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?
06-06-2006, 05:59 AM #1
Is 4cal/gram for carbs & proteins an exact number?-----------------
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06-06-2006, 06:02 AM #2
06-06-2006, 06:29 AM #3
As per my Principles and Nutrition class notes:
Carbohydrates = 4 Calories per gram (4 Cal/g)
Protein= 4 Cal/g
Fats= 9 Cal/g
Alcohol= 7 Cal/g
Calories burn in that same order. Carb calories burn first, followed by protein and then fats. Alcohol calories burn last.Kinesiology student
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06-06-2006, 06:30 AM #4
06-06-2006, 06:40 AM #5
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06-06-2006, 01:51 PM #6
They are also slightly different for different foods, but close enough to 4 not to worry about it.
The fact is, when you injest a certain carb, it is not trivial to tell exactly how much energy is available to your body to 2 significant figures and may not only depend on the carb, but also on the person, what else they eat with the meal , when it is eaten etc..
These are all MINOR variations though (al least in most cases).
One reason the food labels do not always add up if the different methodologies used to estimate g of macros and total caloires (they do not always simply add up the macros, even without rounding).
06-06-2006, 02:26 PM #7
06-07-2006, 07:36 AM #8