I underwent chemo before my unsuccessful whipple and lost my appetite and went from 145 to 110. Finishing my 25th radiation dose at Sloan Kettering with Dr. Crane. Loss of appetite again. I have found Kate Farms protein shakes a savior. Pricey but taste ok. I also use medical grade protein powder from my integrative doctor. And have gained a little weight back. Doc said in about two weeks the affects of radiation should pass and I will gain. I also take Creon but never sure how much. Hang in there.