Every year, 400 billion cups of the beverage are drunk by people seeking a caffeine fix. Others prefer caffeinated tea or soft drinks for the same reason – to attain a heightened state of alertness. Ironically, the cup we drink to refresh ourselves when our energies flag is an alkaloid produced by plants to put to sleep insects that have designs on their seeds. In other words, we are addicted to an insecticide that evolved to paralyze and kill.
