A kilocalorie is not something a food contains — it is a measurement of the energy released when the body oxidises what the food is made of. Only four substances yield it: carbohydrate 4, protein 4, fat 9, and alcohol 7 kilocalories per gram. Type in grams below and watch the total assemble itself.
Grams in, kilocalories out
Total energy0kcal
4 · 4 · 9 · 7. Carbohydrate 4, protein 4, fat 9, alcohol 7 kcal per gram. These are Atwater factors — average net values that already subtract what is lost in digestion and in urine, so they estimate the energy the body actually gets, not the heat a laboratory bomb calorimeter measures. strong evidence
Count the caloriesenter grams — the total builds itself
Grams are rounded, illustrative values of the kind printed on a Nutrition Facts panel. They describe composition — nothing here ranks a food.