Coffee is pretty much all I drink. My coffee can (Folgers) claims it will make 380 cups. I go through a can about once every 2 months... so ~400*6 = 2400 cups p

Coffee is pretty much all I drink. My coffee can (Folgers) claims it will make 380 cups. I go through a can about once every 2 months... so ~400*6 = 2400 cups per year. There is a fine line to walk. I can't read my computer screen when I first wake up until the coffee kicks in. The upper limit is reached when my ears close up (like when you're under water). The game is to sip coffee to keep between these two extremes. As for "alertness"? I find that coffee seems to have no effect. Eating, however, completely trashes alertness. Your mileage may vary.