Editing Seasonal affective disorder (section)

===Nordic countries===
Winter depression is a common slump in the mood of some inhabitants of most of the [[Nordic countries]]. [[Iceland]], however, seems to be an exception. A study of more than 2000 people there found the prevalence of seasonal affective disorder and seasonal changes in anxiety and depression to be unexpectedly ''low'' in both sexes.<ref>{{cite journal | vauthors = Magnusson A, Axelsson J, Karlsson MM, Oskarsson H | title = Lack of seasonal mood change in the Icelandic population: results of a cross-sectional study | journal = The American Journal of Psychiatry | volume = 157 | issue = 2 | pages = 234–8 | date = February 2000 | pmid = 10671392 | doi = 10.1176/appi.ajp.157.2.234 | s2cid = 20441380 }}</ref> The study's authors suggested that propensity for SAD may differ due to some genetic factor within the Icelandic population. A study of Canadians of wholly Icelandic descent also showed low levels of SAD.<ref name="pmid8250680">{{cite journal | vauthors = Magnússon A, Axelsson J | title = The prevalence of seasonal affective disorder is low among descendants of Icelandic emigrants in Canada | journal = Archives of General Psychiatry | volume = 50 | issue = 12 | pages = 947–51 | date = December 1993 | pmid = 8250680 | doi = 10.1001/archpsyc.1993.01820240031004 }}</ref> It has more recently been suggested that this may be attributed to the large amount of fish traditionally eaten by Icelandic people. In 2007, about 90 kilograms of fish per person was consumed per year in Iceland, as opposed to about 24 kilograms in the US and Canada,<ref name=fao>[https://web.archive.org/web/20170519070616/ftp://ftp.fao.org/FI/CDrom/CD_yearbook_2008/root/food_balance/section2.pdf Fishery and Aquaculture Statistics: SECTION 2 – Food balance sheets and fish contribution to protein supply, by country from 1961 to 2007] . Rome: Food and Agriculture Organization of the United Nations (2008)</ref> rather than to genetic predisposition; a similar anomaly is noted in Japan, where annual fish consumption in recent years averages about 60 kilograms per capita.<ref>{{cite journal | vauthors = Cott J, Hibbeln JR | title = Lack of seasonal mood change in Icelanders | journal = The American Journal of Psychiatry | volume = 158 | issue = 2 | pages = 328 | date = February 2001 | pmid = 11156835 | doi = 10.1176/appi.ajp.158.2.328 }}</ref>  Fish are high in [[vitamin D]]. Fish also contain [[docosahexaenoic acid]] (DHA), which helps with a variety of neurological dysfunctions.<ref>{{cite journal | vauthors = Horrocks LA, Yeo YK | title = Health benefits of docosahexaenoic acid (DHA) | journal = Pharmacological Research | volume = 40 | issue = 3 | pages = 211–25 | date = September 1999 | pmid = 10479465 | doi = 10.1006/phrs.1999.0495 | citeseerx = 10.1.1.334.6891 }}</ref>{{dubious|date=November 2020}}