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Coffee itself is the problem.
The first sip does make you feel good and increases energy for a short period, however it also causes blood vessels in your brain to constrict making you retarded. As you grow dependent on caffeine, you then get a caffeine "low" as your body adapts to the high glucose by using less, so when you are off the caffeine and blood glucose is normal you become sluggish and depressed. This in turn makes you retarded as your brain is now using less energy, except even after the caffeine has worn off. At this point you only drink coffee to feel normal for a short time.
And you don't even realize it. It is not easy to detect what is happening, when you start using coffee you feel great and because dependence hasn't set in, your intelligence decreases, but you can't feel this. Because the dependence is gradual you don't connect it to coffee usage. You are only aware of the brief high you get shortly after drinking coffee, forever chasing that first high. Some call it the devil's bean, others the jew's roast, in any case it should not have been in your veins to begin with.
