Why don’t the numbers add up?

LosinIt54

I just scanned a piece of pork loin from the supermarket. The info came up (per 2 oz):
85 calories
0 carbs
4 fat
10 protein

So...if carbs and protein are 4 calories per gram and fat is 9 calories per gram, how come that only adds up to 76 calories, yet the nutritional information, from the grocery store is over 10% different at 85 calories?
I notice this a lot. Can someone explain? Am I missing something?
Thank you, MFP friends.

middlehaitch

Rounding up and down happens.
Use the USDA data base for double checking.

Cheers, h.

CharlieBeansmomTracey

LosinIt54 wrote: »

I just scanned a piece of pork loin from the supermarket. The info came up (per 2 oz):
85 calories
0 carbs
4 fat
10 protein

So...if carbs and protein are 4 calories per gram and fat is 9 calories per gram, how come that only adds up to 76 calories, yet the nutritional information, from the grocery store is over 10% different at 85 calories?
I notice this a lot. Can someone explain? Am I missing something?
Thank you, MFP friends.

even scanned entries can be off. they are entered by users as well. one reason I stopped scanning my food bar codes

LosinIt54

So what values do you use?

CharlieBeansmomTracey

LosinIt54 wrote: »

So what values do you use?

I look up whats on the package and cross reference and find an entry that matches it or I make a new one, I also use the USDA database like Middlehaitch mentioned.

middlehaitch

As I mentioned above. The USDA Data base, for packaged items the package or the mfg website.

https://community.myfitnesspal.com/en/discussion/10621050/how-to-use-the-usda-food-database-mfp-food-database-for-accurate-logging/p1

Cheers, h.

JeromeBarry1

U.S. law allows the nutrition label calories to be 20% away from accurate. That happens because manufacturers captured the regulators and wrote the laws in such a way that the manufacturers will never lose a lawsuit over nutrition labels.

JeromeBarry1

LosinIt54 wrote: »

So what values do you use?

It's almost impossible to make a recommendation. Pick a method. Use it. Evaluate it after a month.

CharlieBeansmomTracey

JeromeBarry1 wrote: »

U.S. law allows the nutrition label calories to be 20% away from accurate. That happens because manufacturers captured the regulators and wrote the laws in such a way that the manufacturers will never lose a lawsuit over nutrition labels.

yes and that is per serving too

lynn_glenmont

middlehaitch wrote: »

Rounding up and down happens.
Use the USDA data base for double checking.

Cheers, h.

The numbers on the label are whole numbers. In the real world, a serving of food does not have to contain a whole number of grams of any particular macro.

4 (0.49 g carbs + 10.49 g protein) + 9 (4.49 g fat) = 43.92 + 40.41 = 84.33 calories

I believe they're allowed to round to the nearest 5 calories (and above some level, they can round to the nearest 10 calories.

Mystery solved. No discrepancy.

LosinIt54

Thanks all