2.5. Test Foods and Dietary Surveys
One package of the test food contained a total of 3 g of long-chain triglyceride (LCT) (Nisshin Canola Oil; The Nisshin OilliO Group, Ltd., Tokyo, Japan) or/and MCT (Nissin MCT Oil, Nissin MCT-C10R; The Nisshin OilliO Group). From the 0-week test day until the day before the 12-week test, two packets of test food were administered daily, comprising one packet after two meals among breakfast, lunch, or dinner, for a total of two packets per day. The subjects in each group were administered one of the following test foods as their experimental food: control food, decanoic acid food, low-dose octanoic acid food, or high-dose octanoic acid food. The amounts of LCT, MCT, and MCFA in MCT per 6 g of fat in the test foods consumed per day are shown in During the 12-week intervention period, dietary surveys were conducted at baseline, and at 4, 8, and 12 weeks after intervention. Surveys were carried out using a simplified self-administered dietary history questionnaire (brief-type self-administered diet history questionnaire: BDHQ) from which nutrient intakes were calculated.