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Physiological effects of caffeine consumption

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2026-09-21 06:28 UTC → 2026-09-23 23:09 UTC · added ~~removed~~

Research into caffeine consumption highlights how individual metabolism and reduction strategies affect human physiology. Individual responses to caffeine are largely determined by how the body metabolizes the substance, specifically through the CYP1A2 gene which controls the liver enzyme responsible for decomposition. This genetic variation allows for the categorization of individuals as ‘fast’ or ‘slow’ metabolizers. The process of breaking down and eliminating caffeine can last between six and 20 hours. Factors such as smoking can accelerate ~~elimination,~~ elimination by up to 65%, while ~~pregnancy or~~ pregnancy, certain ~~medications~~ antibiotics, oral contraceptives, and age can prolong its effects. Caffeine functions by masking fatigue through the blocking of ~~adenosine rather~~ adenosine—a compound in the brain that signals sleepiness—rather than providing actual energy. By interfering with adenosine receptors, caffeine temporarily increases alertness and concentration. However, regular consumers may develop a tolerance, and those consuming caffeine late in the day may experience anxiety or sleep disruption due to accumulated levels. When individuals reduce or cease caffeine intake, they may experience withdrawal symptoms including headaches, fatigue, and irritability. ~~However,~~ Conversely, long-term reduction can lead to physiological benefits, such as improved sleep quality, decreased blood pressure, and reduced heart rate. Health organizations, such as the NHS, recommend specific limits for certain groups, including pregnant women, to avoid complications.

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