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Saliva Secretion as Indicator of Appetite

This study aims to investigate how the appetite as perceived by subjects may be estimated by physiological responses such as saliva secretion or pupillary response when they are presented visual stimuli. We recruited nine healthy male and female subjects to observe the changes in saliva secretion and pupil diameter before and after visual stimuli that arouse appetite. We also examined the relationship between these changes and subjects' evaluations of appetite. We found a significant difference in blood flow in the parotid region between the low-rating group and the high-rating group concerning their own appetite. Our findings suggest that salivary secretion may be useful in estimating and assessing appetite.