Human hedonic responses to sweetness: role of taste genetics and anatomy

While past research has suggested an association between the ability to taste PROP and liking for the taste of sucrose, many aspects of this relationship remain ambiguous. To clarify this further, 60 volunteers (40 women and 20 men) were classified as PROP super-medium or non-tasters and as sweet likers or dislikers depending on hedonic and intensity ratings for PROP and sucrose. 67% of PROP super-tasters were sweet dislikers, compared to 12% of PROP non-tasters. PROP super-tasters also rated the intensity of salty and sweet tastes as greater than did non- or medium PROP tasters, but these differences in sweet intensity could not explain the group differences in sweet liking. The groups did not differ in restraint or BMI. Taste bud density was higher in PROP super-tasters and sweet dislikers than in PROP medium or non-tasters or sweet likers. Overall these data confirm that PROP super-tasters are more likely to be sweet dislikers, and that this cannot be explained as secondary to cognitive attitudes to sweetness (restraint) or enhanced sweet intensity.