 - Mixed Meal Tolerance Test MMTT: The test includes placement of an intravenous IV line in the participants armhand to make taking the blood samples easier. With the IV in place, the participant will not need to be stuck again for any further blood draws, unless the IV stops working. If she prefers, a numbing cream can be placed on your skin for about 45 minutes before this test to numb the area. Once the IV is in place, the participant will receive a test shake. She will have about 30 minutes to finish the shake. Over the next 4 hours, blood will be drawn every 30 minutes from the IV line. The total amount of blood drawn for the MMTT will be a little less than 2 tablespoons. 