They both have additional issues which reflect major character flaws besides their obesity: my dad is a compulsive hoarder and my mom is an alcoholic. I've noticed more and more that obesity is usually part and parcel with some other major issue (like it is for my parents). They both did come from humble backgrounds, in fact both of them are immigrants to the states, but for some reason their success wasn't enough for them to just be "happy" and gluttony is just another one of their selfish behaviors.