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Cheston P, Smith L (11 October 2013). "Man died after overdosing on caffeine mints". The Independent. Archived from the original on 12 October 2013 . Retrieved 13 October 2013. A systematic review and meta-analysis from 2014 found that concurrent caffeine and L-theanine use has synergistic psychoactive effects that promote alertness, attention, and task switching; [57] these effects are most pronounced during the first hour post-dose. [57] Physical performance
activehours:........xxxxxxxx........ - put 24 . or x characters - which indicate from hour 0 to hour 23 of the day. Caffeine will Mate is a drink popular in many parts of South America. Its preparation consists of filling a gourd with the leaves of the South American holly yerba mate, pouring hot but not boiling water over the leaves, and drinking with a straw, the bombilla, which acts as a filter so as to draw only the liquid and not the yerba leaves. [234] a b c Liguori A, Robinson JH (July 2001). "Caffeine antagonism of alcohol-induced driving impairment". Drug and AlcoSmoking tobacco increases caffeine clearance by 56%. [156] Cigarette smoking induces the cytochrome P450 1A2 enzyme that breaks down caffeine, which may lead to increased caffeine tolerance and coffee consumption for regular smokers. [157] Birth control a b c Bolton S, Null G (1981). "Caffeine: Psychological Effects, Use and Abuse" (PDF). Orthomolecular Psychiatry. 10 (3): 202–211. Archived (PDF) from the original on 6 October 2008. a b c Desk reference to the diagnostic criteria from DSM-5. Arlington, VA: American Psychiatric Association. 2013. pp.238–239. ISBN 978-0-89042-556-5. A neuroprotective effect of caffeine against Alzheimer's disease and dementia is possible but the evidence is inconclusive. [127] [128] Yang TW, Wang CC, Sung WW, Ting WC, Lin CC, Tsai MC (March 2022). "The effect of coffee/caffeine on postoperative ileus following elective colorectal surgery: a meta-analysis of randomized controlled trials". International Journal of Colorectal Disease. 37 (3): 623–630. doi: 10.1007/s00384-021-04086-3. PMC 8885519. PMID 34993568. S2CID 245773922.
Hong CT, Chan L, Bai CH (June 2020). "The Effect of Caffeine on the Risk and Progression of Parkinson's Disease: A Meta-Analysis". Nutrients. 12 (6): 1860. doi: 10.3390/nu12061860. PMC 7353179. PMID 32580456. O'Connor A (4 March 2008). "Really? The claim: caffeine causes dehydration". New York Times. Archived from the original on 3 September 2011 . Retrieved 3 August 2009. In 1827, M. Oudry isolated "théine" from tea, [264] but in 1838 it was proved by Mulder [265] and by Carl Jobst [266] that theine was actually the same as caffeine. Caffeine, noun (feminine). Crystallizable substance discovered in coffee in 1821 by Mr. Robiquet. During the same period– while they were searching for quinine in coffee because coffee is considered by several doctors to be a medicine that reduces fevers and because coffee belongs to the same family as the cinchona [quinine] tree– on their part, Messrs. Pelletier and Caventou obtained caffeine; but because their research had a different goal and because their research had not been finished, they left priority on this subject to Mr. Robiquet. We do not know why Mr. Robiquet has not published the analysis of coffee which he read to the Pharmacy Society. Its publication would have allowed us to make caffeine better known and give us accurate ideas of coffee's composition...
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Salerno BB, Knights EK (2010). Pharmacology for health professionals (3rded.). Chatswood, N.S.W.: Elsevier Australia. p.433. ISBN 978-0-7295-3929-6. In contrast to the amphetamines, caffeine does not cause euphoria, stereotyped behaviors or psychoses. The dependence syndrome may be present for a specific psychoactive substance (e.g., tobacco, alcohol, or diazepam), for a class of substances (e.g., opioid drugs), or for a wider range of pharmacologically different psychoactive substances. [Includes:] Conger SA, Warren GL, Hardy MA, Millard-Stafford ML (February 2011). "Does caffeine added to carbohydrate provide additional ergogenic benefit for endurance?" (PDF). International Journal of Sport Nutrition and Exercise Metabolism. 21 (1): 71–84. doi: 10.1123/ijsnem.21.1.71. PMID 21411838. S2CID 7109086. Archived from the original (PDF) on 14 November 2020. A 2011 review found that increased caffeine intake was associated with a variation in two genes that increase the rate of caffeine catabolism. Subjects who had this mutation on both chromosomes consumed 40mg more caffeine per day than others. [192] This is presumably due to the need for a higher intake to achieve a comparable desired effect, not that the gene led to a disposition for greater incentive of habituation. Levounis P, Herron AJ (2014). The Addiction Casebook. American Psychiatric Pub. p.49. ISBN 978-1-58562-458-4.
Evans J, Richards JR, Battisti AS (January 2019). "Caffeine". StatPearls [Internet] (Mini-review). PMID 30137774. Health Canada has not developed advice for adolescents because of insufficient data. However, they suggest that daily caffeine intake for this age group be no more than 2.5mg/kg body weight. This is because the maximum adult caffeine dose may not be appropriate for light-weight adolescents or for younger adolescents who are still growing. The daily dose of 2.5mg/kg body weight would not cause adverse health effects in the majority of adolescent caffeine consumers. This is a conservative suggestion since older and heavier-weight adolescents may be able to consume adult doses of caffeine without experiencing adverse effects. [72] Pregnancy and breastfeeding Some textbooks state that caffeine is a mild euphoriant, [104] [105] [106] while others state that it is not a euphoriant. [107] [108] Grosso G, Micek A, Castellano S, Pajak A, Galvano F (January 2016). "Coffee, tea, caffeine and risk of depression: A systematic review and dose-response meta-analysis of observational studies". Molecular Nutrition & Food Research. 60 (1): 223–34. doi: 10.1002/mnfr.201500620. PMID 26518745.A cluster of behavioural, cognitive, and physiological phenomena that develop after repeated substance use and that typically include a strong desire to take the drug, difficulties in controlling its use, persisting in its use despite harmful consequences, a higher priority given to drug use than to other activities and obligations, increased tolerance, and sometimes a physical withdrawal state. Caffeine is a bitter, white crystalline purine, a methylxanthine alkaloid, and is chemically related to the adenine and guanine bases of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). It is found in the seeds, fruits, nuts, or leaves of a number of plants native to Africa, East Asia and South America, [18] and helps to protect them against herbivores and from competition by preventing the germination of nearby seeds, [19] as well as encouraging consumption by select animals such as honey bees. [20] The best-known source of caffeine is the coffee bean, the seed of the Coffea plant. People may drink beverages containing caffeine to relieve or prevent drowsiness and to improve cognitive performance. To make these drinks, caffeine is extracted by steeping the plant product in water, a process called infusion. Caffeine-containing drinks, such as coffee, tea, and cola, are consumed globally in high volumes. In 2020, almost 10 million tonnes of coffee beans were consumed globally. [21] Caffeine is the world's most widely consumed psychoactive drug. [22] [23] Unlike most other psychoactive substances, caffeine remains largely unregulated and legal in nearly all parts of the world. Caffeine is also an outlier as its use is seen as socially acceptable in most cultures and even encouraged in others. Robertson D, Wade D, Workman R, Woosley RL, Oates JA (April 1981). "Tolerance to the humoral and hemodynamic effects of caffeine in man". The Journal of Clinical Investigation. 67 (4): 1111–7. doi: 10.1172/JCI110124. PMC 370671. PMID 7009653. Consumption of caffeine after abdominal surgery shortens the time to recovery of normal bowel function and shortens length of hospital stay. [48]
Gaudiya Vaishnavas generally also abstain from caffeine, because they believe it clouds the mind and overstimulates the senses. [284] To be initiated under a guru, one must have had no caffeine, alcohol, nicotine or other drugs, for at least a year. [285] Shen JG, Brooks MB, Cincotta J, Manjourides JD (February 2019). "Establishing a relationship between the effect of caffeine and duration of endurance athletic time trial events: A systematic review and meta-analysis". Journal of Science and Medicine in Sport. 22 (2): 232–238. doi: 10.1016/j.jsams.2018.07.022. PMID 30170953. In 1895, German chemist Hermann Emil Fischer (1852–1919) first synthesized caffeine from its chemical components (i.e. a " total synthesis"), and two years later, he also derived the structural formula of the compound. [267] This was part of the work for which Fischer was awarded the Nobel Prize in 1902. [268] Historic regulationsIn addition to its activity at adenosine receptors, caffeine is an inositol trisphosphate receptor 1 antagonist and a voltage-independent activator of the ryanodine receptors ( RYR1, RYR2, and RYR3). [167] It is also a competitive antagonist of the ionotropic glycine receptor. [168] Effects on striatal dopamine Caffeine is metabolized in the liver by the cytochrome P450 oxidase enzyme system, in particular, by the CYP1A2 isozyme, into three dimethyl xanthines, [188] each of which has its own effects on the body: Decaffeinated" coffees do in fact contain caffeine in many cases– some commercially available decaffeinated coffee products contain considerable levels. One study found that decaffeinated coffee contained 10mg of caffeine per cup, compared to approximately 85mg of caffeine per cup for regular coffee. [208] Detection in body fluids While caffeine does not directly bind to any dopamine receptors, it influences the binding activity of dopamine at its receptors in the striatum by binding to adenosine receptors that have formed GPCR heteromers with dopamine receptors, specifically the A 1– D 1 receptor heterodimer (this is a receptor complex with 1 adenosine A 1 receptor and 1 dopamine D 1 receptor) and the A 2A– D 2 receptor heterotetramer (this is a receptor complex with 2 adenosine A 2A receptors and 2 dopamine D 2 receptors). [169] [170] [171] [172] The A 2A–D 2 receptor heterotetramer has been identified as a primary pharmacological target of caffeine, primarily because it mediates some of its psychostimulant effects and its pharmacodynamic interactions with dopaminergic psychostimulants. [170] [171] [172] Extraction by organic solvents: Certain organic solvents such as ethyl acetate present much less health and environmental hazard than chlorinated and aromatic organic solvents used formerly. Another method is to use triglyceride oils obtained from spent coffee grounds. [207]
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