I agree that ideally it isn't best for a masters state of mind because it renders you slightly less flexible, more just on...but bodily wise, and due to what it takes in the world to even have time in peace, it can be a useful tool. The body and social life are complex, and sometimes its a balance thing to where at the end of the day or those times you actually are free to enjoy yourself, using coffee at certain times overall creates a bit more optimum overall balance. Like coffee might not be good for the day youre actually relaxing on the beach or meditating, but it can be good during the time you had to work to earn that situation. In our current society, if youre full on more often you will be obliged to take care of daily tasks, clean, and do other stuff like that rather than retire to the PC or TV or something, so drinking coffee regularly can help you not get backed up with your job work or home work, as well as keeping the heart rate up keeps GI peristalsis rate up also...which means youre less likely to get constipated or retain water. However, it does have a few downsides that you have to compensate for so that its benefits over time can be seen. Tannins, bind protein, can make gut irritated or acidic, can bind stool, and stain teeth. Low roasts have more chlorogenic acid, which can temporarily mess with blood sugar, the caffeine can make you have to eat more overall without becoming ravenous, and the water content of a brewed drink has to be accounted for, either with the stereotypical pastry, or just by adding sufficient sugar to the drink...unless its a concentrated espresso, or you actually ate the beans (in which case the fibers would also be an irritant). Coffee also has some AGE's that might not be good. If used wisely and taking in to account all those potential drawbacks, it can be beneficial over time, in our current society for most, due to tis ability to keep one active and their heart active, and their GI flowing...its probably good for the liver also, usually anything that increases activity and feelings of capability is good for the liver. But like I said, if youre a retired person, or youre just someone who is pretty much a master of the mind, like you know how to stay intense willingly through intelligence, good diet, clean pure lifestyle, and regulating GI, and being self motivated and open minded and hearted, its a slight hinderance due to its stimulating action which doesn't allow as much flexibility or a deep receptive state of the mind as easily. It always supplies beneficial nutrients so it could have a role there. I can honestly say from someone who used to drink coffee and other caffeine sources since like...age 15, few cups a day, then recently a few years ago I was way up, like 1-2000 mg a day sometimes, and now having no caffeine other than maybe trace amounts, and knowing people, the society, and most peoples lives and health situations, if used with milk and sugar it would be beneficial to most people, highly beneficial...but to certain people, VERY rare people, its unnecessary and would slightly take away from max potential. As per its longevity aspects, its probably because of above mentioned...when people are moving more in life with a higher heart rate and more feeling of capability and confidence, they just generally do more, interact more, take care of business more, have a more regular GI, and all those factors probably add up over time to a less stressful totality due to less money or other such issues, and potentially the vits and minerals help