Poster Topical Area: Aging and Chronic Disease
Poster Board Number: 54
Objectives: Energy balance is critical for health and chronic disease prevention, and managing appetite and control of food intake are integral parts of this process. The purpose of this study was to evaluate the effects of watermelon consumption on satiety and postprandial glucose and insulin response. It was hypothesized that consumption of watermelon would improve postprandial glucose and insulin response and enhance satiety by modulation of satiety hormones compared to an isocaloric reduced fat cookie snack.
Methods: Thirty-three overweight or obese subjects (age 26.5 ± 13.3y, BMI 31.5 ± 0.6 kg/m2) participated in a crossover design with two trials examining the acute effects of watermelon (2 cups) and isocaloric reduced fat cookies (6 cookies) consumption on satiety, blood glucose, insulin and satiety hormones (leptin, ghrelin, adiponectin, cholecystokinin (CCK), and peptide YY (PYY)) following an overnight fast. Subjects were given a satiety questionnaire containing five questions: how hungry are you (Q1), how full are you (Q2), how strong is your desire to eat (Q3), how much do you think you could eat (Q4), and how thirsty are you (Q5). Answers were marked on a 10-cm line scale. Subjects were instructed to complete the questionnaire at baseline and 20, 40, 60, 90 and 120 minutes post snack consumption. Blood glucose, insulin, and satiety hormone levels were measured at 0 and 60 minutes post consumption.
Results: Both watermelon and cookie consumptions significantly increased satiety (P<0.001) with greater satiety in watermelon compared to cookies (P<0.05). Additionally, watermelon consumption trended towards increases in postprandial Adiponectin (p=0.088) and PYY (p=0.063) levels compared to baseline. There was no such trend with cookie consumption. Watermelon and cookie consumption caused a significant increase in blood insulin (P<0.001) at the 1-hour post consumption compared to baseline with no differences between the two trials. There was no difference in glucose levels between the two snacks
Conclusions: While both watermelon and cookies increased satiety following consumption, watermelon consumption was able to increase satiety and satiety hormone levels that may be beneficial in reducing overall food intake and preventing cardiovascular disease, diabetes, and weight gain.
Mee Young Hong
San Diego State University
San Diego, California