•  Caffeine is the most consumed stimulant in the world. It is consumed in the form of coffee and tea.
  • At present there is no scientific data for promoting or discouraging coffee and/or tea consumption in the daily diet.
  • Short term benefits include mental alertness and improved athletic performance.
  • Short–term adverse effects including headache, anxiety, tremors and insomnia.
  • Long–term adverse affects include generalized anxiety disorder and substance abuse disorders.
  • Long–term benefits are dose–dependent. Caffeine is associated with a reduced risk of Parkinson’s disease, Alzheimer’s disease, alcoholic cirrhosis and gout. Coffee, both caffeinated and decaffeinated, is also associated with a lower risk of type 2 diabetes.
  • Heavy coffee intake may trigger coronary and arrhythmic events in susceptible individuals, although coffee intake is not considered a long–term risk factor for myocardial disease.
  • Most studies show a modest inverse relationship between coffee consumption and all–cause mortality.
  • Caffeine withdrawal is a well–documented clinical syndrome with headache being the most common symptom. (Source: Uptodate)
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