environmental causes how can choosing to take less exercise and choosing to eat fast food be considered an environmental cause only if people are not responsible for their own actions that obesity is a disease according to some in the rich west is so that drugs can be prescribed you cannot get a drug approved unless it is for a disease thirty years ago it wasn't a disease what's changed personal behaviour as the article says we eat more we eat more rubbish we exercise less doubtless there are environmental causes but what are they