The SI unit for energy is joule, but food energy is sometimes still measured in the old unit, calories. Note that when they say "Calories" (usually spelled with an uppercase "C"), actually they...
Energy in food is measured in calories.
If you burn 1 gram of fat, you will get 9 calories.
If you burn 1 gram of carbohydrates, you will get 4 calories.
If you burn 1 gram of protein, you will...
it's calories in any science, physics or otherwise. If you mean to find a specific amount of energy released through the burning of calories, e.g., how much energy is found in a hamburger, let me...