I've noticed that a lot of "nice" families that don't have MAJOR dysfunctions tend to show the few problems they do have through their overeating.  I grew up in a really abusive family, but no one was overweight.  We were too busy surviving to worry about stuffing our faces.  My husband on the other hand was raised in a very nice family.  His parents are nice people, and not particularly fat themselves, but they never learned to say no to their kids about anything.  My husband's brother is a giant beetus-guzzling ham.  What I've noticed is that because they rarely have issues come up between them, when they do have a problem with each other, they never address it.  They just make jokes and then his mom makes a ton of food and they gloss over uncomfortable things with gluttony.    My husband was always athletic as a kid but admits he would have been fat if he had been less active.  He is a total shitlord now but didn't become one until we had our son.  He quickly realize that his mother's "easy going" nature was actually hurting the family.  She's a nice lady and actually comes from an abusive family like I do, so I can sort of understand why she is so lax.  We have to keep a VERY close eye on what she feeds our son when she visits.  He has special needs and those include dietary issues and they seem to believe that if you just power through it and keep giving your kid the food they can't have that they will magically be able to eat it.  I haven't yet found a way to explain that a dairy allergy is NOT lactose intolerance and that my son will shit blood and be in agony if he has milk.    His mom is underweight actually.  It's so weird because she deprives herself but stuffs her kids.  It's sad really.