Energy Drinks: Beverages consumed as stimulants and tonics. They usually contain a combination of CAFFEINE with other substances such as herbal supplements; VITAMINS; AMINO ACIDS; and sugar or sugar derivatives.Beverages: Liquids that are suitable for drinking. (From Merriam Webster Collegiate Dictionary, 10th ed)Paullinia: A plant genus of the family SAPINDACEAE. The seed of P. cupana is the source of guarana powder which contains 4% CAFFEINE.Carbonated Beverages: Drinkable liquids combined with or impregnated with carbon dioxide.Caffeine: A methylxanthine naturally occurring in some beverages and also used as a pharmacological agent. Caffeine's most notable pharmacological effect is as a central nervous system stimulant, increasing alertness and producing agitation. It also relaxes SMOOTH MUSCLE, stimulates CARDIAC MUSCLE, stimulates DIURESIS, and appears to be useful in the treatment of some types of headache. Several cellular actions of caffeine have been observed, but it is not entirely clear how each contributes to its pharmacological profile. Among the most important are inhibition of cyclic nucleotide PHOSPHODIESTERASES, antagonism of ADENOSINE RECEPTORS, and modulation of intracellular calcium handling.Alcoholic Beverages: Drinkable liquids containing ETHANOL.Energy Metabolism: The chemical reactions involved in the production and utilization of various forms of energy in cells.Refractory Period, Psychological: A delayed response interval occurring when two stimuli are presented in close succession.Central Nervous System Stimulants: A loosely defined group of drugs that tend to increase behavioral alertness, agitation, or excitation. They work by a variety of mechanisms, but usually not by direct excitation of neurons. The many drugs that have such actions as side effects to their main therapeutic use are not included here.Alcoholic Intoxication: An acute brain syndrome which results from the excessive ingestion of ETHANOL or ALCOHOLIC BEVERAGES.Automobile Driver Examination: Government required written and driving test given to individuals prior to obtaining an operator's license.Alcohol Drinking: Behaviors associated with the ingesting of alcoholic beverages, including social drinking.Statistical Distributions: The complete summaries of the frequencies of the values or categories of a measurement made on a group of items, a population, or other collection of data. The distribution tells either how many or what proportion of the group was found to have each value (or each range of values) out of all the possible values that the quantitative measure can have.Binge Drinking: Drinking an excessive amount of ALCOHOLIC BEVERAGES in a short period of time.Universities: Educational institutions providing facilities for teaching and research and authorized to grant academic degrees.Energy Intake: Total number of calories taken in daily whether ingested or by parenteral routes.Behavior Control: Manipulation of the behavior of persons or animals by biomedical, physical, psychological, or social means, including for nontherapeutic reasons.Athletic Performance: Carrying out of specific physical routines or procedures by one who is trained or skilled in physical activity. Performance is influenced by a combination of physiological, psychological, and socio-cultural factors.Students: Individuals enrolled in a school or formal educational program.Social Problems: Situations affecting a significant number of people, that are believed to be sources of difficulty or threaten the stability of the community, and that require programs of amelioration.Ethanol: A clear, colorless liquid rapidly absorbed from the gastrointestinal tract and distributed throughout the body. It has bactericidal activity and is used often as a topical disinfectant. It is widely used as a solvent and preservative in pharmaceutical preparations as well as serving as the primary ingredient in ALCOHOLIC BEVERAGES.Water Loss, Insensible: Loss of water by diffusion through the skin and by evaporation from the respiratory tract.Drinking Behavior: Behaviors associated with the ingesting of water and other liquids; includes rhythmic patterns of drinking (time intervals - onset and duration), frequency and satiety.Energy Transfer: The transfer of energy of a given form among different scales of motion. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed). It includes the transfer of kinetic energy and the transfer of chemical energy. The transfer of chemical energy from one molecule to another depends on proximity of molecules so it is often used as in techniques to measure distance such as the use of FORSTER RESONANCE ENERGY TRANSFER.Drinking: The consumption of liquids.AfghanistanSweat: The fluid excreted by the SWEAT GLANDS. It consists of water containing sodium chloride, phosphate, urea, ammonia, and other waste products.