In a survey of various loneliness research reports, the Campaign to End Loneliness found that half of all older people say the television is their main company. In other research reported by the Campaign, it was found that loneliness has an adverse effect on both physical and mental health, with lonely people being more at risk of high blood pressure, early onset of cognitive decline and dementia and depression. The point at which loneliness and mental health issues intersect is a particularly tricky one, and the relationship between them is causal for many people. Lonely young adults were more than twice as likely to have mental health problems such as anxiety and depression, and to have self-harmed or attempted suicide. Lonely millennials have twice the risk of developing mental health problems like depression and anxiety, compared with those who are connected to others.