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Why is Coffee so Irresistable? The Chemistry of STARBUCKS®

Many people are openly addicted to coffee. In northern Europe, home of the world’s greatest coffee drinkers, annual coffee bean consumption hovers around 9 kg per capita, which equates to 400 mg of caffeine per person per day (this is a highly addictive, highly stimulating dose). In North America, coffee bean consumption is much lower at 4.2 kg per capita per year, which equates to 185 mg of caffeine per person per day. However, this is still a highly addictive dose.

Chemistry of STARBUCKS jameskennedymonash

Caffeine (around 225 mg in the beverage shown above) causes short, sharp increases in your blood pressure. It makes you feel alert, but jittery in large doses. Caffeine stimulates nerves by counteracting adenosine, which is a nerve activity suppressant. The brain develops a tolerance to caffeine intake after a few weeks, which can cause some people to take increasingly large doses—sometimes exceeding the ~300 mg per day limit recommended by many doctors. That said, smaller doses are believed to provide some protection against Parkinson’s Disease in the long term.

Milk, a butterfat emulsion, gives the coffee its light colour and pleasant mouthfeel. Vanilla syrup adds an interesting flavour and aroma, and consists of glucose syrup and vanillin, an artificial flavour compound modelled on the main aroma compound in real vanilla beans.

The most amazing aspect of the product shown is the polypropylene cup. Starbucks® sells these reusable cups for just $1 in its United States stores, which is part of an attempt to serve 5% of all its beverages in reusable containers by 2015. In addition to giving you a 10-cent discount for bringing your own cup, and selling these reusable cups ridiculously cheaply, Starbucks® makes these cups from a fully recyclable plastic that’s completely inert at boiling-hot temperatures (100°C). This ensures that absolutely nothing from the cup leeches into your piping hot drink before you drink it. ●