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I suggest you read the wiki article: In large amounts, and especially over extended periods of time, caffeine can lead to a condition known as caffeinism. Caffeinism usually combines caffeine dependency with a wide range of unpleasant physical and mental conditions including nervousness, irritability, anxiety, tremulousness, muscle ...

Apparently they are both prefectly fine for you (and certainly better than drinking nothing), but if you had a choice, then tea is better. Especially if you chose green tea. http://abcnews.go.com/GMA/Diet/story?id=2123324 http://www.associatedcontent.com/article/247591/coffee_vs_tea_whats_better_.html?cat=51 ...

Your caffeine consumption, practically speaking, probably does not affect your workouts positively or negatively. As @JohnP pointed out, caffeine studies are on greater amounts than a couple of cans of tea per day. According to the Sports Med. 2001;31(11):785-807, "ingestion of caffeine as coffee appears to be ineffective compared to doping with pure ...

This was a study of 18 individuals so not really large enough to draw too many conclusions. This was under moderate use of caffeine so it doesn't say anything about the ability to tolerate large amounts of fluid retention. What is, worryingly, not mentioned is the risk of hyponatremia from fluid retention. Lastly, I'm not sure you can conclude that you ...

To get into the details of this, there are two things I suggest you read/watch: Check out this article: Caffeine, Stress and Your Health: Is Caffeine Your Friend or Your Foe? A snippet from it points to one specific hormone: Cortisol - Can increase the body’s levels of cortisol, the “stress hormone”, which can lead to other health consequences ...

I would agree that alternating between tea and coffee is a good idea, but I recommend drinking more tea instead of coffee. I worked in a kitchen for 8 months and would drink strictly coffee, more then a liter a shift and over the span of 8 months it really messed up my nervous system and seemed to have depleted my body of a lot of minerals. Speaking from ...

I have done a lot of research on this, and surprisingly for many - coffee is healthier. Tea companies are funding research (coffee companies also) but I have yet to see CONVINCING evidence for its plausability (I don't care whether egcg, catechins or quercetin are better than tearubigins). By convincing evidence I mean huge prospective, randomized, COHORT ...