OY my family is so like that too. I am challenged to find something healthy they eat...the attitude I get when I explain why my kids aren't eating the same things as them is "well everything gives you cancer, and you gotta die from something". They think I am being MEAN by not letting my kids devour Sugar and fast food. Its crazy.
You wouldn't believe me if I told you how my husband's family eats, or mine for that matter. Its unbelievable they are still alive. But most of them have various health problems but refuse to see the connection to how they eat and drink. My brothers drink nothing but alcohol and pop (soda to you non mid-westerners, LOL) and eat fast food over 10 times a week. No kidding.
Now they have these $5 pizzas now too...its sad that people think that's a bargain because they are so unhealthy. The crust is like white wonder bread soaked in grease.