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Coffee costs money, takes time, gives you coffee breath, and makes you pee too often. It can also make you jittery and nervous if you have too much. But if success is your dream and operating at peak mental performance is something you want, coffee is a good bet. I highly recommend it. In fact, I recommend it so strongly that I literally feel sorry for anyone who hasn't developed the habit.

Coffee also allows you to manage your energy levels so you have the most when you need it. My experience is that coffee drinkers have higher highs and lower lows, energywise, than non-coffee drinkers, but that trade-off works. I can guarantee that my best thinking goes into my job, while saving my dull-brain hours for household chores and other simple tasks.