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Caffeine gives most people a temporary energy boost and elevates mood. Caffeine is in tea, coffee, chocolate, many soft drinks, and pain relievers and other over-the-counter medications. In its natural form, caffeine tastes very bitter. But most caffeinated drinks have gone through enough processing to camouflage the bitter taste. Teens usually get most of their caffeine from soft drinks and energy drinks. In addition to caffeine, these also can have added sugar and artificial flavors. Caffeine is not stored in the body, but you may feel its effects for up to 6 hours.

Many people feel that caffeine increases their mental alertness.

Higher doses of caffeine can cause anxiety, dizziness, headaches, and the jitters. Caffeine can also interfere with normal sleep. Caffeine sensitivity the amount of caffeine that will produce an effect in someone varies from person to person. On average, the smaller the person, the less caffeine needed to produce side effects. Caffeine sensitivity is most affected by the amount of caffeine a person has daily. People who regularly take in a lot of caffeine soon develop less sensitivity to it.

Effects of caffeine

This means they may need more caffeine to achieve the same effects. Caffeine is a mild diuretic, meaning it causes a person to urinate pee more. Caffeine also may cause the body to lose calcium, and that can lead to bone loss over time. Drinking caffeine-containing soft drinks and coffee instead of milk can have an even greater impact on bone density and the risk of developing osteoporosis. Caffeine can aggravate certain heart problems.

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It also may interact with some medicines or supplements. If you are stressed or anxious, caffeine can make these feelings worse. Although caffeine is sometimes used to treat migraine headaches, it can make headaches worse for some people. Caffeine is usually thought to be safe in moderate amounts. Experts consider — mg of caffeine a day to be a moderate amount for adults.

Caffeine Chart

But consuming as little as mg of caffeine a day can lead a person to become "dependent" on caffeine. This content does not have an English version. This content does not have an Arabic version. Make an appointment. Visit now. Explore now. Choose a degree. Get updates. Give today. Healthy Lifestyle Nutrition and healthy eating. Products and services. Free E-newsletter Subscribe to Housecall Our general interest e-newsletter keeps you up to date on a wide variety of health topics. Sign up now. Caffeine: How much is too much? By Mayo Clinic Staff.

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References Bordeaux B, et al. Benefits and risks of caffeine and caffeinated beverages. Accessed Nov.

Symptoms of Use

Dietary guidelines for Americans, Department of Health and Human Services. Renda G, et al. Genetic determinants of cognitive responses to caffeine drinking identified from a double-blind, randomized, controlled trial. European Neuropharmacology. Bope ET, et al. Popular herbs and nutritional supplements. In: Conn's Current Therapy Philadelphia, Pa. Natural Medicines Comprehensive Database. Svatikova A, et al. Journal of the American College of Cardiology. Maski K. Insufficient sleep: Evaluation and management. Heckman MA, et al.

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Caffeine 1, 3, 7-trimethylxanthine in foods: A comprehensive review on consumption, functionality, safety, and regulatory matters. Journal of Food Science. Zeratsky K expert opinion.

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