Gustav III of Sweden's coffee experiment

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Gustav III of Sweden (1746–1792) was determined to prove the negative health effects of coffee.

Gustav III of Sweden's coffee experiment was a purported twin study ordered by the king to study the health effects of coffee. The authenticity of the event has been questioned.[1] The experiment, supposedly conducted in the second half of the 18th century, failed to prove that coffee was a dangerous beverage.


Coffee first arrived in Sweden around 1674,[1] but was little used until the turn of the 18th century when it became fashionable among the wealthy.[2][3] In 1746, a royal edict was issued against coffee and tea due to "the misuse and excesses of tea and coffee drinking".[2] Heavy taxes were levied on consumption, and failure to pay the tax on the substance resulted in fines and confiscation of cups and dishes.[2] Later, coffee was banned completely; despite the ban, consumption continued.[2]

Gustav III, who viewed coffee consumption as a threat to the public health and was determined to prove its negative health effects, ordered a scientific experiment to be carried out.[3]

The experiment[edit]

The king ordered the experiment to be conducted using two identical twins. Both of the twins had been tried for the crimes they had committed and condemned to death. Their sentences were commuted to life imprisonment on the condition that one of the twins drink three pots[1] of coffee, and the other drink the same amount of tea, every day for the rest of their lives.[4]

Two physicians were appointed to supervise the experiment and report its finding to the king.[5] Unfortunately, both doctors died, presumably of natural causes, before the experiment was completed.[4] Gustav III, who was assassinated in 1792, also died before seeing the final results. Of the twins, the tea drinker was the first to die, at age 83; it is unknown when the coffee drinker died.[6]


In 1794, the government once again tried to impose a ban on coffee. The ban, which was renewed multiple times until the 1820s, was never successful in stamping out coffee-drinking.[2] Once the ban was lifted, coffee became a dominant beverage in Sweden, which since has been one of the countries with the highest coffee consumption per capita in the world.[4]

The experiment has jokingly been called "the first Swedish clinical trial".[1]

See also[edit]


  1. ^ a b c d "Coffee – rat poison or miracle medicine?". Uppsala University. Retrieved 6 February 2012.
  2. ^ a b c d e Weinberg, Bennett Alan; Bealer, Bonnie K. (2001). The world of caffeine: the science and culture of the world's most popular drug. Psychology Press. pp. 92–3. ISBN 978-0-415-92722-2. Retrieved 9 February 2012.
  3. ^ a b Sempler, Kaianders (15 March 2006). "Gustav IIIs odödliga kaffeexperiment" [Gustav III's immortal coffee experiment] (in Swedish). Ny Teknik. Retrieved 6 February 2012.
  4. ^ a b c Crozier, Alan; Ashihara, Hiroshi; Tomás-Barbéran, Francisco (26 September 2011). Teas, Cocoa and Coffee: Plant Secondary Metabolites and Health. John Wiley & Sons. p. 21. ISBN 978-1-4443-4706-7. Retrieved 9 February 2012.
  5. ^ Halevy, Alon Y. (2011-12-08). The Infinite Emotions of Coffee. Macchiatone Communications. p. 77. ISBN 978-0-9847715-1-6. Retrieved 9 February 2012.
  6. ^ Herrmann, Sebastian (11 March 2006). "Die Wunderbohne" [The amazing bean]. Spiegel Online (in German). Retrieved 6 February 2012.