Your favorite substance, further demystified inside…

1-Caffeine Consumption

Global consumption has been estimated to be 120,000 tonnes per annum. This is the approximate equivalent of one caffeine-containing beverage per day for each of the planet’s 5 billion plus inhabitants. So, caffeine is almost certainly the most widely consumed psycho-active substance in the world.

As a beverage the worldwide consumption of tea is surpassed only by water.  Most caffeine is drank in

2-Where Caffeine Came From

The coffee “tree” is indigenous to Ethiopia, but its cultivation and use as a beverage stem largely from Arabia. In Arabic it was referred to as gahwah, the poetic term for wine. The Turkish equivalent is kahveh, which became cafe in French and kaffee in German.

Apparently the Ethiopians mixed crushed dried coffee beans with fat which they rolled into balls and used as food on journeys. By the early 16th century the beverage made from infusing ground roasted beans was well-established in the Islamic world, although a fundamentalist element felt that coffee was an intoxicant and it was banned for a time in several places.

Coffee shops sprang up throughout Europe – coffee was the fashionable drug of the 17th and 18th centuries; its delights, and the cravings for it, were the subject of J.S. Bach’s “The Coffee Cantata”.

The British were the first to tax coffee; in 1660 a duty of 4 pence per gallon was imposed. The popularity of coffee lead to anti-coffee petitions such as “What a curse it is that ordinary working men should sit the whole day in coffee houses simply to chatter about politics, while their unhappy children are wailing at home for lack of bread!”

It’s been suggested that America owes its present day coffee habits to the famous Boston “tea-party” of 1773. As a protest against oppression and excessive taxes, citizens of Boston boarded British ships moored in the Harbour and tipped their cargoes of tea overboard. Since that time, the United States has become the major coffee-consuming nation of the world.

3-How much Caffeine is in popular drinks and foods?

It’s usually presumed that a regular cup of coffee contains 100mg of caffeine but it may range between 40 and 176 mg and the mean is closer to 85mg. There’s probably less caffeine in a cup of tea – one study showed a median of 27mg per cup with a range of 8 to 91 mg. An ounce of sweet chocolate may contain between 75 and 150mg of combined methylxanthines and a cup of chocolate or chocolate milk may contain 150-300mg.

The principal dietary sources of caffeine are overwhelmingly coffee and tea. Coffee accounts for some 54 per cent of ingested caffeine, while tea accounts for some 43 per cent. The remaining 3% consists mostly of caffeine ingested in the form of cocoa and chocolate products, various fabricated soft drinks and mate (a tea drunk especially in South America).

In Australia a 375ml can of Coca Cola and Pepsi Cola contains about 40mg of caffeine. Regulations allow a maximum of 145mg of caffeine per kilogram of cola-type drink (54.5mg per 375ml can). “Jolt” Cola – said to have “twice the caffeine” – actually contains the permissible legal limit of around 54mg per bottle.

In the USA, the permissible limit of caffeine in cola drinks and other carbonated beverages is 200mg per litre. The US drinks also have higher levels of sugar. Caffeine’s bitter taste acts as a flavouring agent to counteract the sweetness of the sugar.

4-Caffeine and Alertness

Too much caffeine may not be good for complex reasoning tasks, but it can improve mental speed-related tasks. These are some of the results of research by Dr Paula Mitchell, now working at the Alfred Hospital in Melbourne.

In 1989 Paula carried out a study which looked at 3 groups of volunteers (around 8 people in each group) divided into low, moderate and high caffeine users. The volunteers visited the lab 8 times at different times of day and night (7am, 1pm, 7pm and 1am). Before the tests began they swallowed either a caffeine capsule or a placebo capsule. In the lab they were given a series of performance tests covering short term memory, mental arithmetic, verbal reasoning (which is like logic), and a serial search task (which is a measure of vigilance).

Caffeine actually improved performance in more simple mental tasks like searching for one particular letter in a string of printed letters. Mental speed is the critical thing in this test.  Caffeine improved performance best at the 7am testing time – when the body’s 24 hour rhythm of arousal is at its lowest.  By contrast Mitchell found that the high-caffeine user group didn’t perform as well as the others on more complex tasks such as verbal reasoning.

There you have it, Caffeine improves your video game skills.  End of story.

5-Caffinated Beverages Will Help You Pass A Breathalyzer

I kid, they will do no such thing.  Unfortunately, this is one of the most enduring myths about caffeine. True, it may manage to puncture that aura of numbness and make you feel a little sharper but it’s no better at sobering you up and lowering your blood alcohol level than a glass of water.

On the other hand caffeine is a good friend the morning after. Alcohol can give you a thumping headache by enlarging cranial blood vessels. Caffeine constricts them and so may bring some relief from the hangover blues. That’s why it’s an ingredient in some over-the-counter pain killers.