This study will use scintigraphy techniques to measure gastric emptying rate of liquid and solid food at baseline and after administration of GSK716155 or placebo.

Inclusion Criteria:

• Healthy men or women, between the ages of 18 and 65, and have a Body Mass Index (BMI) of between 20 and 32.
• If female, the subject must be not be capable of having children.

Exclusion Criteria:

• Subjects must not use tobacco, nicotine, or illegal drugs of abuse, and must not take caffeine or alcohol for 24 hours before dosing and before each set of scintigraphy procedures.
• Subjects may not have HIV, hepatitis, elevated fasting blood sugar levels, high blood pressure, heart, lung, liver, gall bladder, gastrointestinal, pancreatic, or kidney disease, or untreated thyroid disease.
• Subjects must not have a history of alcohol abuse, must not take prescription or non-prescription drugs within 7 days of Day 1 and Day 8 of the study, and must not have previous exposure to any GLP-1 mimetic or exenatide.
• Prior radiation exposures must meet certain limits in order to participate in this study.

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.