Gluttony, bad education, and laziness.  Everything has to have cheese now, every thing has to be large, and everything has to be covered in ranch dressing, because the average person can't taste anything else.  the bad education part, is scary. I remember they told us in elementary school, that ice cream counted as dairy for the food pyramid. it was not until i went to japan as an adult that i finally understood how stupid that was. So fat logic, was being taught in some schools systems, and now we are seeing the results of that.