> Cutting yourself off from your friends and family is another.

This is exactly one of the reasons I think better education around food/diet/nutrition is important. You don't need to cut yourself off from enabler family/friends if they aren't enablers to begin with. It's cultural, too. The portion sizes at all the restaurants in a given region because "we like to eat big meals here", or whatever. There are sooo many factors and the underlying flaw, to me, is ignorance of "how this stuff works".