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J.Health Sci., 53(4), 475-480, 2007

Quantitative Assessment of Effective Energy of Resistant Cornstarch Using 13CO2, H2, and CH4 Breath Tests

Maki Kinoyama, Hayami Nitta, Yuko Hatase, and Akiharu Watanabe*

Department of Clinical Nutrition, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama 701-0193, Japan

We calculated the effective energy of a resistant cornstarch (HB-450) by using 13CO2, H2, and CH4 breath tests to assess HB-450 digestion and fermentation in healthy female subjects. On the basis of the areas under the curves (AUCs) for the concentrations of 13CO2 and H2 following ingestion of 40 g of HB-450, 23.0±6.8 g was digested in the upper digestive tract and 3.6±2.1 g was fermented by intestinal flora. The effective energy of the 40 g dose was thus calculated as 2.5±0.8 kcal/g. These results indicate that 13CO2, H2, and CH4 breath tests are useful for measuring the effective energy of resistant cornstarch.