Our expert says:
Yes, a calorie is a calorie, but some foods contain so little energy (most of the food is actually water which contains zero calories), that you use up more energy digesting the food than it contains. Foods with a 'negative calorie' content include: lettuce, gherkins, tomatoes, grapefruit, watercress, berries, celery, cucumber - but it is impossible to survive on these foods alone. One would also have to eat such large amounts of any of these foods to attain the amount of energy in say a tablespoon of oil or a slab of chocolate that you would be eating all day long.
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