Food labels are a big help in making healthy food choices and following the reco
ID: 197202 • Letter: F
Question
Food labels are a big help in making healthy food choices and following the recommended daily values of certain nutrients. Clara, who is 17, heard about how calcium intake during teenage years is critical for achieving the optimal bone mass and preventing osteoporosis later in life. Because Clara’s grandmother and aunt have osteoporosis, Clara decided to check if she is consuming enough calcium. She found out the AI (Adequate Intake) for teenagers, which is 1,300 mg per day, and set out to calculate her daily intake. But what a surprise--the amount of calcium was nowhere to be found on food labels. There was only the % Daily Value.
Clara did some more reading and found out that the % Daily Value listed on food labels is for adults, not teenagers, and is based on a 2,000 kcal diet. In short, it is not for her. She will have to do some math to figure out her “numbers”.
Let’s help Clara calculate the amount of calcium in some foods and how much calcium she eats.
Part A - Calculating % DV of Calcium for Teenagers
Clara is a vegan and she does not drink milk, a food advertised as a best source of calcium. But she is not worried too much since she knows that leafy greens and legumes are excellent sources of this mineral.
What percentage of Clara’s daily calcium needs is in a cup of cooked collard greens? The food label says it is 27% DV.
In your calculations, use fractions (decimal equivalents, not the percentages); for example, for 25%, insert 0.25. For the final answer use a percentage and round the answer to the nearest whole number.
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Part B - Calculating % DV of Calcium in Foods
Almonds are another great source of calcium. One cup of almonds has 38% DV of calcium. What percentage of adolescent calcium needs would 1/2 cup of almonds fill for Clara?
In your calculations, use fractions (decimal equivalents, not the percentages); for example, for 25%, insert 0.25. For the final answer, use a percentage and round the answer to the nearest whole number.
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Explanation / Answer
Part A
In a cup of cooked collard greens, amount of calcium is 266 mg
The % DV for a nutrient is calculated by:
Since Clara's daily calcium need is 1300 mg per day,
so percentage of Clara’s daily calcium needs is in a cup of cooked collard greens= (266/1300)*100
is 20%
Part B
One cup of almonds(100 grams ) provide 378 mg or 38% DV of calcium.
Half cup will have 189 mg so percentage of Clara’s daily calcium needs is in half cup of almonds=
(189/1300)*100 = 14.53 = 15%