Bitesize: Why Calories Don't Count
Food For Thought
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The Importance of Calories
A food calorie is the amount of energy it takes to raise one liter of water, one degree Celsius at sea level. It's calculated by something using a bomb calorimeter and that's where you put in a piece of desiccated food desiccated because water doesn't have any caloric content per se for human beings. Giles Delves a lot further into the science here looking at macronutrients, looking at the definition of health and body fat - what perhaps we could do in this area in the future.
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