Caffeinated drink

The most common naturally caffeinated beverages are coffee and tea, which in one form or another (usually served hot, but sometimes iced) feature in most world cultures.

Examples include the consumption of tea or coffee with breakfast in many westernized societies, in order to 'wake oneself up', or the deliberate consumption of energy drinks by students wishing to study through the night, or revellers seeking to maintain an alert attitude during social recreation.

[3] The need for caffeine can be identified when individuals feel headaches, fatigue and muscle pain 24 hours after their last energy drink.

[4] Some commercially distributed drinks contain guarana, a South American berry with a caffeine content about twice that of coffee beans.

[12] Caffeine is also a common ingredient of soft drinks, such as cola, originally prepared from kola nuts.

The caffeine in these drinks either originates from the ingredients used or is an additive derived from the product of decaffeination or from chemical synthesis.