Most people believe that a cup of coffee in the morning helps them boost their mental performance all day.
But a new study by the University of East London has suggested that the stimulating effect of the coffee may be all in the mind.
The British researchers studied 88 volunteers aged between 18 and 47 who were self-confessed coffee lovers, downing at least two cups every day.
Some were given caffeinated coffee and told it was decaffeinated. Others were given decaffeinated but were told it contained caffeine.
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