“…For example, programs of physical exercise have shown to reduce psychotic symptoms (Beebe et al, 2005;Rimes et al, 2015;Scheewe et al, 2013), depressive symptoms (Acil et al, 2008;Scheewe et al, 2013), anxiety (Wipfli et al, 2008) and stress (Hoffmann et al, 2005) and improved quality of life was found after a nutritional intervention (Evans et al, 2005) and a psycho-educational weight control program (Mauri et al, 2008). However, symptomatic stability or unchanged quality of life were also reported (Ball et al, 2001;Brar et al, 2005;Forsberg et al, 2010;Heggelund et al, 2011;Kwon et al, 2006;Poulin et al, 2007;Wärdig et al, 2016). Drawing firm conclusions about the effect of lifestyle interventions on mental health is complicated due to small sample sizes (Acil et al, 2008;Ball et al, 2001;Beebe et al, 2005;Evans et al, 2004;Forsberg et al, 2010;Heggelund et al, 2011;Kwon et al, 2006;Mauri et al, 2008) or the lack of a control group (Daumit et al, 2011;Hoffmann et al, 2005;Richardson et al, 2005).…”