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Caffeine is not the sole cause of our sleep crisis; screens, alcohol (which is as hard on REM sleep as caffeine is on deep sleep), pharmaceuticals, work schedules, noise and light pollution, and anxiety can all play a role in undermining both the duration and quality of our sleep. But here’s what’s uniquely insidious about caffeine: the drug is not only a leading cause of our sleep deprivation; it is also the principal tool we rely on to remedy the problem. Most of the caffeine consumed today is being used to compensate for the lousy sleep that caffeine causes – which means that caffeine is helping to hide from our awareness the very problem that caffeine creates. Other studies show that drinking 2–4 cups of coffee or green tea per day is linked to a 14–20% lower risk of stroke ( 30, 31). 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. Interestingly, consuming decaffeinated coffee was also linked to a 21% lower risk of diabetes. This indicates that other beneficial compounds in coffee can also protect against type 2 diabetes ( 36). Summary Theophylline (4%): Relaxes smooth muscles of the bronchi, and is used to treat asthma. The therapeutic dose of theophylline, however, is many times greater than the levels attained from caffeine metabolism. [46]

Children under 18 years should consume less than 3mg for each kilo of body weight a day. For a 40kg child, this is about 120mg a day, or 2 cans of cola (375mL). There is evidence that amounts greater than this can cause increased anxiety. O'Callaghan F, Muurlink O, Reid N (7 December 2018). "Effects of caffeine on sleep quality and daytime functioning". Risk Management and Healthcare Policy. 11: 263–271. doi: 10.2147/RMHP.S156404. PMC 6292246. PMID 30573997. Hillis DM, Sadava D, Hill RW, Price MV (2015). Principles of Life (2ed.). Macmillan Learning. pp.102–103. ISBN 978-1-4641-8652-3. Gout prevention. Regularly drinking 4 cups of coffee per day may reduce the risk of developing gout by 40% in men and 57% in women ( 50, 51).

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The effect of caffeine on your health is complex. It can cause some health problems, but it can also reduce your chances of having others. Because caffeine is a stimulant, it can make you feel more alert and energetic. Skin protection. Consuming 4 or more cups of caffeinated coffee per day may lower the risk of skin cancer by 20% ( 46, 47). One review reports that after participants ingested 37.5–450 mg of caffeine, they had improved alertness, short-term recall, and reaction time ( 1). Longevity. Drinking coffee may decrease the risk of premature death by as much as 30%, especially for women and people with diabetes ( 39, 40). Is your kid over-caffeinated? Academy of Nutrition and Dietetics. https://www.eatright.org/food/nutrition/healthy-eating/is-your-kid-over-caffeinated. Accessed Feb. 1, 2020.

Reduced MS risk. Coffee drinkers may have up to a 30% lower risk of developing multiple sclerosis (MS). However, not all studies agree ( 48, 49). Ask your pharmacist or doctor if any medicines that you take could be affected by caffeine. Caffeine, alcohol and illicit drugs The earliest evidence of cocoa bean use comes from residue found in an ancient Mayan pot dated to 600 BCE. Also, chocolate was consumed in a bitter and spicy drink called xocolatl, often seasoned with vanilla, chile pepper, and achiote. Xocolatl was believed to fight fatigue, a belief probably attributable to the theobromine and caffeine content. Chocolate was an important luxury good throughout pre-Columbian Mesoamerica, and cocoa beans were often used as currency. [251] EFSA Panel on Dietetic Products, Nutrition and Allergies (2015). "Scientific Opinion on the safety of caffeine". EFSA Journal. 13 (5): 4102. doi: 10.2903/j.efsa.2015.4102.Caffeine overdose can result in a state of central nervous system overstimulation known as caffeine intoxication, a clinically significant temporary condition that develops during, or shortly after, the consumption of caffeine. [140] This syndrome typically occurs only after ingestion of large amounts of caffeine, well over the amounts found in typical caffeinated beverages and caffeine tablets (e.g., more than 400–500mg at a time). According to the DSM-5, caffeine intoxication may be diagnosed if five (or more) of the following symptoms develop after recent consumption of caffeine: restlessness, nervousness, excitement, insomnia, flushed face, diuresis, gastrointestinal disturbance, muscle twitching, rambling flow of thought and speech, tachycardia or cardiac arrhythmia, periods of inexhaustibility, and psychomotor agitation. [141] Supercritical carbon dioxide extraction: Supercritical carbon dioxide is an excellent nonpolar solvent for caffeine, and is safer than the organic solvents that are otherwise used. The extraction process is simple: CO 2 is forced through the green coffee beans at temperatures above 31.1°C and pressures above 73 atm. Under these conditions, CO 2 is in a " supercritical" state: It has gaslike properties that allow it to penetrate deep into the beans but also liquid-like properties that dissolve 97–99% of the caffeine. The caffeine-laden CO 2 is then sprayed with high-pressure water to remove the caffeine. The caffeine can then be isolated by charcoal adsorption (as above) or by distillation, recrystallization, or reverse osmosis. [207]

About 1% of the caffeine you eat or drinks gets into your breastmilk. The caffeine level in your breastmilk usually peaks about one hour after eating or drinking it. When you drink alcohol with caffeine, the caffeine can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours. 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]The short-term effects of caffeine typically happen about 30 minutes after consumption. They can last up to 6 hours, depending on the individual. Until recently, the Seventh-day Adventist Church asked for its members to "abstain from caffeinated drinks", but has removed this from baptismal vows (while still recommending abstention as policy). [282] Some from these religions believe that one is not supposed to consume a non-medical, psychoactive substance, or believe that one is not supposed to consume a substance that is addictive. The Church of Jesus Christ of Latter-day Saints has said the following with regard to caffeinated beverages: "... the Church revelation spelling out health practices (Doctrine and Covenants 89) does not mention the use of caffeine. The Church's health guidelines prohibit alcoholic drinks, smoking or chewing of tobacco, and 'hot drinks' – taught by Church leaders to refer specifically to tea and coffee." [283] Whether caffeine also enhances creativity is a different question, however, and there’s some reason to doubt that it does. Caffeine improves our focus and ability to concentrate, which surely enhances linear and abstract thinking, but creativity works very differently. It may depend on the loss of a certain kind of focus, and the freedom to let the mind off the leash of linear thought.

Xocolatl was introduced to Europe by the Spaniards, and became a popular beverage by 1700. The Spaniards also introduced the cacao tree into the West Indies [252] and the Philippines. [253] Around noon, my compulsiveness began to subside, and I felt ready for a change of scene. I had yanked a few plants out of the vegetable garden that were not pulling their weight, and decided to go to the garden centre to buy some replacements. It was during the drive that I realised the true reason I was heading to this particular garden centre: it had this Airstream trailer parked out front that served really good espresso.Caffeine may be synthesized in the lab starting with dimethylurea and malonic acid. [ clarification needed] [200] [201] [205] A review noted that those who drink the most coffee have up to a 29% lower risk of developing type 2 diabetes. Similarly, those who consume the most caffeine have up to a 30% lower risk ( 36).