Global consumption of caffeine has been estimated at 120,000tonnes per year, making it the world's most popular psychoactive substance. [22] This amounts to an average of one serving of a caffeinated beverage for every person every day. [22] The consumption of caffeine has remained stable between 1997 and 2015. [281] Coffee, tea and soft drinks are the most important caffeine sources, with energy drinks contributing little to the total caffeine intake across all age groups. [281] Religions

After a long week, there’s nothing better than sipping a glass of wine, putting on your favorite show, and slapping on some soothing under-eye masks. It’s no secret that there’s a certain self-care ~vibe~ that comes with wearing eye patches, but it turns out that they’re actually super beneficial for your skin, too. What makes the skin under the eyes different? Tea contains small amounts of theobromine and slightly higher levels of theophylline than coffee. Preparation and many other factors have a significant impact on tea, and color is a very poor indicator of caffeine content. Teas like the pale Japanese green tea, gyokuro, for example, contain far more caffeine than much darker teas like lapsang souchong, which has very little. [231] Soft drinks and energy drinksKohn R, Keller M (2015). "Chapter 34 Emotions". In Tasman A, Kay J, Lieberman JA, First MB, Riba M (eds.). Psychiatry. Vol.1. New York: John Wiley & Sons. pp.557–558. ISBN 978-1-118-84547-9. Table 34-12... Caffeine Intoxication – Euphoria Some people use caffeine-containing beverages such as coffee or tea to try to treat their asthma. [45] Evidence to support this practice is poor. [45] It appears that caffeine in low doses improves airway function in people with asthma, increasing forced expiratory volume (FEV1) by 5% to 18% for up to four hours. [46] a b c d e f g h i j k l m n o p "Caffeine". DrugBank. University of Alberta. 16 September 2013. Archived from the original on 4 May 2015 . Retrieved 8 August 2014. Since this observation was first published, caffeine addiction has been added as an official diagnosis in ICDM9. This decision is disputed by many and is not supported by any convincing body of experimental evidence.... All of these observations strongly suggest that caffeine does not act on the dopaminergic structures related to addiction, nor does it improve performance by alleviating any symptoms of withdrawal

Nehlig A, Armspach JP, Namer IJ (2010). "SPECT assessment of brain activation induced by caffeine: no effect on areas involved in dependence". Dialogues in Clinical Neuroscience. 12 (2): 255–63. doi: 10.31887/DCNS.2010.12.2/anehlig. PMC 3181952. PMID 20623930. Caffeine is not considered addictive, and in animals it does not trigger metabolic increases or dopamine release in brain areas involved in reinforcement and reward.... these earlier data plus the present data reflect that caffeine at doses representing about two cups of coffee in one sitting does not activate the circuit of dependence and reward and especially not the main target area, the nucleus accumbens.... Therefore, caffeine appears to be different from drugs of dependence like cocaine, amphetamine, morphine, and nicotine, and does not fulfil the common criteria or the scientific definitions to be considered an addictive substance. 42 The metabolism of caffeine is reduced in pregnancy, especially in the third trimester, and the half-life of caffeine during pregnancy can be increased up to 15 hours (as compared to 2.5 to 4.5 hours in non-pregnant adults). [79] Current evidence regarding the effects of caffeine on pregnancy and for breastfeeding are inconclusive. [28] There is limited primary and secondary advice for, or against, caffeine use during pregnancy and its effects on the fetus or newborn. [28] The earliest credible evidence of either coffee drinking or knowledge of the coffee plant appears in the middle of the fifteenth century, in the Sufi monasteries of the Yemen in southern Arabia. [249] From Mocha, coffee spread to Egypt and North Africa, and by the 16th century, it had reached the rest of the Middle East, Persia and Turkey. From the Middle East, coffee drinking spread to Italy, then to the rest of Europe, and coffee plants were transported by the Dutch to the East Indies and to the Americas. [250] Snel J, Lorist MM (2011). "Effects of caffeine on sleep and cognition". Human Sleep and Cognition Part II - Clinical and Applied Research. Progress in Brain Research. Vol.190. pp.105–17. doi: 10.1016/B978-0-444-53817-8.00006-2. ISBN 978-0-444-53817-8. PMID 21531247.Some textbooks state that caffeine is a mild euphoriant, [104] [105] [106] while others state that it is not a euphoriant. [107] [108] Kuczkowski KM (November 2009). "Caffeine in pregnancy". Archives of Gynecology and Obstetrics. 280 (5): 695–8. doi: 10.1007/s00404-009-0991-6. PMID 19238414. S2CID 6475015.