The food was placed in a sealed container surrounded by water--an apparatus known as a bomb calorimeter. The food was completely burned and the resulting rise in water temperature was measured.
This method is not frequently used today. The NLEA requires that the Calorie level placed on a packaged food be calculated from food components. In this system, calories are not determined directly by burning the foods.
Instead, the total caloric value is calculated by adding up the calories provided by the energy-containing nutrients: protein, carbohydrate, fat and alcohol. Because carbohydrates contain some fiber that is not digested and utilized by the body, the fiber component is usually subtracted from the total carbohydrate before calculating the calories.
These numbers were originally determined by burning and then averaging. Thus the label on an energy bar that contains 10 g of protein, 20 g of carbohydrate and 9 g of fat would read kcals or Calories. At this site you can also download the food database to a handheld computer. Already a subscriber? Paris' wedding dress is what dreams are made of. Meghan on the money saving trick she still uses. Best Christmas decorations for Getty Images. Related Story. This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses.
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