Hi Mollie,I think Margro will be able to give you good advice, but I do know that eating can become a bit of a chore after a whipple operation. Your sense of taste can change and foods can begin to taste metallic or just different and unpleasant. Try adding flavours to food like salt, garlic, cheese, spices, chutneys, pickles, sugar ... experiment till you find something your Dad likes. Lots of smaller meals are probably the go too. Has your Dad tried nutrition supplement powders like sustagen? These don't replace meals but can sometimes help people regain weight.