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Caffeine is a xanthine alkaloid which is found in a number of plants such as tea and coffee,
which is our primary dietary source.
Caffeine's primary action in the body is inhibiting the action of the neurotransmitter
adenosine in the brain. By doing this, caffeine prevents us feeling tired and promotes alertness.
To a lesser extent, caffeine can also stimulate the production of the neurotransmitters dopamine,
acetylcholine and serotonin, which can improve mood and protect the brain from neurodegenerative
diseases.
Caffeine may be able to prevent the development of type 2 diabetes and reduce the risk of
certain cancers. It is also a strong anti-oxidant and so can protect the body from radical damage.
Caffeine can cause a mild and short term increase in blood pressure and cause the "jitters",
this poses no health risk.
Caffeine addiction can occur from as little as 100mg a day, but can vary dramatically
from person to person.
Large amounts of caffeine have been shown to cause anxiety and nervousness for some
people, so recognising your tolerance levels is important.
For more information on caffeine please visit the link in the description.