse of a growing person

Time-lapse of a growing dog

Time-lapse of a tadpole development


Q: How do you think food affects the your body?



Task 2

Why does bread taste sweet after it is chewed for a while?





  1. Take a small piece of bread  and chew it.  Continue chewing and keep it in your mouth without swallowing.

  2. As you chew, pay attention to how the flavor of the bread changes.

  3. When you think you have the answer, you can swallow the bready mush.  


Analysis Questions:

As you chew the bread, you may have noticed that it slowly tastes sweeter - particularly the juice that is coming out.

Q 1: What do you think causes the bread to taste sweet after it is chewed for a while although it did not taste sweet initially?

Q 2: Do you think this is a physical change or chemical change?  Why do you think so? What is your evidence?




Task 3


Fill out the table below as you watch the link and read the articles on the four macromolecules of life.

Video: Biomolecules

  1. Carbohydrates - Carbohydrates consist only of carbon, hydrogen, and oxygen. They include starches and sugars and play an important role in our daily lives.

  2. Lipids - Lipids include fats and waxes. They are used for long term storage of energy in life forms.

  3. Proteins - Proteins are made up of long chains of amino acids. Proteins play an important role in nearly every process that takes place in cells, including making new cells and repairing old ones.

  4. Nucleic Acids - Nucleic acids make up long chains of components such as DNA and RNA. Nucleic Acids carry information and instructions such as genes for protein molecules to use.




Atomic Composition

(What atoms make up this type of molecule?)

Building Blocks (Monomers that they are made up of)

Main Function(s)







Nucleic Acids


Pick your favorite meal and explain the biomolecules included as well as how they affect the body.

Teacher Page

This webquest is intended to provide students with an understanding of the chemical reactions of food that take place in the body. The lesson is supported by the following standard:  MS-LS1-7. Develop a model to describe how food is rearranged through chemical reactions forming new molecules that support growth and/or release energy as this matter moves through an organism. This lesson is intended for students to complete at home. Enjoy!