http://www.newsweek.com/scientists-loneliness-genetic-link-obesity-1010126

Loneliness is often thought of as a byproduct of life circumstances, but new research shows that this silent epidemic could be influenced by genetic variations that are also linked to obesity. This means that shedding some pounds might temper loneliness, researchers said.

Scientists at the University of Cambridge discovered a genetic link between being overweight and social isolation. The research that was published on Tuesday in the journal Nature Communications is the first to show a causal link between loneliness and obesity, and it could give medical practitioners insight into how to treat two the common conditions.