Unfortunately some people do. A person I know has a room in his friends house, they both have type 2 diabetes. The friend needs a mobility scooter to get out and about, him and his wife go to Macdonalds KFC etc. The friend goes to hospital 3 times a week for kidney dialysis, he has to have hospital transport to get there, he has had toes removed and is obese and it looks like he may have to have his foot amputated. The wife brings home boxes of cakes and eats them all, husband eats about 3/4 of them. Dinner is served in a extra large bowl.
He also has a very ulcerated foot that needs dressing, but he refuses to go down to the surgery , he could go in his mobility scooter, so insists the nurses visit him in his home. He sleeps in the lounge and has a fridge next to him full of Coca Cola and other sugary items, he is just 50 years old.