We took Elmo to his Vet and he has to loose weight, he is really Fluffy, I do not call him fat, he is Fluffy. The Vet wants to put him on Science Diet Metabolic, this has corn and corn gluten in it. He has been on Fromm for soon to be 4 years. Should I switch him to this for him to loose weight? I need advise on what to do for my Elmo Boy. Thank You, Love and Hugs To All Of You and Your Beautiful Bullies.