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[Correspondence] Wellbeing interventions: no evidence they prevent mental illness

Nisha Mehta and colleagues’ critique1 of wellbeing interventions as a strategy for population prevention to mental health disorders was criticised by Sarah Stewart-Brown and colleagues (June 27, p 2576)2 who suggested that evidence does exist to support the Rose hypothesis—that with improvements to a population’s wellbeing the prevalence of mental disorders will decrease. The Rose hypothesis3 is well evidenced in other branches of health; in a population, most illness arising from a risk factor (eg, myocardial infarction), if it has a relatively normal distribution (eg, blood pressure), occur in people who are below the upper limit of the normal distribution, simply because of the large number of individuals in this range.