In our systematic reviews we focused largely not on individual barriers to behavioural change, but on social and community barriers to behavioural change, and quite often it's the people with the lower incomes who are facing the greatest barriers. For instance, young people are often not allowed out in the evening because of basic environmental things like poor street lighting. There's a great concern about safety when going out in the evening, and parents are quite often not allowing their children to go out. So if they're not in a position to drive them in a car, they'd rather their children stayed home.
On February 26th, 2007. See this statement in context.