monotonous/lonely/isolated/culturally-dead lives. Your idea makes sense to me; I'm not sure whether or not it conflicts with my idea. We used different starting points/assumptions about our culture(s).
I guess what a person gets out of unhealthy food/eating habits depends on whether that person feels overwhelmed with life (your perspective) or dead (my perspective) to start with.
I'm not sure if this post makes sense. It's an interesting subject to think about though.