First Food Test Day (Duration is 7- 9 hours. You'll arrive after having fasted for 12 hrs.) For females, all test meal days will be scheduled during their luteal phase. • Breakfast: During your first food test day, you will be asked to come to the Pennington Center at any time between the hours of 7:00 A.M. - 8:30 A.M. and consume a standard breakfast of Cheerios, milk, orange juice, toast, butter, and jelly. You will then be free to leave but will be asked to return 3.5 hours later. When your return, you will be sent to our inpatient unit for a blood draw, which will test your level of insulin and glucose (total of 25 mL or 1.67 tablespoons). You will then be asked to rate your appetite on a computer using a visual analog scale (VAS). After completing these VAS ratings, you will be provided with an appetizer of 5 ounces of cold tea and 6 crackers with cream cheese. Both the tea and the cream cheese will be sweetened with one of the following sweeteners: Aspartame, Sucrose, or Stevia. After consuming this appetizer, you will be asked to complete another set of VAS ratings, which again ask you about your appetite, as well as the sweetness of the appetizer. Test times will be constant for all visits. Approximately twenty minutes after consuming this appetizer, your insulin and glucose levels will again be tested and you will complete another set of VAS ratings before your lunch meal. You will be required to consume breakfast at the same time for all three visits. For example, if you come at 7:00 A.M. on your first test day, you will be required to come in at 7:00 A.M. on your next two test days.