This is because caffeine is metabolised in the liver. Caffeine can accumulate in individuals with severe liver disease, increasing its half-life up to 96 hours. In women taking oral contraceptives, this is increased to 5-10 hours, and in pregnant women the half-life is roughly 9-11 hours. In healthy adults, caffeine\’s half-life (the time taken to remove half of the caffeine in your system) is approximately 4.9 hours.
There is great variability though in how caffeine affects people and of course children metabolise it less efficiently. It binds to adenosine receptors in the brain and starts to take effect within an hour with the effects lasting for 3-4 hours. We know that caffeine is a central nervous system stimulant. This adds impetus to the need to discover how caffeine affects human function. This is due largely to the proliferation in energy drinks in the market but also to soft drinks, chocolate and good old tea and coffee. This adds extra meaning to the findings of a new study that shows caffeine has definite physical and psychological effects.Įstimations are that since 1977 there has been a 77 per cent increase in the amount of caffeine consumed by teens and even children. Global consumption of caffeine has been estimated at 120,000 tonnes per year and the trend is increasing, especially among teenagers. Approximately 90 per cent of all adults today consume caffeine in their daily diet.
Caffeine is the most socially accepted stimulant in the world and in the history of the world.
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