2006-06-11 19:48:21 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
The food sample is broken down into its basic constituents and each of them is then tested in a bomb calorimeter.
2006-06-11 19:52:27 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 2⤋
Calorie count of package food is based entirely on the ingredients. It is common fact that carbohydrates and proteins contain 4 calories of energy each per gram, and fats contain 9 calories per gram. These key constituents are just multiplied by the above numbers to determine calorie count. Occasionally, calories are slightly above or slightly below the estimated number (by a few calories). This is because rounding for grams is typically done to the nearest gram, while calories are typically rounded to the nearest 5 or 10.
2006-06-11 21:23:01 · answer #2 · answered by nomae_pl 2 · 0⤊ 0⤋
They have tables and weights of all foods and they just calculate according to the weight.. The figures are close but not 100% accurate...
2006-06-11 21:08:59 · answer #3 · answered by simsjk 5 · 0⤊ 0⤋
Basically you just burn it and carefully measure how much heat is released... heat and energy (even food energy) are just different forms of the same thing.
2006-06-11 20:10:43 · answer #4 · answered by eggman 7 · 0⤊ 0⤋