24 September 2018

Homework: The American Diet

this video I'm going to be talking about

the American diet and that was the Monday work that was due this past week so a lot of you had very specific problems with this but once you got going then you did a pretty good job so what I feel like is that you just need a couple of pieces of help and then you're all set so I'll let you read this we've got two circle graphs here and let's go ahead and read this part and read number one the circle graphs compare a typical American diet to a recommended diet so here's the typical American here's the recommended diet the graph show the percent of energy from different classes of nutrients so the different classes of nutrients are carbohydrates proteins saturated fats and unsaturated fats number one convert each of the percentages and the recommended diet that's this one of course above into calories assume 2,000 calories are needed per day so my hint multiplied the percentage times 2,000 total calories so let's go ahead and do this for being carbohydrates so if we have 2000 calories then we are multiplying that times 55% now as I mentioned in class you can't really multiply a by a percent

there are some calculators so that you do that but we have to think of a percent as a decimal and so what we do is we take that 55 that number 55 and we move that decimal place over one two times so we're going to take it out right there and we're going to move it over one two times so now we have zero point five five when we multiply two thousand times zero point five five then we get one thousand one hundred calories so that would be one thousand one hundred calories of carbohydrates I will let you do the remainder of number one but I wanted to show you how to do that part and it's getting all the way down so what kind of quick all right now this table is helpful for doing numbers 2 through 7 and so let's not look at the table right now let's just go straight to number 2 so that we know what we need to find number 2 says 1 gram of protein has about 4 calories so for every gram that's going to mean for calories calculate the total grams of protein let's start there so here we see protein in the table and this whole row has protein some of you missed the fact that there's not only 25 grams here but

there's also 6 grams over here for the fries so we have to add those two together so the total protein would be 25 plus 6 and that means 25.0 grams plus 6.0 grams equals 30 1.0 grams so that's how many grams of protein and then we need to calculate the number of calories from that protein and the hint as they multiply the total grams of protein times 4 calories per gram to get calories so what we're gonna do is we're gonna take that 30 1.0 grams now we're gonna multiply by 4 calories per gram and I'm going to abbreviate it 4 calories per gram like that so 31 times 4 is 124 calories and that is calories from protein number three one gram of carbohydrates I'm about four calories calculate the total number of calories from carbohydrates we have total carbohydrates right here but again it's this entire row all right so we need to add together the 4 to 5 grams the 63 grams and the 86 grams and then multiply by 4 just like we did for the proteins number four one gram of fat has about nine calculate the total number of calories from saturated unsaturated and saturated fats so we have saturated fats listed

down here but we do not have unsaturated fats instead we just have a total so you don't even need to add up unsaturated and saturated they're already added up for you in this total fat number but we still need to add up the number of fat the amount of fat from the burger and from the thighs so let's do that calculation real quick I'm gonna make this one go away so number four we've got up here twenty nine grams from the burger so twenty nine point zero grams plus we have 25 grams from the fries that equals 54 grams and then each gram of fat has nine calories so we're not gonna multiply by four we're gonna multiply it by nine this time that's nine calories per gram and let's see now doing this in my head so that's 400 and flips 486 calories from that's sum total minutes okay and again I'm gonna make that go away pause if you need to bye-bye then number five how many total calories are a fast food meal well there's a couple different ways you can do that you can do that the hard way which would be you know if you're hearing out how many calories you get from each one of those things or see on the bottom this great

little row right here add up the calories from the burger from the fries from the soda and then you get the total calories and fast food meal now some of you said well it's less than 2,000 calories understand this this 2,000 calories is for an entire day this burger fries and soda is one meal now if you eat three meals a day just imagine how many calories that would be per day I will let you do the calculation but I'm just gonna eyeball it and I'm looking at this as five hundred five hundred three hundred it's a little bit more than that but that's one thousand three hundred calories just from one meal if we multiply that by three that would be three thousand nine hundred calories which is almost twice what you're supposed to have in a day just just to give you a hint as to where you might want to go with that number six what portion of the daily requirements for total fat and total carbohydrates as a fast-food meal meat does this reflect a healthy diet again we need to look at how much of the total fat this meets forty-five percent of our total fat for the day is just coming from the burger 38 percent is coming from the fries well

I can add that up and I know that's a little over eighty percent is just coming from this one meal for fat so that tells you something about how healthy this diet is and then lastly I ask you to make a circle graph pie graph just like this showing the percentage of energy from carbohydrate unsaturated fat saturated fat and protein and the fast food meal described in the table you'll need to use your information from questions two through four so here's what you're going to need to do is you need to have your three amounts of calories need to have calories that you get from protein the calories that you get from carbohydrates and the calories that you get from fat and we're just going to shortcut it here I'm not going to separate this into a saturated unsaturated fat so if you remember we had a hundred and twenty-four calories from protein and don't quote me on this we had three four hundred and eighty six maybe calories from carbohydrates and [Music] from fats oh no that was fast so burner six calories from fat carbohydrates was quite a bit so it's

gonna be somewhere around 780 calories it's good that I'm not using the actual amount because then I'll know that I'll know if you just use my answer because my answer is not right but let's say it's about 780 and so what you're gonna do is you can add up these three numbers and that'll give you the total calories for the meal all right and this would be somewhere around let's say 1400 calories all right we know we already estimated that down here so if the total is 1400 calories we need to find out this is really where the math magic happens what percentage is 124 or 1400 well how we do that is we have to take that 124 calories divide it by the total 1400 calories and that will get us a decimal all right that decimal looks to be somewhere around I'm just gonna say 0.08 now remember we have to convert that to a percentage to get that to a percentage we need to use two decimal places so we're gonna do the reverse like we did before so we're going to take that decimal point and we're going to move it over two places so instead of it being 0.08 we're going to move that decimal place over and it's going to become 8 so that'll be

somewhere around 8 percent all right and then the carbohydrates do the same thing 780 over 1400 and I know 7 out of 14 is about 1/2 and so I'm just gonna ask mate if I see 50% then I know you were just using my answers don't use my answers do it on your own so that 0.5 0 is the decimal that you'll get in the calculator move the decimal place over twice and you get 50% and then the fat would be the rest in this case that would be about 42% and that's pretty close to where where it actually is and then you make a circle graph with the percentages all right you have to get to the percentage percentages first in order to make that circle graph right