I’m guessing the confusion stems from the fact that coffee “gives you energy” without any calories, since calories are what generally give us energy.
Think of your body/brain as having a gas pedal and a brake pedal. Calories press the gas pedal and make you go faster. Caffeine pulls away on the brake pedal.
Caffeine won’t actually give you any more energy, but if you’re getting sleepy (i.e. your body is hitting the brakes) caffeine will reduce that, and make you feel more awake.
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