It was my biggest takeaway from living in an area even fatter than the average. Almost every fat person claims that they're fat because of the actual meals they're eating. And it can be true for overweight level fats. But once into the obese level, and most certainly planet, it's usually down to empty calories,. Just constantly inhaling crap that dissolves the second it hits their stomach.  And the other big constant with anyone who lives on junk food is that their sense of taste is so blown out that they can't appreciate proper cooking.