Caffeine helps quickly boost wakefulness following general anesthesia, a new study finds. The stimulant—used daily by more than 90 percent of adults in the U.S.—appears to alter physiological function in two different ...
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Combine a product widely loved with a disease widely dreaded and what do you get? Widespread attention, a UWM researcher found.
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Researchers compared the caffeine and chlorogenic acid components of coffee beans at different roasting levels and tested the protective antioxidant and anti-inflammatory properties of the different coffee extracts in human ...
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Women who smoke more than 10 cigarettes a day during pregnancy are much more likely to give birth to babies who will fail to grow all their teeth, new University of Otago research has found.
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A coffee, a caffeinated drink and an energy soda proved a deadly combination for a South Carolina teenager who died within two hours of consuming them, triggering warnings about the risks of caffeine overdose.
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(HealthDay)—You'll feel more energized if you do some easy stair walking rather than drinking caffeine, a new study recommends.
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Drinking 32 ounces of a commercially available energy drink resulted in more profound changes in the heart's electrical activity and blood pressure than drinking 32 ounces of a control drink with the same amount of caffeine ...
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A rigorous, new scientific Systematic Review paper on caffeine safety confirms the results of the widely-cited Health Canadai literature review (2003), which concluded that adverse health effects were not associated with ...
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A midday jolt of caffeine isn't as powerful as walking up and down some stairs, according to new research from the University of Georgia.
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For a long time people have been told that caffeine is a diuretic. For some, this translates into advice to avoid or remove caffeinated beverages from the diet of people at risk of dehydration, or during periods of extreme ...
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Caffeine is a bitter, white crystalline xanthine alkaloid that is a psychoactive stimulant drug. Caffeine was discovered by a German chemist, Friedrich Ferdinand Runge, in 1819. He coined the term "kaffein", a chemical compound in coffee, which in English became caffeine. Caffeine is also part of the chemical mixtures and insoluble complexes guaranine found in guarana, mateine found in mate, and theine found in tea; all of which contain additional alkaloids such as the cardiac stimulants theophylline and theobromine, and often other chemicals such as polyphenols which can form insoluble complexes with caffeine.
Caffeine is found in varying quantities in the beans, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants. It is most commonly consumed by humans in infusions extracted from the cherries of the coffee plant and the leaves of the tea bush, as well as from various foods and drinks containing products derived from the kola nut. Other sources include yerba mate, guarana berries, and the Yaupon Holly.
In humans, caffeine is a central nervous system (CNS) stimulant, having the effect of temporarily warding off drowsiness and restoring alertness. Beverages containing caffeine, such as coffee, tea, soft drinks, and energy drinks enjoy great popularity. Caffeine is the world's most widely consumed psychoactive substance, but unlike many other psychoactive substances it is legal and unregulated in nearly all jurisdictions. In North America, 90% of adults consume caffeine daily. The U.S. Food and Drug Administration lists caffeine as a "Multiple Purpose Generally Recognized as Safe Food Substance".
Caffeine has diuretic properties, at least when administered in sufficient doses to subjects who do not have a tolerance for it. Regular users, however, develop a strong tolerance to this effect, and studies have generally failed to support the common notion that ordinary consumption of caffeinated beverages contributes significantly to dehydration.
This text uses material from Wikipedia, licensed under CC BY-SA
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