Tiffany has a desire to eat a steak with a baked potato smothered with butter and sour cream. One component of her personality tells her that, because she is overweight, she should fast instead of eating the meal and direct her efforts to ending world hunger. Another component suggests that it would be better to eat a salad and a bran muffin, then run 2 miles. The fasting suggestion most likely was made by which component of personality?