The system for counting calories comes from chemist Wilbur Atwater. To find out how much energy we get from eating, he measured the nutritional value in food and subtracted the amount of energy left in people's bodily excretion.
His research resulted in the 4-9-4 rule: Each gram of protein, fat, and carbohydrate provides 4, 9, 4 calories of energy, respectively.
Nutritionists are calling for calorie intake and nutrition information to be reviewed.
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