What happens in the body when someone who is caffeine-dependent doesn’t get their coffee?

Question

Does the other 90% of the brain that we can’t use get activated?

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edit: thanks for the scientific explanations

In: Biology

Answer 1

When you’re caffeine dependent, your body builds many adenosine receptors (receptors that make you feel tired when certain molecules are attached to them). Coffee basically blocks these receptors, and that’s why your body builds more. When you stop consuming coffee, nothing blocks the receptors, so you feel extra tired now because you have too many of them.