Why does my lack of caffeine after having it all the time cause headaches? Like it doesn’t make sense to me.
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“Homeostasis” is your body’s desire to keep everything balanced and within particular ranges/levels. If you supplement your body with a substance it normally has (e.g. caffeine, serotonin, dopamine, etc) your body will adjust/reduce its own production of those substances. Cutting off the external supply means your body will be a bit shocked since it got used to not needing to make its own. That’s why it’s important for many addictive substances to wean yourself off, rather than quitting cold turkey (like alcohol and heroin, and to a lesser extent caffeine).
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