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It's true. The average cup of coffee contains 150 mg of caffeine or less. The lethal dose is 150 mg/kg, which means that for the average person who weighs 70 kg, 70 cups of coffee (or that amount of caffeine in a tablet) taken at one time could be deadly. Don't forge that caffeine (C8H10N4O2) is the natural pesticide of coffee beans, paralyzing and killing insects that try to feed on them.
Coffee is the most complex food known to man. It has 1200 flavor components. The nearest comparison is red wine with 450 chemical compounds in the flavor make-up. In most commercial blends there are 10 to 12 different coffees, from different farms (BBC, http://goo.gl/m2LwD). Americans get more antioxidants from coffee than anywhere else.
Caffeine is structurally similar to adenosine. Image source: Wikipedia, public domain.
Is coffee a "health food" now?
Americans get more antioxidants from coffee than anywhere else
Caffeine (C8H10N4O2) is the natural pesticide of coffee beans, paralyzing and killing insects that try to feed on them