<p>The loneliness often experienced by older people in our society has a negative effect on their physical health, according to researchers from Amsterdam UMC and the University of Glasgow. Emiel Hoogendijk, epidemiologist at Amsterdam Public Health, analysed research results from more than 130 studies and found that loneliness led to an increase in physical frailty, which in turn increases the risk of adverse health outcomes such as depression, falls and cognitive decline. These results are published today in The Lancet Healthy Longevity.</p>