Inclusion Criteria:  Are older than 17 and under 50 years of age Self-report of good health  Exclusion Criteria:  Using any prescription medication including birth control Report hypersensitivity to caffeine Have visual impairment that cannot be corrected with glasses or contact lenses Report any food allergies Self-reported excessive leisure time physical activity (> 7 strenuous bouts per week) the presence of current gastrointestinal, sleep, or psychiatric disorder, Report pregnancy/lactation, illegal drug use, smoker failure to demonstrate adequate minimal performance on lab, computer-based cognitive tasks. Participation in another clinical trial within past 30 days