Watch what happens when you boil soda and fruit juice. Amaze all your school friends.

Sugar Science Fair Project

My son recently competed in his school science fair, I thought it would be interesting to share his results here, and it might give some tips for anyone wanting to conduct a similar science fair project on sugar.

Science fair projects are increasingly popular as people are becoming aware of just how much sugar is in everyday foods and drinks. It is fun to do and children love the shock tactics of hidden sugar.

I was amazed this year how many science fair projects were related to sugar in some way. It’s a hot topic and that is fabulous that kids want to get on board. And seriously, if you want your children off soda and juice, DO get them to try this at home (with adult supervision of course).

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  1. 600ml (20 fl oz) of each soda and juice were measured. This is a common bottle size, but nowhere close to the 2.5-litre bottles some people drink. Each soda and juice was boiled down leaving the sugar remaining. My son wanted to see just how much sugar is in soda and in fruit juice, and if fruit juice is any healthier.
  2. Ask if adults could guess how much sugar is in foods that many people consider to be ‘healthy’


Watch this video I put together of him boiling soda and juice, but there is a warning, you may never drink soda or juice after watching this. It really brings the message home that these drinks are nothing but liquid sugar in a bottle.

That sticky horrid mess left over at the end, he popped into sealed bags for everyone to see. His sugar science fair project is now on permanent display in the science block.

You may notice the gloopy sticky mess that soda and juice become once the water has evaporated. This alone should put you off them. The sugar found by his experiment is pretty close to what the nutrition labels state. It shows the incredible sugar contents of these drinks.

Most have 20 TEASPOONS of sugar. Now I don’t know about you, but I sure won’t be giving my children 20 sachets of sugar when they are thirsty!

And don’t think juice is a healthy option. Sure it may contain some vitamins, but there is no fibre and most are heat treated or made from concentrate. Drinking a glass of juice isn’t the same as drinking the goodness of 6 oranges, it’s the same as drinking the sugar of 6 oranges. Eating whole fruit with it’s fibre is self limiting, juice is not.

Coke 65g (16.25 tsp) – Fanta 83g (20.75tsp) – Orange Juice 80g (20 tsp) – Grape Juice 80g (20 tsp)

By drinking one 600ml bottle of juice or soda, children are drinking almost an entire weeks worth of their recommended daily intake which is 3 tsp/day.

How to display

As you can see by these graphs, not many adults managed to guess how much sugar was in these ‘foods’. The majority of adults underestimated their sugar content by a considerable amount. Remember – read the back (nutrition) of the packet not the front (advertising fluff and wonder).


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  1. Libby,
    Well done, Libby’s son! I work at a high school where health class is mandatory. I have shared this with some teachers and will share with more people tomorrow. And the video ….it needs to go viral!
    I book mark your recipes. Have made your Fat Head pizza 3 times. I know, I should try your cauliflower crust version, and eventually will, but your Fat Head recipe is so darn good.


    1. Gosh Dee thank you so much. I love going through the comments each morning and yours is really special. My son is loving that his project is getting so much attention and so many mums and teachers have been commented on different Facebook groups how they want to do a similar project. I think the visual aspect of it really hits home. We had to buy 1kg of sugar just to fill those bags! And getting your children to boil soda and juice is so much fun and they really understand why I will not let them have soda or juice anymore. By doing more of these projects, I really feel the sugar free message is slowly becoming mainstream and the shock tactics of all that hidden sugar is really making people read their nutrition labels too. Thanks again for your kind words Dee. Libby x

      1. Hi Libby, love this project! What do the graphs depict? I couldn’t magnify the pictures so I could not see what was being measured on the graphs. Thanks!!

        1. The graphs show each participant’s estimate of the sugar in each food, then the red line is the actual amount. A few overestimated, but the majority underestimated incredibly.

          1. This is great !!!!!!!!!!!!!!!!!!1

          2. Thanks Bob. My son had a fun time doing it too. It was incredible to see how many science fair projects are based on exposing sugar and junk food each year. It’s encouraging.

  2. Very well done to your son! Amazing work he did, he should be very proud 🙂 And hopefully he has taught his classmates (and teachers!) a few things too 😉

  3. Wow that certainly brings home how unhealthy the drinks are, much more than the little plastic bags of sugar. Well done to your son.

  4. Great idea! I definitely agree that there is a heightened awareness around the sugar content in our foods… now we just need people to understand that complex carbs turn into sugar in our blood and have the same effect as simple sugars!!! I wonder how we could turn that into a science project?

  5. amy ansel says:

    i’m so happy to have found this post, bravo!! so excited to see awareness, i remember charts like these when i was little, it had captain crunch and stuff… it really never sunk in how bad it was for me. I’m starting a ketosis lifestyle very soon, and i can’t wait to experience a new realm in wellness.

    1. john hebert says:

      Ketosis diet saved my life

  6. What a great post Libby.
    Well done to you, and especially your son, for highlighting much needed awareness.

    All the best Jan

    1. Thanks Jan. He is loving the fact that so many people want to do something similar and he is loving the comments flooding in from all over the world.

  7. Brilliant work! If he ever fancies comparing snack bars send him our way 🙂

  8. Hi Libby! My daughter is looking at doing this for her science fair project also. Can you please give the steps you took in boiling down the drinks? At what point was it taken off the heat? Also, how did you get it into the bags then without the plastic melting?

    1. Awesome Cindy, you daughter will have fun doing this. My son weighed the pan cold before adding the soda so he knew it’s empty weight. He then added the soda and boiled it down, stirring occasionally until no more steam evaporated. At this point you keep the heat low as you don’t want to burn it. Once it was cold, he weighed the pan again with the remnants of the soda sludge (sugar) and deducted the dry weight from step one (you can’t weigh a warm pan as it will make the electric scales fluctuate and give an inaccurate reading). You can then put the pan back on a very low heat, just enough to warm the soda sludge (it hardens when cold) but not hot enough that it will burn the plastic bag. Luckily at this point you already know the accurate weight of the sugar so you only need to get as much as you can into the bag for demonstration purposes, you will never remove 100% as it is a gloopy mess. Wash in really hot soapy water and repeat the above for all the soda’s you’re testing. Good luck and feel free to ask any more questions. Libby.

    2. lol I’m in high school and doing this last minute. However I found it helpful to use a small plastic container to put it in afterwards that way people can actually touch the stuff that is left behind

  9. Hi there Lbby, great science fair idea! I’m looking to this with my kids who have just started high school. How did you determine the total amount of sugar left behind after boiling the liquid?

    1. Great Rob, I would love it if this inspired someone else to do this. It’s great fun.
      Weight of pan with boiled down sugar gloop (g) – weight of empty pan to begin with (g) = Sugar (g) in the soda (once boiled down and all the liquid has evaporated).
      You have to wait until the pan is cold enough to put on the electric scales and the heat won’t affect the accuracy and weight (which may make scales fluctuate). To remove the sugary gloop from the pan afterwards, just warm enough so it is soft, but not remotely hot, then put the gloop into bags to add to the science display. There may be a small margin of error in this if you don’t make sure that all the liquid has evaporated, but if you are gentle with the heat towards the end, you can see when all the steam has stopped escaping and the sugar suddenly turns toffee like. My boy was only 11 when he did this so maybe if he was in secondary school, he may have done it a little more scientifically with a moisture meter, or such. I hope this helps, Libby.

      1. What grade level is this for???

      2. What research websites did you use.

  10. It is so amazing to know how much sugar we intake in every junk food that we eat.Thank you so much for the info.

  11. Thanks so much for sharing!! My son has a science fair project coming up and he wants to do this!!


  13. Love the idea!! What was his hypothesis?

  14. Marinette says:

    Hi! I wanna know what hypothesis you made for this project? Thanks! 🙂

    1. It was that most people would not realise how much sugar was in foods that many would regard as healthy. Also people would be unaware of how much sugar is in soda and juice.

  15. Libby , In which section of science is this project in ?
    Eg. Physics,Chemistry or Biology

  16. george456 says:

    okay so im seriously comfused i have to wright a huge 5 page letter about this and now i have no clue what to do because i cant find any of the information any where

  17. Thremene B. Murphy says:

    Hey, i can’t see the steps for the experiment from the board. Any way u can see it to me?

    1. The video pretty much shows what he did. He just boiled the same quantity of soda or juice. Once all the liquid has been evaporated, you calculate how much sugar by using the equation “weight of the pan with sugar – weight empty pan = sugar”. The majority of his experiment was actually asking a variety of people to guess who much sugar was in foods that most people regard as a healthier option.

      1. What would I use to weigh the pan?

  18. Hi Libby! I was wondering, for the “weight of the pan with sugar – weight empty pan = sugar” thing, what would I use to weigh the pan? I’m doing this for my science fair project, and it doesn’t say what kind of scale I would use to measure it.
    Gigi 🙂

    1. Oops! Where I said “and it doesn’t say what kind of scale I would use to measure it.”, I meant weigh not measure because I need to know how to weigh it, not measure it. Sorry about that!
      Gigi 🙂

  19. I am doing this for my science fair. How do you measure how much sugar is in the soda once you have the goo from boiling.

    1. The formula is above, but you weigh the empty saucepan, then again once you are left over with the sugar ‘goo’ in the saucepan. Deduct the empty pan weight from the sugar filled saucepan weight = sugar (approximately, it’s not a rigorous scientific experiment here, just a really excellent school project that gets the message across).

  20. Christy Thornton says:

    I was wondering what orange juice was used resulting in the same amount of sugar as grape juice. All the orange juice I have found has 22 g per 8 oz serving according to the label which is considerable less than grape juice. It was also less than coke according to the label. We are also doing this as a science fair project. I haven’t done any of the boiling down of the drinks or weighing I was just calculating based on grams per serving per label to get an idea of what the results should be.

    1. The photo shows Mccoy orange juice and Mccoy grape juice. Both are pretty shocking yet count as a daily serve of fruit and veg. Unbelievable huh? It’s very hard to find their values as they are not on their company website (funny that). My son used the values from the packaging for the project.

  21. How did you find the measurements for the food?

    1. Which food in particular? I think he chose serving sizes from each packet for the snack food, and chose equal liquid volumes to compare for the boiling experiment.

  22. Jennifer Zorrilla says:

    What would the hypothesis be for this project????

    1. The main body of the science experiment was for people to guess how much sugar was in (what many perceive to be) “health foods” such as low fat yoghurt, dried fruit snacks etc. His hypothesis was that not many people would (and they were shocked as he revealed the answers afterwards). The boiling experiment was an adjunct to his project, a visual guide to shock his class mates. His school asked to keep the project and it is sitting in their science lab, so long may it put them off huh?

  23. My son is doing this proyect for the science fair where I can see all the proyect to have an idea how to
    do it. Is his first time doing this science fair . Thanks If you can send me at me email appreciate.

  24. Hi Libby!

    I want to do this for my science assignment at school. I tried it yesterday but it stuck to the pot that I used. Did this happen to you? Could you explain in further detail about boiling the certain beverages and if they stuck to your pan?

    Thank you very much for your help! 🙂

    1. Yes it does stick, and badly. I bought an old pan from the second hand thrift store. I weighed the pan empty, then weighed it again with all that horrid sticky sugar. Pan with caramelised sugar – empty pan = caramelised sugar. Once I had the results, then I would heat it gently to lift off the caramelised sugar, and washed the pan in hot hot soapy water. Repeat with each soda.

      1. of course where is your dumb hypothesis

        1. Gosh, what an eloquent and highly academic question you have posted for me today. I hope you are so direct and complimentary in real life, as you are online …. It was my son’s science experiment. I am very proud of him. He was 11. His hypothesis was that no one could guess how much sugar was in “healthy foods”. “How much sugar is in that?”

      2. Manuela A. Maco says:

        Hi Libby!
        I was wondering how you were able to remove the sugar off the pan into the Ziploc Baggies. I would really appreciate a prompt response from you!
        Thank you so much!

        1. Good question. My son weighed the frying pan before and after so to determine the weight of the sugar. Then he pulled out the sticky mess when it was warm and pliable but not so hot that it would melt the bag. The ziplock bags were for the visual element of his experiment. He didn’t need to extract every gram of it, he had already calculated that from weighing. Any leftover sticky mess in the fryingpan, he simply poured boiling water and detergent over to clean the pan ready for the next experiment.

    2. Katie Herring says:

      Hi libby. What was your hypothesis for this experiment.

      1. The main experiment was asking a selection of people if they could guess how much sugar was in the “healthy” foods shown on the graphs. The soda boiling experiment was an additional part of his project to highlight soda and juice.

        1. Hi Libby my question is what do the graphs show exactly?

          1. My son is sitting right next to me now (perfect timing) and he remembers they are showing how much sugar his participants guessed were in each “health food” compared to how much is actually in them.

    3. I did this with my daughter, the trick is not to boil it. let the liquid evaporate on low heat. I then poured into sample cups and put them in my dehydrator.

      1. so are you measuring how much other things are in there other than sugar or are you measuring the how much sugar is in a drink?

      2. Oh thanks that makes sense

  25. My school is asking for a Purpose to this experiment…did you have to do this?

    1. The purpose is to create a visual representation of the (supposedly startling) amount of sugar in common soft drinks; and whether or not “natural” drinks like juice are actually healthier than soda pops as far as sugar content goes.

      An earlier comment has made a valid point that the “experiment” needs a control. It also needs a hypothesis and subsequent analysis and findings/conclusion. The purpose of an experiment is to validate or invalidate the hypothesis; find it true or false. Without a hypothesis the experiment has no purpose other than it’s probably fun to simmer some Coca-Cola until it’s a bunch of glop.

      I would use a hypothesis like: “ Cola has more sugar per serving than Concord grape juice from concentrate.” Or perhaps that it does NOT. The hypothesis has to be a simple true or false statement it shouldn’t be overly complex like “cola has more sugar than conchord grape juice from concentrate but not when it’s sat out and the grape juice is welches and the cola is RC, but if it’s Coke it’s less because of acidity and…” make the hypothesis simple.

      The control is to show that the experiment has valid evidence. So something like a placebo is a common control, so using something like a diet drink or even just water which would boil down to maybe some minerals. Anyway record your results and then apply them to your hypothesis and see if you were right or wrong. It’s okay to be wrong! Just make a detailed analysis of why you were right or wrong and conclude with some forward thinking ideas of what your findings could mean for future experiments and how it applies to everyday life. Hope this helps! Remember don’t try and make a hypothesis you know will be correct just to get it right. Do something you think is intriguing! It’s onay to be wrong! Do something like Coca Cola has less sugar per serving than OJ from Concentrate. Who knows!

      The thing is you can figure this out by lookin at the nutrition facts so if you want boiling it down to apply to your hypothesis you need to include this in the hypothesis… so something like boiling down 12oz of Coca Cola will produce less sugary glop than boiling down 12oz of OJ… the weight of this glop will be consistent with the grams listed on the nutrition facts… idk lol

  26. Hi my daughter and her friend are doing this project for the science fair and they have to write a independent, dependent, and a controlled variable do you remember what your son put for them?

    1. My son didn’t have these requirements for his project, so sorry I can’t help you out with these. The only “control” he used was for boiling the soda, he used a diet coke.

      1. how did you measure the sugar to find out how much sugar was left?

    2. I think a cooler experiment would be to super saturate some Coca Cola with sugar so when you add one granule of sugar it will cause a chemical reaction that pulls all of the sugar out of the liquid so that the bottom half of the Beaker is pure white sugar and the top half is the cola now without any sugar. This would require stoichiometric calculations but be an awesome demo that would show all the sugar!

    3. The Independent variable = The Drink
      The Dependent Variable = Amount of sugar
      The Control Variable = The Amount of liquid that you are testing
      Variables = Amount of sugar

      1. your cool says:

        thank you for making my project more easier

    4. These are mine, I did them on different brands of mano juice
      Controlled Variable = the same amount of mango juice (200 milliliters)
      Independent Variable = the brand of mango juice
      Dependent Variable = the amount of residue in milliliters

  27. very nice experiment and its make sense. Nowadays children loved to drink carbonated drink and juice, and this experiment can teach them to do not drink it too much and try to avoid it. a small request from me, not only about juice or carbonated drink but maybe u can do some experiment about food. and i will waiting for that. because your experiment i’m using for my school children. thank you.

  28. Hi Libby,

    Great project. I want to do something similar could you send a picture of the whole board I wanted to see your setup, of course I’ll select different items.

    1. Tiffany D says:


      This was very helpful information. But I can’t seem to find the video mentioned.

  29. Hi Libby, what a great project! what drinks did you use to boil?
    Many thanks!

    1. Thanks Hannah, my son had a great time doing it. He boiled coke (to show how much sugar is in a small bottle), diet coke (to be a control and show no sugar is present), orange juice and grape juice (to show fruit juices are just as high in sugar than a regular fizzy drink).