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I noticed too that my skin was less greasy when I quit drinking coffee abruptly.

After quitting, I had cramps in legs for 7 days while lying to the point I had trouble falling asleep.

My skin is very greasy, I drink about 4 big cups a day sipping constantly, to maintain the same level of caffeine to improve coding skills, but when I have long vacations (two weeks) I don't see any side effects like headaches and my skin is probably even greasier. Also I don't have any trouble sleeping with or without coffee, but I drink only until end of work (16:00 for me). So, everyone is different. If I don't drink coffee, I feel it very well when trying to code, I can even detect by effects if some cofee is low on caffeine.

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