The study by ROLLS et al. investigates the specificity of satiety in humans, focusing on how the pleasantness of food changes after consumption. In Experiment 1, 32 subjects rated the pleasantness of eight foods, consumed one food to satiety, and then re-rated the pleasantness of the same foods 2 and 20 minutes after the meal. The results showed that the pleasantness of the food eaten decreased more than that of the foods not eaten (p<0.001). In Experiment 2, 24 subjects rated the pleasantness of eight foods, consumed one food to satiety, and then were given an unexpected second course of either the same or different food. The changes in pleasantness for the food eaten were significantly greater than for the foods not eaten (p<0.001), and these changes were highly correlated with the amounts of the foods eaten in the second course. The findings suggest that satiety in humans is at least partly specific to the particular food consumed, influencing subsequent food intake. This specificity may play a role in selecting a varied diet and could have implications for understanding obesity.The study by ROLLS et al. investigates the specificity of satiety in humans, focusing on how the pleasantness of food changes after consumption. In Experiment 1, 32 subjects rated the pleasantness of eight foods, consumed one food to satiety, and then re-rated the pleasantness of the same foods 2 and 20 minutes after the meal. The results showed that the pleasantness of the food eaten decreased more than that of the foods not eaten (p<0.001). In Experiment 2, 24 subjects rated the pleasantness of eight foods, consumed one food to satiety, and then were given an unexpected second course of either the same or different food. The changes in pleasantness for the food eaten were significantly greater than for the foods not eaten (p<0.001), and these changes were highly correlated with the amounts of the foods eaten in the second course. The findings suggest that satiety in humans is at least partly specific to the particular food consumed, influencing subsequent food intake. This specificity may play a role in selecting a varied diet and could have implications for understanding obesity.