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I see people that drink 3-4 cups per day that get a massive headache if they don't have their daily coffee due to caffeine withdrawal.  I choose to avoid this addiction by only drinking 1 cup per day max.  I drink various teas like green, oolong, black, and white teas at other times, which are much lower in caffeine.  Or I like to use rooibos or other herbal teas many times which have no caffeine at all.

It’s enough to make a tea drinker buy an espresso machine. In a new study scientists in Germany report they were able to modify a common age-related defect in the hearts of mice with doses of caffeine equivalent to four to five cups of coffee a day for a human. The paper—the latest addition to a growing body of research that supports the health benefits of drinking coffee—describes how the molecular action of caffeine appears to enhance the function of heart cells and protect them from damage.

Long term consumption of coffee has also been shown to reduce, although moderately, the risk of stroke (38). Another study pointed out that drinking about five or six cups of coffee a day is associated with the greatest reduction (39) (36%) in stroke risk, and that coffee also contributes to overall reduction of cardiovascular mortality (a less scary way of saying “heart death”).

There’s no need to try anything crazy; the only performance enhancer you really need is coffee. Research has shown its ability to give workouts a boost and increase athletic performance, and that’s exactly why you’ll find so many Olympians drinking it: One report from the journal Applied Physiology, Nutrition, and Metabolism found the majority of the 20,686 Olympic athletes analyzed had caffeine in their urine.
You probably think of coffee as a pick-me-up. But its effects don’t kick in for about 30 minutes. That means if you enjoy a cup of coffee just before taking a 20-30 minute nap, you may wake up feeling extra-energized. Just be sure you don't try this hack too late in the afternoon; it's best to stop consuming caffeine six hours before you hit the hay.

The only negative health effects the review found were among women, who were at slightly higher risk of developing fractures if they drank more coffee, and pregnant women. Pregnant women who drank more coffee tended to have higher rates of miscarriage, more premature births and more babies born with low birthweight than women who drank less coffee, the study found.
For this part of the experiment, 22-month-old mice received caffeine—the daily equivalent of four to five cups of coffee in humans—in their drinking water for 10 days. That was sufficient to raise their mitochondrial respiration to the levels observed in six-month-old mice, according to the study. Analysis showed the old mice had roughly double the amount of p27 in their mitochondria after the 10 days of caffeine.

"My guess is that they're working together to have some of these benefits," Harvard researcher Walter Willett, who authored a similar study that found a link between coffee consumption and lower risk of early death, told NPR in 2015. “The coffee bean itself is loaded with many different nutrients and phyto-chemicals,” many of which aid in insulin resistance and inflammation reduction.
Haendeler, who drinks six cups of coffee a day, says it can be part of a healthy lifestyle—but is no miracle cure. And she is quick to point out there are no shortcuts to good health. “If you hear about this study and decide to drink coffee but you do nothing else—no exercise, no proper diet—then, of course, this will not work,” she says. “You cannot simply decide, ‘Okay, I’m sitting here and drinking four, five or six cups of coffee and everything is fine.'”
If you can’t go completely black with your coffee, try adding a small amount of stevia. While not 100% perfect, this choice is certainly better than consuming the artificial sweeteners and refined sugar which are usually found in most cups. Coconut sugar or organic maple syrup can also be used, but the real key here is adding a very small amount. Don’t go overboard!

At least for those that consume instant coffee that they prepare themselves, more important than talking in terms of cups is to mention that 1 gr of instant coffee contains 32 mg caffeine (that’s what I found, don’t trust me, do your own research; besides that, it may vary with the type of coffee beans etc), and that 1 rounded teaspoon of instant coffee means 1.8 grams of coffee (so, 1 rounded teaspoon of instant coffee = 57 mg caffeine, 7 rounded teaspoons will make the upper daily limit, 400 mg of caffeine).
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