Interesting development - there's more to wellbeing than the absence of illbeing. I watched Nicholas Christakis's TED talk yesterday
http://www.ted.com/talks/lang/eng/nicholas_christakis_the_hidden_influence_of_social_networks.html & he showed how physical, psychological & behavioural health factors are affected by the social networks in which we're embedded. And through several degrees of separation. So if you happen to be in a happy, healthy, low BMI, non-smoking patch it can have a distinctly positive impact on your wellbeing.
It seems positive health is partly viral!