Caffeine has positive cognitive and physiological effects at moderate doses.
Image thanks to Benjah-bmm27.
Yes, coffee may reduce cancer risk, but what about the caffeine? Oh, you mean the substance that increases energy availability and expenditure, decreases fatigue and the sense of effort associated with physical activity, enhances physical, motor, and cognitive performance, increases alertness, wakefulness and feelings of energy, decreases mental fatigue, quickens reactions, and increases their accuracy, increases the ability to concentrate and focus attention, enhances short-term memory, the ability to solve problems, the ability to make correct decisions, enhanceing cognitive functioning capabilities and neuromuscular coordination, and in otherwise healthy non-pregnant adults is safe. That caffeine?
What do they mean by moderate amounts, though? Up to a thousand milligrams, about 10 cups of coffee a day.
What about this though. A case of fatal caffeine poisoning. 21 year woman—10,000 mg of caffeine, by swallowing a bottle of caffeine pills. The equivalent to about hundred cups of coffee at one time is, indeed, too much.
The non-pregnant is an important caveat, though. New advice has been issued to restrict caffeine intake in pregnancy to under just 200 mg a day.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring watch the above video. This is just an approximation of the audio contributed by veganmontreal.
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The "coffee may reduce cancer risk" is a reference to yesterday’s video. There are additional cognitive benefits afforded by the phytonutrient theanine in green tea. See Dietary Brain Wave Alteration, and hundreds of other videos onmore than a thousand subjects. Note that the caffeine and pregnancy study is publicly accessible, so you can download it by clicking on the link above in the Sources Cited section.