This is, so far as we are aware, the first published study that concentrates on anxiety levels in forensic inpatients after a long-term intervention with Atlantic salmon:
“Reduced Anxiety in Forensic Inpatients after a Long-Term Intervention with Atlantic Salmon,” Anita L. Hansen, Gina Olson, Lisbeth Dahl, David Thornton, Bjørn Grung, Ingvild E. Graff, Livar Frøyland, and Julian F. Thayer [pictured here], Nutrients, vol. 6, 2014, 5405-5418. (Thanks to Ivan Oransky for bringing this to our attention.) The authors, at the University of Bergen, Norway, Haukeland University Hospital, Bergen, Norway, Sand Ridge Secure Treatment Center, Mauston, Wisconsin, USA, Ohio State University, USA, and other institutions, report:
“The aim of the present study was to investigate the effects of Atlantic salmon consumption on underlying biological mechanisms associated with anxiety such as heart rate variability (HRV) and heart rate (HR) as well as a measure of self-reported anxiety…. The findings suggest that Atlantic salmon consumption may have an impact on mental health related variables such as underlying mechanisms playing a key role in emotion-regulation and state-anxiety.”
BONUS (probably unrelated): The Ig Nobel Prize-winning study “Neural correlates of interspecies perspective taking in the post-mortem Atlantic Salmon: An argument for multiple comparisons correction“