Lesson video

Hello, my name is Mrs. Merin and I am so excited to be learning all about fats in food with you today and we are going to be reviewing our learning.

Welcome to today's lesson from the unit Healthy Eating.

Your learning outcome is, I can compare how much fat is in different types of food.

Now I know that learning can sometimes be a little bit challenging, but that's okay because it just means that we are going to work really hard together and we're going to learn lots of fabulous new things.

Let's begin.

So these are your three keywords for today, and alongside these keywords are definitions.

Now I am going to be referring to these throughout today's video.

However, if you find it helpful, you can pause the video here and you can jot these down.

Off you go.

Fantastic.

Well done.

So our lesson is split into two parts today.

Let's begin with the first part, recording the results of an investigation.

So Aisha and Lucas know that different foods contain different amounts of fats and they have observed, so they've seen and they've looked closely.

They have observed greasy marks on paper bags containing some types of food.

This is because fats in food are absorbed by paper and become visible.

And this makes it easy to identify which foods contain fats.

Now the children have been finding out how much fat is in different types of crisps, and Aisha says, "Our question is, which of the crisps that we tested contain the most fat?" Let's do a quick check-in of your learning before we continue.

Now remember, if you have done the previous lessons to this, you may remember the answer.

Don't worry, though, if you haven't.

So who do you agree with? Alex says, "It's easy to see which foods contain fats because they leave a greasy mark on a piece of paper." Sofia says, "It's easy to see which foods contain protein because they leave a greasy mark on a piece of paper." And Andeep says, "It's easy to see which foods contain carbohydrates because they leave a greasy mark on a piece of paper." So who do you agree with here? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

Alex is correct.

It's easy to see which foods contain fats because they leave a greasy mark on a piece of paper.

Now Aisha and Lucas remove the crisps and observe that all of the crisps have left a greasy mark on on the squared paper.

Aisha says, "Some of the greasy marks look bigger than the others." Now how can Aisha and Lucas compare the greasy marks produced by different types of crisps in an accurate way? What do you think? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

So Aisha says, "We could measure the width of each greasy mark." And Lucas says, "But some greasy marks are different shapes and some crisps have even left greasy marks in two places." So Aisha's older sister has carried out an investigation like this before and she says, "You can count how many squares are covered by each greasy mark." So the number of squares covered by each greasy mark can be compared.

So we've got the cheese corn crisp, salt and vinegar ridged crisp, and the popcorn crisp.

Now how could Aisha and Lucas record their results once they have counted the number of squares that have been covered by greasy marks? What do you think? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

So Aisha and Lucas use a table to record their results.

Is that what you thought too? So a table is one way that we can record information.

Now there are other ways that we can also record this information.

So they could have done a bar chart as well and they could have done it in a graph like that as well.

Now, why do we record results in a table? Why do you think Lucas might have chosen this one? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

So recording results in a table makes it easy to compare them.

And Lucas says, "We can compare the number of squares covered by each greasy mark to conclude which of the crisps we tested contains the most fat." So count the number of squares that are more than half filled with grease.

So do you want to have a go at that now? You can pop the video on pause and you can have a go.

Off you go.

Fantastic.

Well done.

So you might have found that a little bit tricky.

So you can use a system of marking off the squares as you count them.

So we've got eight and then 21, 42, 57, and then 65.

So you may have done that already, but if not, this is one way that you could do it.

So there were 65 greasy squares and this is your total.

So let's do a quick check-in of your learning before we continue.

How can we find out which crisps contain the most fat? Is it, A, by observing which crisp is the biggest, B, observing the color of the crisp, or C, by observing the greasy mark that it makes? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

The answer is C, by observing the greasy mark that it makes.

So it says count the number of squares covered by the greasy mask, mark, greasy marks.

That was a bit of a tongue twister there.

By the greasy marks covered for each crisp.

And I want you to record your table, record your results using your table similar to Lucas and Aisha's, or you can use your own table.

So you can either use the pictures on the previous slides, or, if you have done this investigation in the previous lesson, you can use your results and record them in this table or a table of your own.

So I'd like you to pause the video here and have a go at doing that.

Off you go.

Fantastic.

Well done.

So let's have a look at the results.

So yours may have been similar to this if you had done your own investigation, but if you'd done Lucas's or Aisha's then these are roughly what you should have got as your results.

Maybe one or two, either way.

So ready salted crisps, there were 166 squares.

Popcorn, 33 squares.

Lentil, 16 squares.

Cheese and onion, 175 squares.

Salt and vinegar ridged crisps were 270.

And the cheese corn crisp covered 65 greasy squares.

So now we are on to the second part of our learning today, which is evaluating an investigation.

So Lucas and Aisha look at their results, look at the results of their investigation, and Aisha says, "Our results show that the salt and vinegar ridged crisps produced the largest greasy mark at 270 squares." And she says, "Of the crisps we tested, it looks like these crisps contained the most fat." Lucas says, "The lentil crisp produced the smallest greasy mark at just 16 squares.

And of the crisps we chose to test, it looks like these crisps contained the least fat." So when scientists evaluate what they have done, they think about what they did and then they suggest any changes or improvements.

Now, how would you improve your investigation? What do you think? I'll give you five seconds to think about your answer.

If you need longer, that's okay.

You can pop the video on pause and then you can come back once you are ready.

Off you go.

Fantastic.

Well done.

So before we go into that, let's have a quick check-in of your learning so far.

So when scientists evaluate an investigation, they what? A, record their results, B, suggest changes or improvements, or C, do the investigation again.

I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

The answer is B.

They suggest changes or improvements.

Now, Aisha says, "I wonder if there is a way that we could check our results." What do you think? Again, I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

So the results of a scientific investigation can be compared to secondary sources that already exist.

So Lucas says, "We could compare our results with the fat content information shown on each packet of crisps." So Lucas orders his results from largest greasy mark to smallest and then adds a new column to his table to record how much fat each crisp contains.

So we've got the lentil with the least number of greasy marks all the way down to the salt and vinegar which had the most number of greasy marks.

The squares that covered that were the most.

And next to that he's put fat per hundred grams of crisps along the side.

So he says, "As they're now written in order, this should help me see patterns." So Lucas expects his table to confirm that the crisp that produced the largest greasy mark will contain the greatest amount of fat per hundred grams. What do you think? Have a good look at this table.

Is that what his table is showing him? If you need to, you can pop the video on pause.

Otherwise, I'll give you five seconds to think about your answer.

Off you go.

So for me, I think some of the most surprising results were the fact that the lentils, which left the least amount of squares that were greasy, actually has more fat per hundred grams of crisps than the popcorn.

Also, the fact that the ready salted and the salt and vinegar both have the same number of, the same grams of fat per hundred grams of crisps, even though the number of squares that were less left with a greasy mark are so different.

The ready salted was 166, whereas the salt and vinegar was 270.

So I think that's really, really interesting.

Let's just do a quick check-in of your learning and it says, which secondary source would it be useful to compare our results with? Would it be, A, the Eatwell plate, B, a food label, or C, a food triangle? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

The answer is B, a food label.

Okay, so task B.

Let's have a look at the first part of task B.

It says, discuss the results of your investigation.

Which of your crisps that you tested out produce the largest and smallest greasy marks? And I want you to compare your results with the nutritional information on crisp packets.

So you're going to have to use your results for this one now.

Now, if you didn't do the previous lesson, that's okay.

You may want to go back and have a go at carrying out the investigation and having a look at that lesson first before coming back and completing this.

So I'll give you some time now.

I'd like you to pause the video and have a go at doing this part of your task.

Off you go.

Fantastic.

Well done.

So let's have a look at what Lucas says.

Lucas says, "Most of our results match the food labels of the crisps we tested.

The salt and vinegar crisp, produced the largest greasy mark and also contains the most fat per hundred grams. However, the lentil crisp made the smallest greasy mark, but the food label show us that the popcorn crisps contain the least amount of fat per hundred grams." Now were your results similar to Lucas's or was your more accurate? Now I want you to evaluate your investigation and suggest improvements.

So is there anything that you would do differently to improve your investigation? So I'd like you to pause the video here and have a really good think about this question.

Off you go.

Fantastic.

Well done.

So Aisha says, "I wonder if our results are different to the food labels because some of the crisps were not very flat, so only a little bit of the crisp was touching the square paper.

I would improve the investigation by choosing the flattest crisps so that a similar amount of each crisp is touching the paper." Now, did you think of any different improvements? So you might have said things like you wanting to make sure that your crisps are of a similar size so that it's fair, because if your one of your crisp is much larger than the other ones that you're testing, then you're going to get a bigger area of greasy squared paper.

You may have also had other improvements as well.

You may have decided, actually, you'd quite like to try the same brand of crisp, but in different flavors and see whether or not that would work too.

Lucas says, "The food labels give us information for a hundred grams of each crisp.

I wonder if our results are different to the food labels because we didn't weigh them.

To improve this investigation, I would make sure each crisp had the same mass." So not just the same size, but the same mass as well.

So now we are on to the summary of our learning today.

Fats in food absorbed by paper make a greasy mark.

The size of greasy marks from food on paper can be measured and compared.

Scientists write conclusions to explain their results.

Scientists can evaluate completed investigations and suggest improvements.

The results of a scientific investigation can be compared to secondary sources.

And remember, Lucas and Aisha were looking at the nutritional information on the packs as well.

So well done.

You have worked really, really hard today.

Fantastic effort and brilliant conclusions and reviewing of your work and your suggested improvements as well.

Well done.