Caffeine is a stimulant that increases the activity of your nervous system. According to Harvard University, “caffeine is naturally found in the fruit, leaves, and beans of coffee, cacao, and guarana plants. It is also added to beverages and supplements. There is a risk of drinking excess amounts of caffeinated beverages like colas and energy drinks because they are taken chilled and are easy to digest quickly in large quantities.”
The main sources of caffeine consumption are coffee, tea, cola, energy drinks, chocolates, Guarana (a south american plant that is processed as an extract in foods, energy drinks, and energy supplements), Kola nut (seed of kola tree, found in West Africa used as flavouring agent), and various dietary supplements.
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