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Joules are usually used by scientists. Energy is energy, so energy (and work) in physics are always measured in joules. However, if you are talking chemistry, often calories are used. The "calories" in food are actually kilocalories. That is, 150 calories worth of chips are in reality 150 kilocalories, which equals 150,000 calories. (kilo means "times 1000")

Here is a clip from wikipedia on calories:

A calorie is a unit of measurement for energy. In most fields, it has been replaced by the joule, the SI unit of energy. However, the kilocalorie or calorie remains in common use for the amount of food energy. The calorie was first defined by Professor Nicolas Clément in 1824 as a kilogram-calorie and this definition entered French and English dictionaries between 1842 and 1867. The calorie was never an SI unit. Modern definitions for calorie fall into two classes: * The small calorie or gram calorieapproximates the energy needed to increase the temperature of 1 gram of water by 1 °C. This is about 4.184 joules. * The large calorie or kilogram calorie approximates the energy needed to increase the temperature of 1 kg of water by 1 °C. This is about 4.184 kJ, and exactly 1000 small calories.

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