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JDELI10533 SparkPoints: (246,127)
Fitness Minutes: (240,926)
Posts: 455
5/14/14 10:32 A

Thanks NIRERIN for helping me with the math and RUSSELL_40 for pointing out other possible sources of error. Now I just have to buckle down and pay attention to what I'm eating :)

RUSSELL_40 Posts: 16,826
5/14/14 10:17 A

Also manufacturer errors and members inputting labels wrong:

Fiber One cereal has 80 calories a serving, with 25 grams of carbohydrates for example. That's impossible, since 25 grams of carbs is roughly 100 calories. A 1/2 cup serving entered by a member was 60 calories, but still 25 grams of carbs.

Most often it is the reverse.. not enough carbs/protein/fat to add up to calories in a serving, The Fiber One is either probably more than 100 calories, or less than 20 grams of carbs, but since a lot of what we input, is from SP, who just enters manufacturers nutrition labels, or other members, who may hit a wrong key, there will be some errors.

We have ranges though for this reason. Whether it is 5 extra carbs, or 20 extra calories, you can still get it into the range. So 50 % carbs may be 45 %-55 %, so don't worry about hitting 50 % on the nose. A range allows for these small variances.

NIRERIN Posts: 14,297
5/14/14 9:26 A

it's a rounding error. if you do the math by hand for all of it you get 30% fat, 35% protein and 43% carbs, which as you'll note is more than 100%. rounding on the grams can get you about 2% either way depending on if we're talking .4 or .5. if you used the full info that's programmed in to spark and tried to round at the same places [enter in a single ingredient, and do all the math, repeat with everything you eat], you could get the 39%.

Edited by: NIRERIN at: 5/14/2014 (09:39)
JDELI10533 SparkPoints: (246,127)
Fitness Minutes: (240,926)
Posts: 455
5/14/14 9:14 A

For the past week I have really been paying attention to the ratio of my protein/carb/fat intake, trying to consume 50% carbs, 20% fat and 30% protein, but I have noticed that the percentages derived on the daily nutrition report don't match the number of grams of each nutrient x calories per gram divided by the total number of calories consumed. I only checked the math for carbs. At first I thought perhaps the calculation subtracted fiber grams from total carbs, but doing that still didn't match up.

For example-so far today I have consumed 421 calories, 45 grams carbs, 10 grams fiber. The Daily Nutrition Report indicates 39.64% carbs, but doing the calculation on my own I get 43% considering total carbs and 33% if fiber grams are subtracted from the total. What gives?

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