pleasant1911,
Sometimes, when you're sick, eating is a chore, not a pleasure, so you may need to explain to your father that he needs to eat to maintain or improve his health, like it or not. I know that sounds harsh but he might appreciate the honesty.
Meanwhile, of course, you'll want to look for ways to help him find foods he can most easily eat. Most major hospitals have nutritionists who may be able to help too.
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