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Differences between the nutritional display in grams and percentages

Solution We get a few questions about the differences between the display of the nutritional data in grams and the display in percentages so thought we would add this to the knowledge base as it may help explain matters.

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An example question
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The calculation of the breakdown of the nutritional profile and the target nutritional profile are not in line with the information in grams. How are these percentages calculated?



These are the numbers in the target nutritional profile (and the percentages when one toggles):

 Carbs: 290.1g / 60% 
Protein: 48.4g / 10%
, Fat 64.5g/ 30% 


290.1/(290.1+48.4+64.5) = 72% and 

not 60% as displayed, what is wrong?

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The answer to this question
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What is happening is when the software displays the grams it shows how many grams you have consumed (as you would expect).

When you swap to the percentages,  the software displays the 'percentage of calories consumed' from fat and protein, carbs.   As there are approximately 4 calories in a gram of protein or carbs,  but 9 calories in a gram of fat the charts will change accordingly and the amount of fat consumed will show as a larger percentage as there are more calories consumed from fat.

In this example,

290g carbs x 4 calories per gram = 1160 calories from carbs,
48g protein x 4 calories per gram = 192 calories from protein,
64g fat x 9 calories per gram = 576 calories from fat.

1160 + 192 + 576 = 1928 approx. total calories (the software will work this out exactly).

(1160 / 1928) * 100 = 60 % from carbs
(192 / 1928) * 100 = 10% from protein
(576 / 1928) * 100 = 30% from fats

Most government guidelines are to display the percentages as calories consumed as their guidelines work this way,  for example and depending on which country you are in at the time package labelling may state 30 or 35% of your recommended diet should come from fats,  but this is not 35 of grams of fat per 100 grams of food (ie. 35% of grams consumed), it is 35% of the calories consumed.

We are afraid it can appear a little confusing and be difficult to explain,  we added the option to show either percentages of calories consumed or grams consumed so you can choose how you want to track the data depending on the diet you have selected,  and the grams figure can be useful when looking to see how many more grams you have left in a day,  but the best indicator of your true nutritional profile is actually the percentages graph.
 
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Article details
Article ID: 6
Category: Knowledgebase
Date added: 2010-12-16 18:32:23
Views: 1072
Rating (Votes): Article rated 2.5/5.0 (34)

 
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