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Mediterranean Diet Associated With Reduced Risk Of Depression

Date:
October 6, 2009
Source:
JAMA and Archives Journals
Summary:
Individuals who follow the Mediterranean dietary pattern -- rich in vegetables, fruits, nuts, whole grains and fish -- appear less likely to develop depression, according to a new report.
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Individuals who follow the Mediterranean dietary pattern—rich in vegetables, fruits, nuts, whole grains and fish—appear less likely to develop depression, according to a report in the October issue of Archives of General Psychiatry, one of the JAMA/Archives journals.

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The lifetime prevalence of mental disorders has been found to be lower in Mediterranean than Northern European countries, according to background information in the article. One plausible explanation is that the diet commonly followed in the region may be protective against depression. Previous research has suggested that the monounsaturated fatty acids in olive oil—used abundantly in the Mediterranean diet—may be associated with a lower risk of severe depressive symptoms.

Almudena Sánchez-Villegas, B.Pharm., Ph.D., of University of Las Palmas de Gran Canaria and Clinic of the University of Navarra, Pamplona, Spain, and colleagues studied 10,094 healthy Spanish participants who completed an initial questionnaire between 1999 and 2005. Participants reported their dietary intake on a food frequency questionnaire, and the researchers calculated their adherence to the Mediterranean diet based on nine components (high ratio of monounsaturated fatty acids to saturated fatty acids; moderate intake of alcohol and dairy products; low intake of meat; and high intake of legumes, fruit and nuts, cereals, vegetables and fish).

After a median (midpoint) of 4.4 years of follow-up, 480 new cases of depression were identified, including 156 in men and 324 in women. Individuals who followed the Mediterranean diet most closely had a greater than 30 percent reduction in the risk of depression than whose who had the lowest Mediterranean diet scores. The association did not change when the results were adjusted for other markers of a healthy lifestyle, including marital status and use of seatbelts.

"The specific mechanisms by which a better adherence to the Mediterranean dietary pattern could help to prevent the occurrence of depression are not well known," the authors write. Components of the diet may improve blood vessel function, fight inflammation, reduce risk for heart disease and repair oxygen-related cell damage, all of which may decrease the chances of developing depression.

"However, the role of the overall dietary pattern may be more important than the effect of single components. It is plausible that the synergistic combination of a sufficient provision of omega-three fatty acids together with other natural unsaturated fatty acids and antioxidants from olive oil and nuts, flavonoids and other phytochemicals from fruit and other plant foods and large amounts of natural folates and other B vitamins in the overall Mediterranean dietary pattern may exert a fair degree of protection against depression," the authors write.

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Materials provided by JAMA and Archives Journals. Note: Content may be edited for style and length.


Journal Reference:

  1. Almudena Sanchez-Villegas; Miguel Delgado-Rodriguez; Alvaro Alonso; Javier Schlatter; Francisca Lahortiga; Lluis Serra Majem; Miguel Angel Martinez-Gonzalez. Association of the Mediterranean Dietary Pattern With the Incidence of Depression: The Seguimiento Universidad de Navarra/University of Navarra Follow-up (SUN) Cohort. Arch Gen Psychiatry, 2009; 66 (10): 1090-1098 [abstract]

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JAMA and Archives Journals. "Mediterranean Diet Associated With Reduced Risk Of Depression." ScienceDaily. ScienceDaily, 6 October 2009. <www.sciencedaily.com/releases/2009/10/091005181623.htm>.
JAMA and Archives Journals. (2009, October 6). Mediterranean Diet Associated With Reduced Risk Of Depression. ScienceDaily. Retrieved December 3, 2022 from www.sciencedaily.com/releases/2009/10/091005181623.htm
JAMA and Archives Journals. "Mediterranean Diet Associated With Reduced Risk Of Depression." ScienceDaily. www.sciencedaily.com/releases/2009/10/091005181623.htm (accessed December 3, 2022).

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  • RELATED TERMS
    • Mediterranean diet
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