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This is what coffee does to your body. Caffeine is the most addicted to substance on the entire earth. You or your parents probably have a caffeine addiction. Even myself, I started consuming caffeine daily 4 years ago, and I'm 24. But what does it do to your body? Good question. To keep it short and simple, it makes your brain feel more awake by blocking a chemical called adenosine, which is a chemical in your body that signals to your brain that you're feeling sleepy or it's time to sleep. So,