Background The adverse effects of loneliness and of poor perceived social support on
physical health and mortality are established, but no systematic synthesis is available of
their relationship with the outcomes of mental health problems over time. In this systematic
review, we aim to examine the evidence on whether loneliness and closely related concepts
predict poor outcomes among adults with mental health problems. Methods We searched six
databases and reference lists for longitudinal quantitative studies that examined the�…

Background: The adverse effects of loneliness and of poor perceived social support on
physical health and mortality are established, but no systematic synthesis is available of
their relationship with the outcomes of mental health problems over time. In this systematic
review, we aim to examine the evidence on whether loneliness and closely related concepts
predict poor outcomes among adults with mental health problems. Methods: We searched
six databases and reference lists for longitudinal quantitative studies that examined the�…