date:Feb 20, 2013
that is not reflected on food packaging.
For more than 100 years, calorie value in foods has been calculated using the Atwater system. Nutritionists calculate the calorie values of individual foods by applying calorie conversion factors to each gram of protein, fat, and carbohydrate analyzed in foods, said British nutritionist Geoffrey Livesey, who also spoke on the AAAS panel.
Generally speaking, he said the system means 1 gram of protein or carbohydrate provides 4 calories, while 1 gram of f