2006 Fiscal Year Final Research Report Summary
Role of salivary secretion in eating behavior and obesity
| Project/Area Number |
17500548
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Eating habits, studies on eating habits
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| Research Institution | Health Sciences University of Hokkaido |
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Principal Investigator |
KURAHASHI Masashi Health Sciences University of Hokkaido, School of Nursing and Social Services, Professor, 看護福祉学部, 教授 (40002224)
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| Project Period (FY) |
2005 – 2006
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| Keywords | chewing gum method / salivary flow rate / masticatory performance / masticatory movement / chew-and-spit method / eating behavior / obesity |
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| Research Abstract |
1. The relationship between salivary flow rate and masticatory performance during chewing of gum, and the effects of salivary flow rate on the masticatory performance during chewing of gum were studied by the advanced chewing-gum method. The significant positive correlation between the salivary flow rate and the masticatory performance was observed, suggesting that the salivary flow rate is related to the masticatory performance during chewing of gum in man.
2. Using the improved chew-and-spit method, the whole salivary flow rate, number of chewing for one mouthful, chewing time for one mouthful were determined during the feeding of two foods of different fat content. The whole salivary flow rate during feeding was not different between two foods of different fat content. The number of chewing for one mouthful was significantly les in the food of higher fat content, and the water content of food bolus was less in the food of higher fat content.
3. The whole salivary flow rate during feeding and water content of food bolus were determined by the improved chew- and-spit method. The masticatory movement was monitored by the digital video camera, and the number of chewing for one mouthful, the chewing time for one mouthful, chewing frequency were determined by analyzing the digitalized video recording. The daily eating behavior was asked by using the questionnaire, and BMI was estimated for obesity rates. The water content of food bolus was positively correlated with the whole salivary flow rate, and BMI was negatively correlated with the salivary flow rate. The results obtained in this study suggested that the decreased whole salivary flow rate might be one of the causes for obesity.
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