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22 Hands-On Digestive System Activity Ideas 

February 26, 2023 //  by  Mhairi Sim

Teaching about the digestive system is a great way to plan some opportunities for students to get hands-on with their learning. This classroom unit is the perfect time to get a bit messy with some super science experiments or to take part in any other engaging activities you can incorporate into their digestive system lesson plans. 

We have gathered 22 of the most exciting digestive system activity ideas for elementary students. Read on to learn more and start exploring this fun topic with your students!

1. The Dr. Binocs Show Digestive System Video

This fun video is a fantastic introduction to the digestive system. It looks at what happens to food once it enters our bodies and covers the different stages of digestion. Use this video as a hook for your lesson or as a fun plenary. 

Learn More: Peekaboo Kidz

2. Hands-On Digesting System Experiment

This interactive activity is sure to be a memorable one as it offers a hands-on look at the digestive tract! This fun activity prompts students to replicate every stage of digestion; from ingestion to expulsion and even includes an intestine simulation using pantyhose.

Learn More: 123Homeschool4Me

3. How The Stomach Digests Food Experiment

This activity using zip-lock bags gives students a great look at what happens to the food in our stomachs during digestion. All you will need is some zip-lock bags, clear soda, and different types of food for this fun, hands-on lesson about digestion.

Learn More: Gift of Curiosity

4. Digestive System Craft

Using a straw, some string, and some paper digestive organs, students can stick all these items into an outline of a person to create this 3D model of the digestive tract! 

Learn More: Living Life and Learning

5. DIY Digestive System Demo

This demonstration shows how the digestive system processes various food mixtures from start to end using everyday household items. This is perfect to show students before they complete this activity for themselves, or to show if you don’t have the time or space to complete this interactive activity in class.

Learn More: Kristelle Marie

6. Digestive System Labeling Activity

A labeling activity is a fantastic opportunity for students to demonstrate their knowledge by identifying different digestive organs. Students could also draw their own pictures rather than label them on a pre-made worksheet.

Learn More: Pinterest

7. Where Do The Organs Belong? Worksheet

This worksheet allows students to place individual organs in the correct place in the digestive tract. They can then label the organs once they have cut them out and stuck them into the correct position.

Learn More: Worksheet Place

8. Stomach in a Bag Experiment

This fantastic activity replicates the effect that acids have in breaking down food once it enters the stomach. Using just a balloon, some water, oil, and oats, this activity is low-cost and easy to use as a resource for each learner in your whole class. 

Learn More: Gameschool Academy

9. Play Dough Digestive System Modelling 

These printable human body worksheets are the perfect resource for a whole host of creative digestive system activities. One such activity is to laminate these sheets and create a play dough mat for students to recreate a 3-D image of the digestive system.

10. Fun Digestive System Sensory Activity

This super simple sensory bag activity is perfect for younger students. Not only does it teach them about the digestive tract and where our food goes, but it also strengthens motor skills as students push the “food” through the drawn-on digestive tract. 

Learn More: Tasks Sheet Design

11. Bile Breaking Down Fat Experiment

This super experiment demonstrates the effects of stomach acid and food enzymes and how they break down fat in the digestive tract. All you will need to complete this activity is some milk, food coloring, dish soap, and a cotton ball. 

Learn More: Simple Southern

12. Digestion Game

This fun board game is a great tool to test student’s knowledge about the digestive system. Students could also create their own games in groups or as long-term homework tasks. They will then have heaps of fun playing each others’ games and seeing who knows the information the best! 

13. Printable Life-Sized Organs

These printable, life-sized body organs are great for demonstrating what our digestive organs actually look like; displaying their size and where they fit into our bodies. These printables are also great for making a larger-scale display for your classroom.

Learn More: Adventure in a Box

14. Digestive System Labeling Worksheet

This printable worksheet is a cut-and-stick labeling activity that is perfect for younger learners as they get to grips with the new vocabulary involved in this topic. Learners will quickly learn the names of the digestive organs with this great resource. 

15. The Digestive System Educational Video

This video is an amazing watch to introduce the key facts about our digestive system and what happens to our food during digestion. You could build on this video by creating a list of comprehension questions for students to answer after viewing the video.

Learn More: Happy Learning English

16. Digestive System Crossword Printable Worksheet

This entertaining puzzle worksheet is a great way to fill some time at the end of a lesson and consolidate vocabulary learned in a lesson. This activity is a relaxing and calm plenary for older students. 

Learn More: St. George Hub

17. Digestive System Flap Book Activity

This exciting flap book activity is a fun way for students to demonstrate and display their learning about the different parts of the digestive system. You could use a specific template or let your students get creative and come up with their own designs. Under each flap, they can write facts or explain what functions specific parts carry out during the process of digestion.

Learn More: Teaching in Room 6

18. Digestive System Worksheet

This worksheet is a great activity for slightly younger students. Students need to match each picture with the organ associated with digestion, and then order the different stages of digestion. This is a super way to assess individual learning before progressing through the topic or moving on.

Learn More: Live Worksheets

19. Digestive System Apron

This apron is a super idea to complete with your students. Your students could complete one per group, using diagrams for guidance, or you could complete one yourself and have it in your classroom for students to put on and learn about where their different digestive organs are!

Learn More: Musely

20. Digestive System Quiz Video

This quiz is packed full of digestive system questions for students. This is the perfect activity to gauge understanding and knowledge of this topic. 

Learn More: Kids Scholar

21. Play Dough Anatomy Activity

This activity cleverly recycles a plastic mold commonly found when buying a bathing suit. Draw the outlines of digestive organs on the mold using a  permanent marker. Then, your students can use play dough to fill in the gaps and create the organs.

Learn More: Teach Beside Me

22. Digestive System Activity Pack

These engaging activities are a perfect addition to any lesson plan on the digestive system. This free pack has activities ranging from labeling and color-by-numbers to reading comprehension passages with questions.

Learn More: Teachers Pay Teachers

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Easy Human Digestive System Model

October 26, 2019 By Emma Vanstone Leave a Comment

The digestive system is made up of several organs working together to make an organ system ( digestive system ). This activity shows how to make an easy digestion system model using food and tights!

This activity can also be found in my book Gross Science !

What is Digestion?

Digestion is the process by which large, insoluble molecules of food are broken down into smaller, soluble molecules that the body can use.

Digestion starts in the mouth, where food is broken into smaller pieces as people chew. Food is mixed with saliva, which contains an enzyme called amylase. Amylase starts to break down carbohydrates in the food.

Food then passes down the oesophagus and into the stomach . The stomach contains stomach acid and more enzymes which break up the food further. Stomach acid is actually hydrochloric acid which kills most harmful bacteria and provides the optimum pH for enzymes to get to work.

As food is slowly released from the stomach into the small intestine, the liver adds alkaline bile to the mixture. This neutralises the stomach acid so as not to harm the small intestine and helps to break up fats.

The pancreas makes three digestive enzymes which are also added to the food mixture. These are:

Protease for digesting proteins.

Carbohydrase for digesting carbohydrates

Lipase for digesting lipids.

The small intestine produces even more enzymes to continue digesting proteins, carbohydrates and fats. Nutrients are absorbed through the walls of the small intestine and transported to cells in the body by the blood.

In the large intestine, water is absorbed from food, and undigested food is passed to the rectum as faeces.

The final part of the journey is when the faeces pass out of the anus, hopefully into a toilet!

The small intestine absorbs nutrients  from food , and then the large intestine absorbs water and any nutrients not absorbed by the small intestine .

Undigested food becomes faeces or poo, which are excreted from the body via the rectum and anus!

Easy digestive system model using tights

You can make a very simple digestion model using one leg of a pair of tights as the small intestine .

What you need to make a digestive system model

Potato masher – or something else to crush the food with.

One small banana or piece of bread

One plain biscuit

Yoghurt- optional

Jar or bowl

30ml orange juice

Green and red food colouring – optional

Medium-size sealable bag – stomach

I leg from a pair of tights  – small intestine

Tray or plate

Digestion Model Instructions

Place the biscuit and banana into a bowl and gently crush with a potato masher. This represents the food being chewed. Pour the crushed food into an empty plastic bag and add the water. The water represents saliva.

Pour the orange juice into the bag ( this represents stomach acid). Seal the bag to prevent air from entering.

Squeeze the bag for about a minute, crushing the biscuits and banana further. This represents the food breaking down further inside the stomach.

Once the stomach contents feel like a thick liquid, cut a small hole in one corner and carefully squeeze into the open leg of the tights ( small intestine ).

At this point, you can add a little red and green food colouring, but this is not necessary. The red food colouring represents dead red blood cells that are being disposed of, and the green represents bile , which is released by the liver .

Hold the tights over the tray or a bowl and gently squeeze the liquid out. The liquid on the tray represents the nutrients the body absorbs and uses.

Keep squeezing until no more liquid comes out. If you used food colouring, wearing gloves for this part might be a good idea.

The food left behind in the tights represents waste products that cannot be absorbed.

Cut a hole in the bottom of the tights and squeeze the contents into the jar. This is the poo!

Digestive System Model Challenge

Change the food you “digest” and investigate to see if you can make a different colour poo!

Did you know the stomach walls are made of muscle, which mixes the food, helping to break it down?

The small intestine contains lots of thin structures called villi. These give a very large surface area to absorb food molecules.

Digestion in a Nutshell

Food is initially broken down in the mouth as you chew, helped by amylase ( an enzyme found in saliva )

It then passes down the oesophagus into the stomach, where it mixes with stomach acid and enzymes .

The liver makes bile to help break up fats and neutralise the acidic mixture heading to the small intestine from the stomach .

The pancreas adds more enzymes to the mix.

Food is broken down further in the small intestine, where small usable molecules are absorbed through the small intestine walls into the blood.

Water is absorbed by the large intestine .

Waste products are expelled via the anus !

If you enjoyed this activity, I have lots more human body investigations suitable for kids of all ages you might like.

Last Updated on September 18, 2024 by Emma Vanstone

Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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Digestive System Experiment

This short film clip follows primary school teacher, Danny, as he demonstrates a practical experiment which recreates the digestion process in the classroom. Using household items such as paper cups, orange juice and a pair of tights, this demonstration enables children to visualise the process of digestion in an engaging, practical way. This resource has been provided by Reach Out CPD, a programme developed by Imperial College London in partnership with Tigtag.

You may also be interested in our online, self-paced course  Teaching primary science: body processes.  

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Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.

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Explore Food Breakdown in the Mouth: Fun Digestive System Kids Experiment

In this hands-on digestive system experiment, children will explore the process of the digestive system and breaking down food in the mouth by mimicking the actions of saliva and teeth. They’ll gain an understanding of how our bodies start to digest food before it even reaches the stomach!

Exploring Food Breakdown in the Mouth: Fun Digestive System Kids Experiment

Supplies needed:

-Saltine crackers or bread slices (1 per child)

-Plastic zipper-lock bags (1 per child)

-Small cups of warm water (1 per child)

-A timer or stopwatch

-Markers, crayons, or colored pencils

Instructions:

Step 1: Start by discussing the importance of chewing food and how the process of breaking down food in the mouth is the first step in digestion.

Step 2: Give each child a plastic zipper-lock bag and a saltine cracker or bread slice.

Step 3: Instruct them to place the cracker or bread slice into the bag, representing the food they want to “digest.”

Step 4: Ask them to take a small sip of warm water and swish it around their mouths before spitting it back into the bag. Explain that this simulates the action of saliva, which contains enzymes that start breaking down carbohydrates in our food.

Step 5: Seal the bags and set a timer for 2 minutes.

Step 6: During the 2-minute “digestion” period, encourage the children to gently knead and mash the cracker or bread slice inside the bag, mimicking the action of chewing.

Step 7: After 2 minutes, ask the children to stop “chewing” and remove the cracker or bread slice from the bag.

Step 8: Gather the children for a group discussion about what they observed during the experiment.

Step 9: Ask them to describe the changes they noticed in the cracker or bread slice after simulating the chewing and saliva process.

Step 10: Emphasize the importance of chewing food thoroughly to aid in digestion and nutrient absorption.

Step 11: Discuss how the experiment relates to real-life food breakdown in the mouth and why it’s essential for good digestion.

Step 12: Have the kids draw and label diagrams of a mouth and the food breakdown process to reinforce their understanding.

Snap a pic and show us how it’s done! We’d love to see you try out this experiment. If you do, tag us on Facebook or Instagram!

Find Little Medical School of the Treasure Coast classes near you:

https://littlemedicalschool.com/treasurecoast/events/

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Lesson Idea

Teaching the Digestive System by “Making Poop” with Your Students

Are you looking for a fun way to cover the human digestive system in your elementary or middle school biology classroom? Try this hands-on activity suitable for kids of all ages.

Materials and preparation

• Banana (½ per group)
• Crackers (3-4 per group)
• Lemon juice or clear vinegar (to represent stomach acid)
• Zip-lock plastic bags
• 1 cut-off leg of tights/stockings (i.e. small intestine)
• Gloves – small size (1 pair per student) 
• A tray or large bowl
• 1 paper cup with a hole (i.e. large intestine), additional paper cup as a plunger
• The following handout with instructions (edit depending on the students’ age): Save a copy of the file to edit it.

Time requirement

You will have to adjust based on the class level. In most cases, you will need:

• 10-15 min at the beginning of class to briefly go over (or review) the route the food takes.
• 20-40 min for the hands-on activity (making the digestive system model). Older students will be able to follow the instructions in the handout themselves. Younger ones will need a lot of help.
• 5-10 min to clean up.
• 20-50 min for the reading assignment, which can also be done for homework.

Lesson plan

At the start of class, show this diagram of the human digestive system on the board.

Begin a discussion by showing the bananas and crackers and asking:

• What happens when we eat our food? It goes into our mouth – then the stomach – intestines – and then we poop it out.
• But it looks different when it comes out! It is mushy, mixed up, has a different color, and smells different. Where does this difference come from? All the healthy ingredients are gone. Where are they?
• Somehow, we broke down the food and absorbed all the healthy ingredients. How did this happen?
• Let’s make our own model of the digestive system and see what happens at each step along the way.

It’s a good idea to show the route the food takes through the digestive tract by tracing with your finger on the diagram on the board. Refer to it frequently during the hands-on activity to make sure the students know where along the way they are at each step.

This activity was developed based on other online lesson ideas found here .

Reading extension

This scientific article is a suitable follow-up assignment for middle school and lower high school students. It is a good occasion to discuss the gut microbiome and how to properly design a scientific experiment .

Can microbes make fruit flies stronger?

Check our website for even more microbiome-related scientific articles .

• February 24, 2020

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Check out this related lesson idea, how to use scientific articles in class.

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Categories Anatomy Activities

Digestion Experiment for Kids- DIY Stomach Model

Digestion Experiment for Kids: Easy Stomach Model

• Ages: Preschool , PreK , Kindergarten
• Difficulty: Easy
• Learning: STEM , Anatomy , Scientific Method

How does our body break down food?

This is a good question for kids. They know that they eat food and chances are they have heard a lot about how they need to eat healthy food to get energy.

Most likely they’ve heard that their stomachs play a role in how they get energy from food too. But how does it all work?

We don’t have to go into super deep detail at the preschool, kindergarten, or lower elementary level, but we can give an idea of how our stomach breaks down our food.

Here is a fun and super easy digestion experiment for kids.

What's In This Post?

Digestion Experiment for Kids

Supplies for your stomach model digestion experiment, running your digestion experiment, experimental set-up, running your stomach experiment, observation and data analysis, rugae (stomach muscles), stomach juices, our results, scientific method, let’s find your next fun activity, printable instructions, instructions, tips and safety.

This digestion experiment is a great way to talk through how to run a basic science experiment with your kids. There is a clear experimental setup, control group, and variable groups. Plus this experiment can be done pretty quickly, which is perfect for young children.

Don’t worry, this is so simple because everything you need for it can be found in your kitchen. It’s easy to decide to do this one last minute, which is helpful with littles.

Here is what you are going to need.

• 4 Resealable Baggies
• 4 Slices of Bread

Yep, that’s all it takes to do this fun project. And you can make substitutions. Try crackers, cereal, even chips if you don’t have bread to use. Just something carby and crushable.

How To Set Up Your Digestion Experiment

Time to set up our experiment. As we get started there are a couple of vocabulary words to make sure we know.

Control: The control group in an experiment is the group that you don’t do anything special to. You set it up like the rest of the experiment, but then just leave it. No big changes at all.

The control group helps us see if what we are doing in the experiment is actually having an impact.

Variable: The variables are what we are changing. In a scientific experiment, you want to change only one thing at a time, if possible. This way we know the effect comes from the change we made, not from other reasons.

Short version? Control is where you run the experiment without changing anything. Variables are what you do change.

Step 1: Label your 4 bags as follows: Control, Dry, Wet, Mixed. We also drew a stomach outline on the bag for fun, it’s an optional step.

Step 2: Put a piece of bread into each bag.

Step 1: Take the control bag and set it aside. Don’t do anything to this bag.

Step 2: Take the dry bag and have your child squish it up with the bread inside. Once they have squished it for a few minutes, set it aside.

Step 3: Take the wet bag and add 1/4 cup of water. Gently move the bag around so more of the bread comes in contact with the water. Set this bag aside.

Step 4: Take the mixed bag and add 1/4 cup of water. Seal the bag and have your child squish the bread with the water in the bag too.

You will love these activities too!

Now that we have performed our experiment, it’s time to look at our data!

For this experiment we are just using our visual observations as our data.

Take a look at all your ‘stomachs.’ Which bread looks like it is the most digested? Compare the bags to each other and to the control bag.

Ask your child what they see. Does the bread stay in one piece? Does it look broken down or intact? Which bag is the most broken down?

Encourage your child to feel the bags further. How does the bread feel in each bag? Is one squishier and more broken down than the others?

What you will most likely see is that the bread in the mixed bag, the bread that was wet and squished, is the most broken down. This makes sense when we think about how our stomachs actually work.

What did your child observe?

How Our Stomachs Digest Food

Our stomachs work a little differently than this experiment, in that we chew up our food before we digest it, but the main idea holds true.

When our food gets to our stomach it digests in two main ways, through stomach acids and through muscles actually contracting around our stomachs. (Yes, this is a simplified explanation. But it’s a good one for little ones.)

Stomachs have ridges of muscles all around them called rugae , and these aid in digestion.

Your teeth break food down into smaller chunks, and your stomach muscles help move that food around to further break down.

In our experiment we used our hands to physically break down the food in our stomachs.

Our stomachs aren’t just dry sacks that use physical force to break down our food. There are also chemical reactions at play, made possible by different stomach juices.

Hydrochloric acid breaks down a lot of the food so we can digest it and get the nutrients we need. There are also digestive enzymes that have specific jobs like breaking down proteins.

In our experiment, we used water to represent the stomach juices. The water helps break down the bread even without having to physically manipulate the bags.

When we used both methods, water and smooshing the bread, we had the most digestion take place. This is why our stomachs use both muscles and digestive juices to digest our food.

Try these next!

This is an amazing activity to practice the scientific method. Even if your child doesn’t grow up to be a scientist, they learn so much from understanding this method. (Learn how here: Life Lessons from the Scientific Method )

• Question: Kids are naturals at this step, they are full of questions. What do they want to know about how we turn food into energy?
• Observe: Before we make a hypothesis, we observe. What does your child see from their bodies? And what do they see from their experimental setup?
• Hypothesis: A hypothesis is your best-educated guess at what is happening. Which bag does your child think will digest the bread best?
• Experiment: Run your experiment! This is where we test our hypothesis. Time for hands-on learning fun. Gather your data.
• Data Analysis: Look at your data. What do you see? This can include further observations from watching the experiment happen and numerical data, it just depends on the experiment.
• Conclusion: What conclusions can we draw from this? Which way digested the food the best?

Get Experimenting!

This is a great activity to start kids on real experiments. Encourage them to try again with different foods or different setups. Ask them what they observe? What do they think happens?

And get ready to watch your little scientist bloom and explore.

Want to make this even easier? Print out the directions for easy reference!

Stomach Digestions Experiment for Kids

Help your child learn how our stomachs digest food with a fun and easy experiment!

• 4 Pieces of Bread
• Label your bags: Control, Dry, Wet, Mixed.
• Place a piece of bread in each baggie.
• Take the control bag and set it aside.
• Take the dry bag and squish up the bread in it for a few minutes, then set it aside.
• Next, take the wet bag and add 1/4 cup water to it. Gently swirl the bag around to coat the bread, but do not squish it. Set aside.
• Take the mixed bag and add 1/4 cup of water. Then squish the bread like with the dry bag.
• Observe and compare all 4 bags. Which bag broke down the bread the most?

This is a pretty safe experiment. It is always a good idea to have adult supervision when doing science though.

The key to this experiment is observation. Ask your child what do they see and feel in the bags. Have them touch the bread through the bag to compare the textures. What do they think happened here?

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Digestive System – Experiment at Home

You will need:

• Baked beans
• A bowl or tub
• Potato masher
• Pair of tights
• Scissors (ask a grown up)
• Sandwich bag
• Vinegar or lemon juice

• FOOD – empty your baked beans into your bowl and crumble in your biscuits (yum!).
• SALIVA   – your spit helps to break down your food! Pour a little bit of water into your bowl.
• TEETH – Mash your food up using your potato masher. Or, if you don’t have one, use something like a fork or even your hands!
• STOMACH – Your food travels down your oesophagus (throat) into your stomach! Pour your “food” into the sandwich bag. Your stomach has acid in it, so pour in a bit of vinegar or lemon juice to be your stomach acid.
• Your stomach is always squeezing and releasing (that’s why your stomach rumbles) so give the bag a squeeze to keep breaking down that food!
• * MESSY BIT* INTESTINES – You have two intestines – small and large. The small intestine absorbs nutrients – the good stuff that your body needs. The large intestine absorbs moisture – it gets the liquid out! Open one leg of your tights and pour your stomach contents into the tights (you may need someone to help).

• POO – The intestines is where it turn into poo! If you move the food too slowly through the intestines, too much moisture will be absorbed and your poo will be too hard and dry (constipation), bit if you move it too quickly, it will be too wet (diarrhoea).
• RECTUM – Otherwise known as your bottom! This is where the waste (poo) leaves the body. Cut a small hole in the end of your tights and squeeze the ‘poo’ through it.

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