Four hours after breakfast a small amount of liquid to drink will be given to a participant that will contain either the Appethyl™ or placebo. You will be given a lunch of about 750 calories and 40% fat prepared by the Metabolic Kitchen and be asked to eat all of it. You will have food choice testing performed 4 hours after starting your lunch meal. This will be done in two ways. You will be given a list of two foods that are made of carbohydrate like bread and pretzels and be asked which you prefer most. You will also be given a list of foods that differ in the amounts of fat, carbohydrate and protein that they contain and you will be asked to mark the ones that appeal to you.