thanks Mari.
Quote:
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...food manufacturers subtract certain incompletely-digested carbohydrates--including sugar alcohols, fiber and glycerine--from the total carbohydrates (grams) because not all of the calories from those carbohydrates are completely absorbed by the body. However, subtracting all of the carbohydrate grams is inaccurate because a portion of them are absorbed.
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this tells me that in fact the relationship is not 1:1 and things are rather more complex. that is basically what i wanted to know. the net carb "equation" will reflect fewer calories than your body actually absorbs.