Reinforcing effects of caffeine and theobromine as found in chocolate
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Although in a previous study we showed that caffeine and theobromine were the main psychopharmacologically active constituents in a 50-g bar of chocolate, mere activity does not guarantee a role in our liking for the food.
Our aim was to see if liking for a drink repeatedly paired with these amounts of caffeine and theobromine would increase compared to a placebo-paired drink.
Participants (n=64) consumed a ‘novel’ drink + treatment capsule on six non-consecutive mornings using a double-blind, placebo-controlled independent-sample design. Aspects of liking and intensity of various sensory descriptors for these drinks were measured at every drink collection. Treatment capsules contained either an ecologically relevant dose combination of 19-mg caffeine and 250-mg theobromine or a placebo.
Liking for the drink paired with the methylxanthine-containing capsules increased over time compared to the placebo-paired drink. This highly significant effect was confirmed by subjective, retrospective changes in liking for the drink.
Methylxanthines in amounts found in 50-g chocolate may well contribute to our liking for chocolate, especially to the more acquired taste for dark chocolate.
KeywordsChocolate Cocoa Caffeine Theobromine Flavour preference conditioning
A summary of these results was presented as a poster at the annual meeting of the British Feeding and Drinking Group in Bristol, UK, on 25–26 March 2004 (Smit and Blackburn 2004). The authors would like to thank Capsugel and FMC for donating the relevant materials for this study.
- Desor JA, Maller O, Greene LS (1977) Preference for sweet in humans: infants, children, and adults. In: Weiffenbach JM (ed) Taste and development: the genesis of sweet preference. U.S. Dept. of Health, Education and Welfare, Bethesda, MD, USA, pp 161–172Google Scholar
- Hamilton S (1992) Why the lady loves C6H5(CH2)2NH2. New Sci 132:26–28Google Scholar
- James JE (1991) Caffeine and health. Academic Press, LondonGoogle Scholar
- James JE (1997) Understanding caffeine: a biobehavioral analysis. Sage Publications Ltd, LondonGoogle Scholar
- Liebowitz MR, Klein DF (1979) Hysteroid dysphoria. Psychiatr Clin North Am 2:555–575Google Scholar
- MAFF (1998) Survey of caffeine and other methylxanthines in energy drinks and other caffeine-containing products (updated). Food Surveillance Information Sheet 144Google Scholar
- Mela D (1992) The perception and acceptance of dietary fat: What, Who, Why? Tomorrow’s Nutr 17(Suppl 1):74–86Google Scholar
- Pavlov IP (1928) Lectures on conditioned reflexes. Lawrence and Wishart, LondonGoogle Scholar
- Scholey AB, Chandler C, Wesnes K (2000) Interactions between actual and informed caffeine content on subsequent cognitive performance. Proc Br Psychol Soc 8:45Google Scholar
- Smit HJ, Rogers PJ (2001) Potentially psychoactive constituents of cocoa-containing products. In: Hetherington MM (ed) Food cravings and addiction. Leatherhead Food RA Publishing, Leatherhead, pp 325–349Google Scholar
- Smit HJ, Rogers PJ (2002b) Effects of caffeine on mood. Pharmacopsychoecologia 15:231–258Google Scholar
- Steiner JE (1977) Facial expressions of the neonate infant indicating the hedonics of food-related chemical stimuli. In: Weiffenbach JM (ed) Taste and development: the genesis of sweet preference. U.S. Dept. of Health, Education and Welfare, Bethesda, MD, USA, pp 173–189Google Scholar