Is 4cal/gram for carbs & proteins an exact number?

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romaxe
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Is 4cal/gram for carbs & proteins an exact number?

#1 Postby romaxe » Tue Jun 06, 2006 7:34 am

I'm asking this because I've heard some people saying carbs and proteins have 5cal/g and also..when reading the nutrient info for certain things I buy and do my 4/4/9 calorie math..it doesn't add up properly. Does anyone know if these 4,4,9 numbers are exact? or are they just approximations?
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Kathryn
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#2 Postby Kathryn » Tue Jun 06, 2006 9:45 am

I've never heard or read any source that says protein and carbs have 5 calories per gram. But, it's very likely that the numbers for calories per gram usually associated with macronutrients (4 for carbs and protein, 9 for fat, 7 for alcohol...which isn't really a macronutrient, but it does have a different calorie count) are rounded up or down. So maybe protein is something like 3.9 and carbs are 4.2.

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Odidnetne
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#3 Postby Odidnetne » Tue Jun 06, 2006 9:50 am

Well, it's not even that. It might be that the amount of protein/fat/carbs in the product you're consuming is just rounded down or up.

For instance, if you had 6.5 grams of protein, that's 26 calories.

romaxe
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#4 Postby romaxe » Wed Jun 07, 2006 9:50 am

i've just heard that protein actually has 5 but because nitrogen is not used as nergy it's considered as 4 calories.
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joelbct
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#5 Postby joelbct » Wed Jun 07, 2006 7:00 pm

I think I remember from chemistry class that the 4/4/9 is exact, they calculate it by the molecule or something- I'm sure you could search for nutrition or chemistry or nutritional chemistry on www.wikipedia.org for an in depth explanation-

JB

romaxe
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#6 Postby romaxe » Thu Jun 08, 2006 3:45 am

oh well..ill just stick with 4/4/9
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