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Do you drink coffee? I occasionally drink coffee because the caffeine is a great stimulant, 
Coffee is slightly acidic and has a stimulating effect on humans because of its caffeine content.
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Coffee
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List of coffee drinks
Coffee drinks are made by brewing hot water (or much less commonly, cold water) with ground coffee beans. The brewing is either done slowly by drip or filter, French press or "cafetière", percolator, etc., or done very quickly under pressure by an espresso machine, where the coffee is termed "espresso"—slow-brewed coffees are generally regarded simply as "coffee". All coffee drinks are based on either coffee or espresso, in different strengths; some drinks have milk or cream added, some use steamed milk, cream, plant based milk, or foamed milk, some have flavorings or sweeteners, some have alcoholic liqueurs added, some are combinations of coffee with espresso or tea.
Caffeine
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. There are several known mechanisms of action to explain the effects of caffeine. The most prominent is that it reversibly blocks the action of adenosine on its receptor and consequently prevents the onset of drowsiness induced by adenosine. Caffeine also stimulates certain portions of the autonomic nervous system. 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).
Coffee
Coffee is a brewed drink prepared from roasted coffee beans, which are the seeds of berries from the "Coffea" plant. The genus "Coffea" is native to tropical Africa (specifically having its origin in Ethiopia and Sudan) and Madagascar, the Comoros, Mauritius, and Réunion in the Indian Ocean. The plant was exported from Africa to countries around the world. Coffee plants are now cultivated in over 70 countries, primarily in the equatorial regions of the Americas, Southeast Asia, India, and Africa. The two most commonly grown are the highly regarded arabica, and the less sophisticated but stronger and hardier robusta.
Energy drink
An energy drink is a type of beverage containing stimulant drugs, usually including caffeine, which is marketed as providing mental and physical stimulation (marketed as "energy", but distinct from food energy). They may or may not be carbonated and many also contain sugar or other sweeteners, herbal extracts, taurine, and amino acids. They are a subset of the larger group of energy products, which includes bars and gels, and distinct from sports drinks, which are advertised to enhance sports performance. There are many brands and varieties of energy drinks. Coffee, tea and other naturally caffeinated beverages are usually not considered energy drinks.
Breakfast
Breakfast is the first meal of a day, most often eaten in the early morning before undertaking the day's work. The word in English refers to breaking the fasting period of the prior night. There is a strong tendency for one or more "typical", or "traditional", breakfast menus to exist in most places, but the composition of this varies widely from place to place, and has varied over time, so that globally a very wide range of preparations and ingredients are now associated with breakfast. The Old English word for dinner, "disner", means to break a fast, and was the first meal eaten in the day until its meaning shifted in the mid-13th century.
Stimulant
Stimulants (also often referred to as psychostimulants or colloquially as uppers) is an overarching term that covers many drugs including those that increase activity of the body, drugs that are pleasurable and invigorating, or drugs that have sympathomimetic effects. Stimulants are widely used throughout the world as prescription medicines as well as without a prescription (either legally or illicitly) as performance-enhancing or recreational drugs. The most frequently prescribed stimulants as of 2013 were lisdexamfetamine, methylphenidate, and amphetamine. It is estimated that the percentage of the population that has abused amphetamine-type stimulants (e.g., amphetamine, methamphetamine, MDMA, etc.)
Decaffeination
Decaffeination is the removal of caffeine from coffee beans, cocoa, tea leaves, and other caffeine-containing materials. While soft drinks which do not use caffeine as an ingredient are sometimes described as "decaffeinated", they are better termed "non-caffeinated" because decaffeinated implies that there was caffeine present at one point in time. Decaffeinated drinks contain typically 1–2% of the original caffeine content, and sometimes as much as 20%. Decaffeinated products are commonly termed decaf. Friedlieb Ferdinand Runge performed the first isolation of pure caffeine from coffee beans in 1820.