This study examined how body composition, size, and age affect glucose regulation in fasting individuals. Blood glucose levels were measured for three subjects at intervals over 120 minutes. Subject 1 and the experimental subject had similar glucose levels initially, but Subject 1 did not regulate glucose as well later on. Subject 2 had high glucose at all readings, indicating poor regulation, and was the oldest with the highest BMI and waist-to-hip ratio. The results suggest body composition plays an important role in how well the body regulates glucose levels during fasting.