A research team from Arizona State University recently conducted a cross-sectional study to compare the mood of vegetarians who never eat fish with the mood of healthy omnivorous adults. (Nutr J. 2010;9:26. DOI:10.1186/1475-2891-9-26).
A total of 138 healthy Seventh Day Adventist adults residing in Arizona and California (64 vegetarians and 79 non-vegetarians) were enrolled in the study and completed a health history questionnaire, food frequency questionnaire and two psychometric tests, the Depression Anxiety Stress Scale and also the Profile of Mood States.
While it is known that fish serves as the most important dietary supply of the long-chain omega-3s eicosapentaenoic acid and docosahexaenoic acid, shown to be essential in supporting brain health, low intake of eicosapentaenoic acid and docosahexaenoic acid in vegetarians doesn’t adversely affect mood, according to the research.
Vegetarians had significantly lower mean intakes of eicosapentaenoic acid, docosahexaenoic acid and also the omega-6 arachidonic acid; they had higher intakes of the omega-3 alpha-linolenic acid and the omega-6 linoleic acid. Seed oils are the richest sources of α-linolenic acid, notably those of rapeseed (canola), soybeans, walnuts, flaxseed (Linseed oil), clary sage seeds, perilla, chia, and hemp.
However, the vegetarians reported significantly less negative emotion than omnivores in both psychometric tests. Mean total psychometric scores were positively related to the mean intakes of eicosapentaenoic acid, docosahexaenoic acid and arachidonic acid , and inversely related to alpha-linolenic acid and linolenic acid intake.
The study team noted there is the possibility that vegetarians may make smarter dietary choices and may generally be healthier and happier.
About the Author – Louise Infante is the author of vegetarianmenu.net, a personal hobby blog centered on vegetarian cooking tips to help individuals live better.

I’ve read an awful lot of thoroughly miserable material on the subject of becoming a vegetarian and the reasons behind it. The truth is that vegetarianism isn’t nearly as grim as it’s usually painted and the reasons for choosing a veggie lifestyle tend to be more common sense than anything else.