PURPOSE OF THE STUDY AND PROCEDURE
This study evaluates the effects of barley beta –glucan (β-glucan) on short -term glycemic control and appetite, and aims to characterize the potential of low vs. medium vs. high β -glucan barley to attenuate glycemic response to a high-glycemic index food.
Location: The study will be held throughout the fall of 2019 at the Washington State University’s Elson S. Floyd College of Medicine Campus in Spokane, Washington.
Time slot: 7:45 am to 12:30 pm (5 hrs), ONE day a week on Mon, Tues, Weds, Thurs, or Friday for four or eight weeks (total 4-8 days) out of a 4-8 week study.
Duration: The full trial is 8 weeks, but participants may attend for only the first four or last four weeks.
During this study, participants will be asked to attend four or eight half-day testing sessions in our lab. These testing sessions will occur during weeks 1 through 8. At each visit, participants will arrive at the laboratory just before 7:45 am after an overnight (10-12 hr.) fast and be seated.
At 8:00 am, participants will conduct a finger prick with a glucometer and be asked to complete an initial questionnaire to assess their feelings of hunger and satiety using computerized Visual Analogue Scales (VAS). Immediately following that assessment, participants will receive a breakfast porridge made of either barley or rice with or without corn syrup and 12 fl oz of water. Participants will be asked to consume all of the food and drink provided at breakfast.
From 8:00 to 12:00 participants will conduct a finger prick at 15 min intervals and fill out the VAS. Lunch will be served after the final assessment at 12:00 pm, and participants may choose what and how much to eat from a tray. At 12:30 pm, participants will be free to leave the laboratory.
Sessions take place in a quiet room on campus where one can study, read, access a wireless network or listen to music with headphones.