 Subjects with diabetes will be requested to bring their own testing devices. The CTRC has their own testing devices if the subject forgets to bring his or her own. Subjects will be asked to check their blood sugar upon arrival at the CTRC. If they are unable to perform the measurement, the nurses will do so. The study physician will be informed of low less 100 mgdl or high greater than 200 blood sugars. Otherwise, the participant will follow their normal routine for checking blood sugar. For example, if they check after each meal, then they will be asked to do so. If they only check once a day, then they will not be asked to check again. Participants will be fed breakfast and lunch and therefore there is no concern for hypoglycemia over the course of the study visit. 