Visit 2 and 3: Following an overnight fast, the participant will be placed in a semi-supine position and a catheter will be placed in a vein in the antecubital space of one arm. A 9 ml baseline blood sample will be collected. Participants will complete a validated appetite questionnaire on a palm pilot right after the baseline blood draw. The participants will then consume 28 g of walnuts or 28 g walnut butter given in random order. Additional blood samples and appetite questionnaire will be taken at 15, 30, 45, 60,120, and 180 minutes. The blood will be stored in a minus 80 freezer to be analyzed at a later date for insulin, glucose, GLP-1, Ghrelin, and PYY.