It's frustrating when they decide they don't like, don't want, and won't. I had that with a family member and there was nothing really wrong other than a need for new teeth ("not needed at my age") so I cooked mashed potatoes, fixed ground meat of any kind, lots of jello, cottage chees, and just put it on the table. We all ate it and when one is hungery enough so will they. Just like little children.