0:00:02 > 0:00:05OK, gastronuts. Let's find out what our task is this week.
0:00:09 > 0:00:14Can good foods be bad and bad foods be good?
0:00:36 > 0:00:39The gastronuts joining me on this week's show are...
0:00:50 > 0:00:54I wish that Brussels sprouts and beetroot were unhealthy.
0:00:54 > 0:00:57I like unhealthy foods because they've got more of a taste,
0:00:57 > 0:01:00they have salt, sugar, sweet and sour so it's really nicer
0:01:00 > 0:01:03than healthy foods, as they haven't got a taste to it.
0:01:03 > 0:01:07I wish all unhealthy food was good for me.
0:01:07 > 0:01:10I wish crisps were healthy, so I could have lots of them.
0:01:10 > 0:01:12Coming up, on today's show,
0:01:12 > 0:01:17the gastronuts find out just how flammable their favourite cereal is.
0:01:17 > 0:01:21They discover what happens if you lunch too much on lard.
0:01:23 > 0:01:28They race in a granny Grand Prix to get a gobble of a piece of gateau.
0:01:30 > 0:01:34But first of all, we look at the murky world of which foods
0:01:34 > 0:01:36can and can't be called healthy.
0:01:36 > 0:01:39What is it in food that we are told is unhealthy?
0:01:39 > 0:01:41- What do we eat too much of?- Fat.
0:01:41 > 0:01:43- Fat. Anything else?- Sugar.
0:01:43 > 0:01:46Sugar. You've got to watch out for how much sugar you eat.
0:01:46 > 0:01:49So, which of the foods we enjoy have too much sugar and fat in them?
0:01:49 > 0:01:51- Chocolate.- Yeah, chips.
0:01:51 > 0:01:53Burgers. Yeah.
0:01:53 > 0:01:55Are these the foods that we really love?
0:01:55 > 0:01:58- Yeah.- Yeah, they're good stuff.
0:01:58 > 0:02:01I want to try and work out why we love those foods so much. OK?
0:02:01 > 0:02:05I want to see also if we can tell how much fat and sugar is in them.
0:02:05 > 0:02:08- OK. Are you up for this?- Yeah.
0:02:08 > 0:02:10Having a proper breakfast is important. Many people think
0:02:10 > 0:02:14of cereal as being a healthy choice, but some cereals contain surprising
0:02:14 > 0:02:18amounts of sugar, which makes them less healthy than you first think.
0:02:18 > 0:02:22Here we are in the magical world of cereal.
0:02:22 > 0:02:23How much in this country
0:02:23 > 0:02:26do you reckon we spend on cereal every year?
0:02:26 > 0:02:28£2 million?
0:02:28 > 0:02:30£3 million?
0:02:30 > 0:02:33£6 million?
0:02:33 > 0:02:36Come on, guys, get up higher, what's bigger than £6 million?
0:02:36 > 0:02:38£11 million.
0:02:38 > 0:02:42Shall I tell you how much? We spend £1 billion on cereal every year.
0:02:42 > 0:02:46It's almost £1.5 billion.
0:02:46 > 0:02:50That's enough cereal to fill up Buckingham Palace twice over.
0:02:50 > 0:02:55Some people think that cereals have too much sugar inside of them.
0:02:55 > 0:02:57What we're going to do is try to work it out.
0:02:57 > 0:03:00See if there are some surprises lurking in these boxes.
0:03:00 > 0:03:02We're going to sort the cereals into three types -
0:03:02 > 0:03:05Low sugar, less than five grams per 100 grams.
0:03:05 > 0:03:10Medium sugar, between 5 and 15 grams per 100 grams
0:03:10 > 0:03:13and high sugar, which is over 15 grams of sugar
0:03:13 > 0:03:14in every 100 grams of cereal.
0:03:14 > 0:03:17So, we have everything laid out here. What is the
0:03:17 > 0:03:21first thing you notice about the three different groups you have got?
0:03:21 > 0:03:25The high sugars are aimed at kids, because they have lots of cartoons
0:03:25 > 0:03:27or they might sell toys?
0:03:27 > 0:03:30They're eye-catching.
0:03:30 > 0:03:33There's less on the low sugar ones and not that much on medium,
0:03:33 > 0:03:36- but a lot of high ones.- Exactly.
0:03:36 > 0:03:39There are masses of high sugar cereals and only how many low sugar?
0:03:39 > 0:03:44- Three.- Three! I would have thought it would have been more split.
0:03:44 > 0:03:47Let's have a look at thee at the low sugar ones first of all.
0:03:47 > 0:03:49Do you eat these kind of things?
0:03:49 > 0:03:52- Some of you?- Sometimes. - You're not very keen.
0:03:52 > 0:03:55What would you do once you put them in the bowl, you add some milk,
0:03:55 > 0:03:58- would you add anything else to it? - Sugar.- Sugar.- Fruit.
0:03:58 > 0:04:01The thing about adding all those sugars to a cereal,
0:04:01 > 0:04:03you know what you are adding.
0:04:03 > 0:04:06Some of these other ones seem to have it hidden away.
0:04:06 > 0:04:09Let's take a look at the medium sugar ones.
0:04:09 > 0:04:12When we look at these on the table,
0:04:12 > 0:04:14do you think that is a sugary snack?
0:04:14 > 0:04:15Or do you think it's healthy?
0:04:15 > 0:04:18I'm looking at Corn Flakes, what do you reckon,
0:04:18 > 0:04:19- is that a healthy breakfast? - Healthy.
0:04:19 > 0:04:21It is pretty healthy, isn't it?
0:04:21 > 0:04:25- Did you think there was added sugar in Corn Flakes?- No.- It is weird.
0:04:25 > 0:04:27Where have they put the sugar in there?
0:04:27 > 0:04:29They are flakes of corn, aren't they?
0:04:29 > 0:04:31The amount of sugar in some of the cereals here
0:04:31 > 0:04:34is equivalent to the amount of sugar
0:04:34 > 0:04:38- in these...- Wow!
0:04:38 > 0:04:40Iced buns! Who likes an iced bun?
0:04:40 > 0:04:43- Me!- Does that surprise you?
0:04:43 > 0:04:48Yeah. When you think of an iced bun, you think lots of sugar.
0:04:48 > 0:04:50It's a naughty trick. That's something that you have
0:04:50 > 0:04:53at the end of the day if you've been really good , it's a treat.
0:04:53 > 0:04:56I think we ought to have a treat. You've been good.
0:04:56 > 0:04:59- I shouldn't be having these. - They feel quite naughty, don't they?
0:04:59 > 0:05:02- Yeah.- OK, gastronuts, we are here with the big fellas,
0:05:02 > 0:05:04these are the high sugar cereals.
0:05:04 > 0:05:07They've got 15 grams or more per 100 grams of sugar.
0:05:07 > 0:05:10Who do you think all of these cereals are aimed at?
0:05:10 > 0:05:13- Children.- They are aimed at cool kids, aren't they?
0:05:13 > 0:05:17- Tell me about the packaging and what you can see here.- The cartoons.
0:05:17 > 0:05:21- Big, bold writing.- They're quite attractive things, aren't they?
0:05:21 > 0:05:28Do you think it's a bit naughty using those cartoons, free offers
0:05:28 > 0:05:31and toys? Why is it naughty, do you think?
0:05:31 > 0:05:35Because they want you to buy their things.
0:05:35 > 0:05:37They want you to spend your money on their product.
0:05:37 > 0:05:40Let's have a look at another food
0:05:40 > 0:05:43that is as sugary as these ones here, these three cereals.
0:05:43 > 0:05:47Amazingly, these are as sugary as...
0:05:47 > 0:05:49- Wow!- What is that?
0:05:49 > 0:05:53- Shortbread biscuits.- Shortbread biscuits, covered with sugar!
0:05:53 > 0:05:55But is that the sort of thing you would normally have
0:05:55 > 0:05:57- for breakfast on its own?- No.
0:05:57 > 0:05:58It's surprising, isn't it?
0:05:58 > 0:06:03Incredibly, some cereals are even more sugary than shortbread.
0:06:03 > 0:06:05Let's have a look at the big guys.
0:06:05 > 0:06:10These are the highest sugar cereals in our bunch.
0:06:10 > 0:06:16Some of these have as much sugar in as these...
0:06:16 > 0:06:19Wow!
0:06:19 > 0:06:20What have we got here?
0:06:20 > 0:06:23Jammy Dodgers, Bourbon and chocolate digestives.
0:06:23 > 0:06:25What would you think if you had a breakfast of these?
0:06:25 > 0:06:27They wouldn't allow me to have that.
0:06:27 > 0:06:29- Why not?- Because they're too sugary.
0:06:29 > 0:06:33So, what we need is a visual way of showing how much sugar is in
0:06:33 > 0:06:36all of these different cereals. We've got the low sugar cereal.
0:06:36 > 0:06:40The medium sugar cereal and the high sugar cereal.
0:06:40 > 0:06:43Luckily, we have a scientist. Our chemist, Rosie.
0:06:43 > 0:06:48She's got a brilliant way of showing in a very short amount of time,
0:06:48 > 0:06:52how much energy is packed by these different cereals,
0:06:52 > 0:06:54but we will need some of these.
0:06:54 > 0:06:56OK.
0:06:56 > 0:06:58Pop those on.
0:06:58 > 0:07:00Rosie is going to burn our cereals
0:07:00 > 0:07:05by adding a chemical to each of them, followed by a splash of milk.
0:07:05 > 0:07:08Sugar contains a lot of energy which burns quickly.
0:07:08 > 0:07:12So the more sugar in the cereal, the greater the flame given off.
0:07:12 > 0:07:15The low sugar cereal will release its energy more slowly
0:07:15 > 0:07:20and won't burn as intensely, that's the one we are starting with.
0:07:20 > 0:07:23- Oh.- It's burning. - Anything exciting there?
0:07:23 > 0:07:26Like a little puff of smoke.
0:07:26 > 0:07:29I think that would show there is not very much energy.
0:07:29 > 0:07:32Next up, the medium sugar cereal.
0:07:32 > 0:07:34Ready, guys.
0:07:34 > 0:07:37Oh! blimey!
0:07:40 > 0:07:43- Oh, my God.- Wow!
0:07:43 > 0:07:46I think that would show it's quite high in sugar.
0:07:46 > 0:07:48Finally, it's the high sugar cereal.
0:07:48 > 0:07:50Just how brightly will this one burn?
0:07:50 > 0:07:555, 4, 3, 2, 1, milk it!
0:07:59 > 0:08:02Oh, my days!
0:08:02 > 0:08:03Wow!
0:08:05 > 0:08:11That surprised me, you wouldn't think cereal had that amount of energy.
0:08:11 > 0:08:13I was amazed at how much energy was
0:08:13 > 0:08:17burnt out of a bowl of cereal, it was just shocking, really.
0:08:17 > 0:08:20At breakfast time, it is easier to eat much, much
0:08:20 > 0:08:22more sugar than you expected to.
0:08:22 > 0:08:25Now, when it comes to lunch, it's easy to eat too much fat.
0:08:25 > 0:08:28So, we're going to play a little game, to see if we can work out
0:08:28 > 0:08:30which foods have the most fat in them.
0:08:30 > 0:08:36Yes, it's time to play Fat or Low Fat!
0:08:36 > 0:08:39Contestant number one is Natasha.
0:08:39 > 0:08:43She likes playing football and hates raw onions.
0:08:43 > 0:08:47Here, we have two very fine meals.
0:08:47 > 0:08:49The hamburger and fries.
0:08:49 > 0:08:52Over here, we have chicken and rocket sandwich.
0:08:52 > 0:08:56So that is chicken in the middle there, a bit of mayonnaise,
0:08:56 > 0:08:58you need to choose the less fatty of the meals.
0:08:58 > 0:09:02Which one will Natasha choose? Can she spot the lowest-fat meal
0:09:02 > 0:09:04and become a legend in her own lunch hour?
0:09:04 > 0:09:07You reckon that one there, a nice, succulent sandwich. You would choose
0:09:07 > 0:09:09that as probably the healthy option?
0:09:09 > 0:09:13- Yep.- Well, the one that you didn't choose, the hamburger
0:09:13 > 0:09:15has quite a lot of fat in.
0:09:17 > 0:09:19That is a big old lump of lard.
0:09:19 > 0:09:22That is 19 grams of fat.
0:09:25 > 0:09:28Now, then, the chicken and rocket sandwich.
0:09:30 > 0:09:33It's got more fat in than the hamburger and fries.
0:09:33 > 0:09:36What are the ingredients in there?
0:09:36 > 0:09:38You have salad and what else, there?
0:09:38 > 0:09:42- Some chicken. - What is under the chicken?
0:09:42 > 0:09:44- Mayonnaise. - It's got mayonnaise in it.
0:09:44 > 0:09:46Well done.
0:09:46 > 0:09:50The chicken sandwich is higher in fat than the burger,
0:09:50 > 0:09:52so Natasha has failed.
0:09:52 > 0:09:54Contestant number two is OJ.
0:09:54 > 0:09:56He's crazy about computers
0:09:56 > 0:10:00and likes cracking his knuckles, but, will he be able to tell which
0:10:00 > 0:10:06of the chicken Caesar salad or the Margarita pizza is fat or low-fat.
0:10:06 > 0:10:08Probably this one.
0:10:08 > 0:10:10The salad.
0:10:10 > 0:10:12A decisive choice, but is it right?
0:10:12 > 0:10:14Over to you, Stefan.
0:10:14 > 0:10:17Well, the Margarita pizza has...
0:10:17 > 0:10:1923 grams of fat.
0:10:19 > 0:10:21You're eating that much fat when you have pizza.
0:10:21 > 0:10:24Quite greasy, quite a lot of fat.
0:10:26 > 0:10:28Your chicken Caesar salad
0:10:28 > 0:10:31with the mayonnaise and croutons and everything...
0:10:34 > 0:10:3530 grams of fat!
0:10:35 > 0:10:39What are the ingredients in that salad?
0:10:40 > 0:10:43Mayonnaise, chicken, salad.
0:10:43 > 0:10:45So, you got mayonnaise there.
0:10:45 > 0:10:46OK. Well done.
0:10:46 > 0:10:50So, OJ also fails as the pizza actually has
0:10:50 > 0:10:52less fat than the Caesar salad.
0:10:55 > 0:10:59Contestant number three is Danielle.
0:10:59 > 0:11:02She loves dancing and hates her dad's cooking,
0:11:02 > 0:11:06but can she tell which out of the pasta salad, our the jacket potato
0:11:06 > 0:11:11- with butter and coleslaw is fat or low-fat?- The salad?
0:11:11 > 0:11:13The salad. Why have you chosen that?
0:11:13 > 0:11:15Because it's got cheese in it.
0:11:15 > 0:11:18- It's got cheese, what else? - Mayonnaise.
0:11:18 > 0:11:22The jacket potato has 25 grams of fat.
0:11:22 > 0:11:25- Would you eat that, knowingly?- No. - It's a bit disgusting, isn't it?
0:11:25 > 0:11:27- Yeah.- It's crunch time for Danielle.
0:11:27 > 0:11:31- Has she chosen correctly?- Well, let's look at your healthy pasta salad,
0:11:31 > 0:11:33the pasta salad has...
0:11:33 > 0:11:3728 grams of fat in.
0:11:37 > 0:11:40Are you surprised that the pasta salad has more fat in it
0:11:40 > 0:11:44- than the baked potato? - Yes, and kind of no,
0:11:44 > 0:11:47because that's got more mayonnaise and cheese.
0:11:47 > 0:11:50Good effort, you got it wrong, though, never mind.
0:11:50 > 0:11:53Once again our contestant has failed,
0:11:53 > 0:11:57as the jacket potato contains less fat than the cheese salad.
0:12:00 > 0:12:05Our last contestant to try and outfox the fat is Jake.
0:12:05 > 0:12:08Jake likes playing hockey and hates Brussels sprouts.
0:12:08 > 0:12:12His choices are a tuna and sweetcorn sandwich and fish and chips.
0:12:12 > 0:12:16Time for him to play Fat or Low Fat!
0:12:16 > 0:12:19- Fish and chips.- OK.
0:12:19 > 0:12:20How is the fish cooked?
0:12:20 > 0:12:24It's fried and dipped in batter.
0:12:24 > 0:12:26At this point I will give you the option,
0:12:26 > 0:12:30would you like to change your decision?
0:12:30 > 0:12:34It's an agonising decision, the crowd are no help.
0:12:34 > 0:12:37Yeah, the fish and chips have less fat.
0:12:37 > 0:12:41Less fat, the fish and chips have less fat. So, why do you think
0:12:41 > 0:12:43that the tuna and sweetcorn sandwich has more fat in it?
0:12:43 > 0:12:46Well, because it is not just tuna and sweetcorn.
0:12:46 > 0:12:51- What else goes into that to mix it together?- Mayonnaise.
0:12:51 > 0:12:54You said that the fish and chips had the lowest amount of fat.
0:12:54 > 0:12:58Let's look at the tuna and sweetcorn sandwich.
0:12:58 > 0:13:02The tuna and sweetcorn sandwich has 39 grams of fat in it.
0:13:07 > 0:13:08The fish and chips has...
0:13:11 > 0:13:1318 grams of fat.
0:13:13 > 0:13:15So, you got it spot on. Well done my friend.
0:13:15 > 0:13:18That is all from Fat or Low Fat.
0:13:18 > 0:13:20See you next time!
0:13:20 > 0:13:24So, many of the lunchtime favourites we think are the healthier options
0:13:24 > 0:13:26are dripping in hidden fat.
0:13:26 > 0:13:29It is all down to one very common ingredient...
0:13:29 > 0:13:32- Mayonnaise.- Mayonnaise.
0:13:32 > 0:13:33- Mayonnaise.- Mayonnaise.
0:13:37 > 0:13:39- So, what's in mayonnaise?- Eggs.
0:13:39 > 0:13:41Eggs, then you add a little bit
0:13:41 > 0:13:45of mustard, so, Danielle, pop a tea spoon of mustard in there.
0:13:45 > 0:13:48Slop it in, lovely.
0:13:48 > 0:13:50Spoon at the ready, OJ,
0:13:50 > 0:13:56the other ingredient in mayonnaise is a little bit of fat.
0:13:56 > 0:13:58This is olive oil going into this.
0:13:58 > 0:14:00There are lots of different types of fat going into mayo,
0:14:00 > 0:14:02but this one is olive oil.
0:14:02 > 0:14:04Just keep going, nice and slowly.
0:14:04 > 0:14:09Why do you reckon that there is so much of it in our food?
0:14:09 > 0:14:12Maybe because it tastes better.
0:14:12 > 0:14:15It tastes better, doesn't it? So, we have oil going in here,
0:14:15 > 0:14:20and a little more oil. It's got more oil in it,
0:14:20 > 0:14:23and it's got more oil in it. That's what goes into mayonnaise.
0:14:23 > 0:14:27A very, very small amount of egg yolk
0:14:27 > 0:14:29and a lot of fat!
0:14:29 > 0:14:32But you're doing a really good job there, OJ. You crack on,
0:14:32 > 0:14:35we'll go and do something more interesting, come on, guys.
0:14:38 > 0:14:42Like with sugar, we only need to eat a small amount of fat.
0:14:42 > 0:14:45If we eat too much, it's very easy to put on weight
0:14:45 > 0:14:49and end up looking like this.
0:14:49 > 0:14:52- How does it feel, guys?- Good!- Good?!
0:14:52 > 0:14:54- Weird!- Weird?
0:14:55 > 0:14:59So, so, 24% of people in the UK are obese.
0:14:59 > 0:15:03That means that they're really very overweight.
0:15:03 > 0:15:07Now, if you ate the right amount of calories each day,
0:15:07 > 0:15:09then had this extra amount,
0:15:09 > 0:15:14which is two-and-a-half teaspoons of mayonnaise every day,
0:15:14 > 0:15:17over a week, you would put on a quarter of a kilo.
0:15:17 > 0:15:20If you kept eating at that rate, by my age,
0:15:20 > 0:15:24you would all end up weighing 349 kilos!
0:15:24 > 0:15:28Yeah. That's big, isn't it? It's also very inconvenient.
0:15:28 > 0:15:31Being hugely overweight, can be very
0:15:31 > 0:15:34awkward, especially when you want to...
0:15:34 > 0:15:36tie your hair back,
0:15:36 > 0:15:38walk upstairs
0:15:38 > 0:15:40and get into a phone box...
0:15:43 > 0:15:47But there is one thing being this enormous can make you good at,
0:15:47 > 0:15:50the tug of war!
0:16:03 > 0:16:05THEY CHEER
0:16:14 > 0:16:18But there are ways to have lovely lunches without losing the taste.
0:16:18 > 0:16:22We're hooking up with someone who uses a delicious alternative
0:16:22 > 0:16:26to mayonnaise, which won't transform us into tubbies.
0:16:26 > 0:16:29Gastronuts, Benny. Benny, gastronuts.
0:16:29 > 0:16:32- Hello, Benny.- Hello.- Now, all of the great-tasting lunches
0:16:32 > 0:16:35we tried had loads of mayonnaise in. Can you make something
0:16:35 > 0:16:38that tastes great, but doesn't have anyway mayonnaise in?
0:16:38 > 0:16:40I think we can. We do a chicken wrap.
0:16:40 > 0:16:43Instead of using mayonnaise we use yoghurt instead.
0:16:43 > 0:16:44So, we've got flat bread.
0:16:44 > 0:16:48The first thing we do is take the aioli, which is mayonnaise without
0:16:48 > 0:16:54the oil, which is made from yoghurt, garlic, there's some egg in there.
0:16:54 > 0:16:56Each gastronut gets their own piece of flat bread
0:16:56 > 0:16:59and some of Benny's mayo substitute.
0:16:59 > 0:17:03Next, they tear up fresh lettuce and add lemon juice.
0:17:03 > 0:17:06Squeeze it really hard. I will put my hands there
0:17:06 > 0:17:07so it doesn't get in any pips.
0:17:07 > 0:17:10They won't be very nice to eat. That's it, squeeze.
0:17:10 > 0:17:13The salad gets a good shaking.
0:17:13 > 0:17:16Get in there, right to the bottom!
0:17:16 > 0:17:20- You want a small handful. - Next, the chicken.
0:17:20 > 0:17:23Marinated and char-grilled rather than fried,
0:17:23 > 0:17:25which lets more of the fat drip away.
0:17:25 > 0:17:27This is where we put the mint on.
0:17:27 > 0:17:29It's fresh mint I have picked and washed.
0:17:29 > 0:17:32Don't you think mint and chicken doesn't go together?
0:17:32 > 0:17:35That's what I thought when I was first thinking about
0:17:35 > 0:17:37what are we going to put in this wrap.
0:17:37 > 0:17:39But when you taste it, it gives it a fresh explosion.
0:17:39 > 0:17:42After the mint they add chopped tomatoes,
0:17:42 > 0:17:44and then it's time to get wrapping.
0:17:44 > 0:17:47- How do they look? - Very nice.- Very tasty.
0:17:47 > 0:17:49Well, the proof is in the pudding.
0:17:49 > 0:17:51- Give it a go.- Tuck in.
0:17:52 > 0:17:55You can really taste the mint in it.
0:17:55 > 0:17:58What do you think about the yoghurt, though, is it good enough?
0:17:58 > 0:18:02Yeah, I think that is better than mayonnaise.
0:18:02 > 0:18:05- It tastes lot better and it's healthier for you.- So, that's food,
0:18:05 > 0:18:08made with only a little bit of fat, but it still tastes great.
0:18:08 > 0:18:10Thanks, Benny.
0:18:10 > 0:18:12- Thanks, Benny.- It's been a pleasure.
0:18:16 > 0:18:19We're trying to find out if good foods can be bad and if bad foods
0:18:19 > 0:18:25can be good. So far, the gastronuts have burnt their breakfast
0:18:25 > 0:18:29and played a game where they guess how much lard is in their lunch.
0:18:29 > 0:18:34Later on, they compete in the world's slowest race, but first...
0:18:42 > 0:18:46Can we move food without actually touching it?
0:18:46 > 0:18:48Let me show you.
0:18:48 > 0:18:54We're going to take a little bit of cereal and put it into our milk.
0:18:54 > 0:18:56Something we do every morning at breakfast.
0:18:56 > 0:19:00Now, watch. The cereal moves.
0:19:04 > 0:19:06Is this magic?
0:19:06 > 0:19:08Well, no, actually.
0:19:11 > 0:19:14All it is is magnetism.
0:19:14 > 0:19:18What we have here is a good example of magnetic food.
0:19:18 > 0:19:19There is a little bit of iron that's
0:19:19 > 0:19:23added to our cereal to make it a little more nutritious.
0:19:23 > 0:19:28As a result, the cereals actually attract,
0:19:28 > 0:19:30but we can also repel food with a magnet.
0:19:30 > 0:19:33Have a look at these strawberries.
0:19:33 > 0:19:37I'm going to bring the magnet up very close and watch.
0:19:37 > 0:19:42Almost magically, the strawberry starts to run away.
0:19:42 > 0:19:45Why do these effects happen?
0:19:45 > 0:19:49It's all down to electrons.
0:19:49 > 0:19:52Electrons are inside all of the foods that we eat.
0:19:52 > 0:19:55If they are arranged one way, as in iron, our cereal is attracted.
0:19:55 > 0:19:57If, on the other hand,
0:19:57 > 0:20:02they are arranged in a different way, as in strawberries, it's repelled.
0:20:02 > 0:20:05Magnetic food, who would have thought?
0:20:08 > 0:20:10OK, gastronuts. I would like you it meet Stephanie.
0:20:10 > 0:20:12Hi, gastronuts.
0:20:12 > 0:20:15Now, Stephanie is a brilliant nutritionist. She knows all about
0:20:15 > 0:20:17why we love food so much and what it does to our body.
0:20:17 > 0:20:21So do our bodies actually need fat and sugar, or are they just a treat?
0:20:21 > 0:20:23We definitely need fat and sugar,
0:20:23 > 0:20:25that's why our bodies love it so much,
0:20:25 > 0:20:29they are asking for it every day. We need it for energy and to be healthy.
0:20:29 > 0:20:32This goes back to the days when our ancestors were living in caves,
0:20:32 > 0:20:34many, many thousands of years ago,
0:20:34 > 0:20:38they were naturally programmed to go out and find sweet foods
0:20:38 > 0:20:42and fatty foods as they needed them to be able to have the energy to hunt
0:20:42 > 0:20:45their food, stay warm in the winter and to be healthy.
0:20:45 > 0:20:47What did our ancestors eat?
0:20:47 > 0:20:50Two kinds of things.
0:20:50 > 0:20:53Firstly the meat that they would hunt and kill.
0:20:53 > 0:20:56They would eat all of the meat and all the fat.
0:20:56 > 0:21:00To supplement the diet they would find things like this plate here.
0:21:00 > 0:21:03We can see natural fruits.
0:21:03 > 0:21:06Wild fruits and berries.
0:21:06 > 0:21:09Nuts and seeds growing wild in the undergrowth.
0:21:09 > 0:21:13They would have been fishing if they lived near to the sea
0:21:13 > 0:21:15and digging in the ground, looking for roots
0:21:15 > 0:21:18and tubors which were sweet vegetables,
0:21:18 > 0:21:21giving them the energy that they needed to hunt every day.
0:21:21 > 0:21:23Combined that was a healthy diet.
0:21:23 > 0:21:25So, our ancestors did lots of hunting.
0:21:25 > 0:21:27What did they catch, what was the food they were after?
0:21:27 > 0:21:30Probably any wild animal.
0:21:30 > 0:21:34The animals that the cavemen were eating had actually a low fat content
0:21:34 > 0:21:37compared to the meat we see in our supermarkets today.
0:21:37 > 0:21:40Domesticated animals farmed today don't get to run around in the wild
0:21:40 > 0:21:45like those animals did, they are fed much more concentrated foods,
0:21:45 > 0:21:49so they build up body fats more than the wild animals would have.
0:21:49 > 0:21:51So, what is the big difference between the two pieces of meat?
0:21:51 > 0:21:55- You can see the fat more. - You can see the fat there.
0:21:55 > 0:21:57This is venison, a wild meat.
0:21:57 > 0:22:00It's not kept in a small space.
0:22:00 > 0:22:03This is from pork, a much less active animal.
0:22:03 > 0:22:05It grows a big,
0:22:05 > 0:22:10big layer of fat on the side of it, but that is almost pure meat.
0:22:10 > 0:22:11Have a feel of that.
0:22:11 > 0:22:15The reason it's so much darker is the muscle is denser.
0:22:15 > 0:22:17It has to use the muscles much more.
0:22:17 > 0:22:19So, if we're eating much more fat like this now,
0:22:19 > 0:22:22does that mean that our bodies are different
0:22:22 > 0:22:24from that of our old ancestors?
0:22:24 > 0:22:26We're carrying more body fat as a human race now.
0:22:26 > 0:22:30Our ancestors were very, very active. They were burning off the fat
0:22:30 > 0:22:33that they were eating. Whereas today we are not going out hunting,
0:22:33 > 0:22:37are we, we are just popping down to the supermarket, so we don't need to
0:22:37 > 0:22:40use up as much energy as they did.
0:22:40 > 0:22:42- Stefan, just lift off that lid for me.- OK.
0:22:42 > 0:22:45Now, that is pure, solid fat.
0:22:45 > 0:22:51That's about how much extra fat is on a human male these days compared to
0:22:51 > 0:22:55how much would have been on our forefathers, the cavemen.
0:22:55 > 0:22:58We're carrying that much more fat?
0:22:58 > 0:23:00- Yep.- Can you hold that?
0:23:00 > 0:23:03It's a bit of a tricky one, isn't it? Are you OK there?
0:23:03 > 0:23:04Can you feel how heavy that is?
0:23:04 > 0:23:07- Really heavy. - That's really heavy, isn't it?
0:23:07 > 0:23:10That's an extra five kilos of fat you've just strapped to yourself.
0:23:10 > 0:23:12You have to remember that the cavemen
0:23:12 > 0:23:15would have eaten the meat and fat when they had it,
0:23:15 > 0:23:18but there could have been days, weeks or months
0:23:18 > 0:23:20when they had no real food to eat.
0:23:20 > 0:23:22So what was stored in the fat cells
0:23:22 > 0:23:24would keep them going for a long time.
0:23:24 > 0:23:27Nowadays we can get hold of a pizza or bar of chocolate whenever we want.
0:23:27 > 0:23:31So we don't have to store all that energy in case the food runs out.
0:23:31 > 0:23:34Our bodies don't realise that, though. So our bodies are still
0:23:34 > 0:23:38storing fat whenever it can in case our food runs out.
0:23:38 > 0:23:41As long as you are active and burning up the food you are eating,
0:23:41 > 0:23:43you can eat fat no problem at all.
0:23:43 > 0:23:47Your body needs it to be healthy, but it's about getting the balance right.
0:23:47 > 0:23:50Let's take a look at how long it takes to burn off the fat
0:23:50 > 0:23:54from our favourite food. Guys, follow me.
0:23:54 > 0:23:57- Do you like... cake? - Yeah!- Yeah, we all love cake.
0:23:57 > 0:24:00- Who wants a piece of cake?- Me!
0:24:00 > 0:24:02Not so fast.
0:24:02 > 0:24:05Before you are allowed your fatty, sugary treat,
0:24:05 > 0:24:11you'll have to work off all of the energy in your favourite foods, OK?
0:24:11 > 0:24:17Jake, you are going to have to work off the energy inside...
0:24:17 > 0:24:19a steak!
0:24:19 > 0:24:22Steak and vegetables! Natasha, the energy that you have to work off
0:24:22 > 0:24:26is contained in a tagliatelle carbonara.
0:24:26 > 0:24:29Danielle, chicken burger and fries.
0:24:29 > 0:24:32OJ, you've got the big fella,
0:24:32 > 0:24:34the pizza!
0:24:34 > 0:24:36What we are going to do is a have race,
0:24:36 > 0:24:40you need to burn off the calories in your meal
0:24:40 > 0:24:43before you are allowed the fatty, sugary treat, OK?
0:24:43 > 0:24:48Wait here, I'm going to get your mighty steed for the race.
0:24:48 > 0:24:50Hold on.
0:24:50 > 0:24:51OK.
0:24:55 > 0:24:57MUSIC: Theme from "Steptoe and Son"
0:24:57 > 0:24:59- THEY LAUGH - Yes!
0:24:59 > 0:25:04This super duper four-wheeler scooter has an electric engine
0:25:04 > 0:25:07and can reach a maximum speed of four miles an hour.
0:25:07 > 0:25:10It's used by my neighbour,
0:25:10 > 0:25:13Mrs Miggins, to get to the front of the queue in the Post Office.
0:25:13 > 0:25:16Yes, gastronuts, your motors.
0:25:16 > 0:25:18Remember, the more energy in the meal you've got,
0:25:18 > 0:25:21the further you have to go to burn it off.
0:25:21 > 0:25:22Then it's cake time.
0:25:22 > 0:25:26This isn't going to be the fairest race in the world.
0:25:26 > 0:25:31The more fat and sugar in the meal, the longer it takes to burn off.
0:25:31 > 0:25:33Ready, set, go!
0:25:33 > 0:25:34MUSIC: "The Chain" by Fleetwood Mac
0:25:37 > 0:25:39MUSIC: Theme from "Steptoe and Son"
0:25:39 > 0:25:43Looking pretty good. Keep going, you've got a long way to go.
0:25:51 > 0:25:54Yeah! Park yourself up!
0:25:54 > 0:25:59Jake finishes first, as his stone age style meal of steak and veg
0:25:59 > 0:26:05contains very little fat and sugar and only 514 calories.
0:26:05 > 0:26:08The other gastronuts have a long way to go.
0:26:08 > 0:26:10Can I come in yet?
0:26:10 > 0:26:13No way, you've got a whole pizza to work off yet.
0:26:15 > 0:26:16Well done, Natasha.
0:26:16 > 0:26:19Natasha's finished after burning off
0:26:19 > 0:26:23946 calories in her tagliatelle carbonara.
0:26:25 > 0:26:29Still out on the track are Danielle and OJ.
0:26:29 > 0:26:32Danielle, you have finished.
0:26:32 > 0:26:37Danielle's finally finished after burning off
0:26:37 > 0:26:42the whopping 1,456 calories in her chicken burger and chips.
0:26:42 > 0:26:43- Can I come in yet?- No!
0:26:45 > 0:26:50There are a gut-busting 2,112 calories in OJ's pizza,
0:26:50 > 0:26:52about a day's worth.
0:26:52 > 0:26:55It may take him that long to burn them off!
0:26:57 > 0:27:00Working out which foods are good for us and which foods are bad
0:27:00 > 0:27:03can be tricky, but if we keep our wits about us,
0:27:03 > 0:27:05we can eat healthy food that is still really tasty.
0:27:05 > 0:27:08We can even enjoy some of our favourites treats now and then.
0:27:08 > 0:27:11That has got to be something worth celebrating.
0:27:11 > 0:27:13I enjoyed running around in the scooters.
0:27:13 > 0:27:18I found out how much fat you need to burn off and what you have to eat.
0:27:18 > 0:27:21I would not think mayonnaise was bad for you.
0:27:21 > 0:27:26No-one told me it was bad, but I've learned you shouldn't really eat it.
0:27:26 > 0:27:30I'll maybe ask my mum if I can look on the side of the packets
0:27:30 > 0:27:37and check how many calories it has got in that packet.
0:27:37 > 0:27:43I never knew that cereal could burn that much energy and that you could
0:27:43 > 0:27:46make a simple, easy dish healthy.
0:27:59 > 0:28:01Subtitles by Red Bee Media Ltd
0:28:01 > 0:28:03E-mail subtitling@bbc.co.uk