What to do with a sttuborn old man?

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Mt geamp's has arrived at his 70's and has falling ill a lot of times already. We need to get him to the hospital at least once in a month. As soon as he gets home, he starts acting exactly the opposite as the doctor says him to. He does not listen to advices and keeps on eating foods which are stricktly forbiden by his doctor. Have you ever faced a similar situation/ How do you handle things? Sometimes I like tying him down...