Is OTHER wrong in the post ? POST : My father has eaten his whole life too much which is the reason why he has always been overweight. My grandmother didn't really know what eating normally was due to the fact that she has experienced food scarcity in WWII. She didn't want her children (my father, aunt and uncle) to live in the same conditions as she used to, so she let them eat as much as they could throughout their whole childhood. About ten years ago, my dad's doctor confirmed that he has type 2 diabetes which, at that time, seemed to deeply affect his mood. For example, he became upset when a family member told him he couldn't eat ice cream. Many family members confronted him and told him he should eat healthier, by which he starts to play the victim and saying things like "you don't know what it's like to have diabetes". His reaction confused me, because he already knew his health was in bad shape and he acted like it was some sort of joke at first. 

In the past, he followed harmful diets that made him lose and gain weight quickly, like juice cleanses. He says it's difficult to lose weight and I don't doubt that, but to me and my family it seems like he's barely trying to improve his lifestyle. He follows a diet that his doctor recommended to him due to his health condition, but eating custard and so-called healthy cookies after dinner? That doesn't sound like something a doctor would recommend to someone with diabetes. He walks an hour a day, yet he eats junk food at work (not everyday, fortunately). My mother can tell this by his expenses that she can search on his bank account. I don't know exactly how much he eats, but I can tell he doesn't know what eating normally is.  

My family and I are at our wit's end on how to improve his health. I'm worried he might get a heart attack one day and I don't know what I could say or do to make him eat normally, because he's quite stubborn about this topic. Whenever he asks for candy and such, I want to say 'no'.

WIBTA to tell him to eat healthy?