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In short, almost none. Caffeine, while associated with the subjective experience of energy, provides nothing of the sort. Rather, caffeine blocks the neurotransmitter adenosine which is responsible for sleep.

As a more literal answer, 8 ounces of drip coffee (without milk or sugar) contains about 2 kilocalories (what are commonly known as calories on food labels, and which is a measurement of the energy produced when burned), the amount of chemical energy necessary to raise 2ml of water 2,000 degrees centigrade. This is equivalent to 8,368 joules.

The addition of milk, sugar, creamer, delicious syrupy flavors, and the likes increase the caloric value of coffee.

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